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Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Items Included in Consolidated Statement of Financial Condition [Abstract]
Trade receivables	$ 134,646	$ 110,722
Fees earned, not billed	356,876	320,700
Other receivables	28,516	26,563
Gross receivables	520,038	457,985
Less: Allowance for doubtful accounts	(1,184)	(901)
Receivables, net	$ 518,854	$ 457,084

Marketable Securities (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
Marketable Securities (Narrative) (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Investments [Line Items]
Cash equivalents at fair value	$ 588,227,000		$ 588,227,000		$ 450,240,000
Net unrealized loss	11,111,000		11,111,000		9,294,000
Net unrealized gains (losses) income tax expense (benefit)	(3,319,000)		(3,319,000)		(2,777,000)
Available-for-sale securities, gross realized gains			0	$ 0
Mutual funds and equities, gross realized gains			63,000	226,000
Mutual funds and equities, gross realized loss			101,000	714,000
Other long-term investments	44,645,000		44,645,000		104,673,000
Securities owned	32,748,000		32,748,000		32,148,000
Available-for-sale debt securities
Schedule of Investments [Line Items]
Available-for-sale securities, gross realized losses			167,000	521,000
Investment Funds Sponsored by LSV
Schedule of Investments [Line Items]
Other long-term investments	6,838,000		6,838,000		$ 6,366,000
Unrealized gains (losses) on investments	$ 66,000	$ (380,000)	$ 472,000	$ (1,296,000)

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 17,618	$ 15,204
Unrecognized tax benefits that would affect effective tax rate	17,224	14,431
Interest and penalties on unrecognized benefits	1,916	$ 1,118
Settlement and Lapse of Statute
Income Tax Contingency [Line Items]
Unrecognized tax benefits within the next twelve months	$ 4,172

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net income	$ 115,661	$ 61,659	$ 341,527	$ 363,243

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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+ Details

Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Revenues	$ 476,759	$ 471,334	$ 1,434,935	$ 1,534,447
Expenses	337,290	330,751	1,017,577	1,015,382
Operating profit (loss)	139,469	140,583	417,358	519,065
Private Banks
Segment Reporting Information [Line Items]
Revenues	121,469	122,660	378,171	460,392
Expenses	113,105	116,661	343,442	359,676
Operating profit (loss)	8,364	5,999	34,729	100,716
Investment Advisors
Segment Reporting Information [Line Items]
Revenues	110,461	109,565	326,579	341,989
Expenses	64,280	61,150	192,004	189,045
Operating profit (loss)	46,181	48,415	134,575	152,944
Institutional Investors
Segment Reporting Information [Line Items]
Revenues	70,479	78,260	219,914	248,582
Expenses	39,953	42,149	126,337	131,432
Operating profit (loss)	30,526	36,111	93,577	117,150
Investment Managers
Segment Reporting Information [Line Items]
Revenues	169,293	156,015	495,318	468,842
Expenses	108,078	100,876	321,705	300,520
Operating profit (loss)	61,215	55,139	173,613	168,322
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues	5,057	4,834	14,953	14,642
Expenses	11,874	9,915	34,089	34,709
Operating profit (loss)	$ (6,817)	$ (5,081)	$ (19,136)	$ (20,067)

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

+ Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

+ Details

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 115,661	$ 61,659	$ 341,527	$ 363,243
Other comprehensive loss, net of tax:
Foreign currency translation adjustments	(8,502)	(17,909)	249	(37,090)
Unrealized loss on investments:
Unrealized losses during the period, net of income taxes of $624, $1,194, $581 and $3,303	(2,089)	(4,000)	(1,945)	(11,057)
Reclassification adjustment for losses realized in net income, net of income taxes of $(10), $(24), $(39) and $(120)	35	83	128	401
Total other comprehensive loss, net of tax	(10,556)	(21,826)	(1,568)	(47,746)
Comprehensive income	$ 105,105	$ 39,833	$ 339,959	$ 315,497

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 89,229	$ 100,566
Accrued employee benefits and other personnel	8,377	9,852
Accrued voluntary separation program	27,777	53,821
Accrued consulting, outsourcing and professional fees	32,928	37,009
Accrued sub-advisory, distribution and other asset management fees	50,346	52,916
Accrued dividend payable	389	58,051
Other accrued liabilities	40,826	47,148
Total accrued liabilities	$ 249,872	$ 359,363

Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in the carrying amount of the Company's goodwill by segment are as follows:


	Institutional Investors		Investment Managers		Investments in New Businesses		Total

Balance, December 31, 2022	$	47,108	$	56,992	$	11,499	$	115,599

Foreign currency translation adjustments	—		(2)		—		(2)
Balance, September 30, 2023	$	47,108	$	56,990	$	11,499	$	115,597

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

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+ Details

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Unrealized losses during period, taxes	$ 624	$ 1,194	$ 581	$ 3,303
Reclassification adjustment for losses realized in net income, taxes	$ (10)	$ (24)	$ (39)	$ (120)

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues:
Revenues	$ 476,759	$ 471,334	$ 1,434,935	$ 1,534,447
Expenses:
Subadvisory, distribution and other asset management costs	47,531	47,334	142,157	150,485
Software royalties and other information processing costs	8,095	6,909	23,784	21,863
Compensation, benefits and other personnel	180,470	227,127	529,591	545,532
Stock-based compensation	7,979	10,766	23,458	31,339
Consulting, outsourcing and professional fees	54,203	58,558	176,619	184,320
Data processing and computer related	34,016	30,950	102,301	93,020
Facilities, supplies and other costs	16,999	19,704	58,825	57,464
Amortization	9,797	10,382	28,851	43,777
Depreciation	9,197	8,558	26,509	24,942
Total expenses	368,287	420,288	1,112,095	1,152,742
Income from operations	108,472	51,046	322,840	381,705
Net (loss) gain from investments	(206)	(1,406)	1,053	(4,515)
Interest and dividend income	11,125	3,962	29,453	6,663
Interest expense	(116)	(143)	(396)	(604)
Equity in earnings of unconsolidated affiliate	29,927	26,654	91,517	88,926
Income before income taxes	149,202	80,113	444,467	472,175
Income taxes	33,541	18,454	102,940	108,932
Net income	$ 115,661	$ 61,659	$ 341,527	$ 363,243
Basic earnings per common share (in USD per share)	$ 0.87	$ 0.46	$ 2.57	$ 2.66
Shares used to compute basic earnings per share (in shares)	132,231	135,203	133,035	136,524
Diluted earnings per common share (in USD per share)	$ 0.87	$ 0.45	$ 2.54	$ 2.63
Shares used to compute diluted earnings per share (in shares)	133,504	136,345	134,250	137,958
Dividends declared per common share (in USD per share)	$ 0	$ 0	$ 0.43	$ 0.40
Asset management, administration and distribution fees
Revenues:
Revenues	$ 380,594	$ 372,133	$ 1,131,244	$ 1,148,824
Information processing and software servicing fees
Revenues:
Revenues	$ 96,165	$ 99,201	$ 303,691	$ 385,623

Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Capital In Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2021		138,449
Beginning balance at Dec. 31, 2021	$ 1,860,763	$ 1,384	$ 1,246,608	$ 632,614	$ (19,843)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	363,243			363,243
Other comprehensive loss	(47,746)				(47,746)
Purchase and retirement of common stock (in shares)		(4,573)
Purchase and retirement of common stock	(258,817)	$ (46)	(28,622)	(230,149)
Issuance of common stock under employee stock purchase plan (in shares)		69
Issuance of common stock under employee stock purchase plan	3,381	$ 1	3,380
Issuance of common stock under share-based award plans (in shares)		871
Issuance of common stock under share-based award plans	32,528	$ 9	32,519
Stock-based compensation	31,339		31,339
Dividends declared	(54,378)			(54,378)
Ending balance (in shares) at Sep. 30, 2022		134,816
Ending balance at Sep. 30, 2022	1,930,313	$ 1,348	1,285,224	711,330	(67,589)
Beginning balance (in shares) at Jun. 30, 2022		135,480
Beginning balance at Jun. 30, 2022	1,922,088	$ 1,355	1,272,971	693,525	(45,763)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	61,659			61,659
Other comprehensive loss	(21,826)				(21,826)
Purchase and retirement of common stock (in shares)		(890)
Purchase and retirement of common stock	(49,434)	$ (9)	(5,571)	(43,854)
Issuance of common stock under employee stock purchase plan (in shares)		24
Issuance of common stock under employee stock purchase plan	1,123	$ 0	1,123
Issuance of common stock under share-based award plans (in shares)		202
Issuance of common stock under share-based award plans	5,937	$ 2	5,935
Stock-based compensation	10,766		10,766
Ending balance (in shares) at Sep. 30, 2022		134,816
Ending balance at Sep. 30, 2022	$ 1,930,313	$ 1,348	1,285,224	711,330	(67,589)
Beginning balance (in shares) at Dec. 31, 2022	134,162	134,162
Beginning balance at Dec. 31, 2022	$ 1,953,824	$ 1,342	1,307,162	694,287	(48,967)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	341,527			341,527
Other comprehensive loss	(1,568)				(1,568)
Purchase and retirement of common stock (in shares)		(4,050)
Purchase and retirement of common stock	(241,848)	$ (41)	(26,800)	(215,007)
Issuance of common stock under employee stock purchase plan (in shares)		65
Issuance of common stock under employee stock purchase plan	3,317	$ 1	3,316
Issuance of common stock under share-based award plans (in shares)		1,394
Issuance of common stock under share-based award plans	62,343	$ 14	62,329
Stock-based compensation	23,458		23,458
Dividends declared	(57,177)			(57,177)
Other	$ 5			5
Ending balance (in shares) at Sep. 30, 2023	131,571	131,571
Ending balance at Sep. 30, 2023	$ 2,083,881	$ 1,316	1,369,465	763,635	(50,535)
Beginning balance (in shares) at Jun. 30, 2023		132,230
Beginning balance at Jun. 30, 2023	2,023,553	$ 1,322	1,337,538	724,672	(39,979)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	115,661			115,661
Other comprehensive loss	(10,556)				(10,556)
Purchase and retirement of common stock (in shares)		(1,399)
Purchase and retirement of common stock	(85,979)	$ (14)	(9,262)	(76,703)
Issuance of common stock under employee stock purchase plan (in shares)		20
Issuance of common stock under employee stock purchase plan	1,073	$ 1	1,072
Issuance of common stock under share-based award plans (in shares)		720
Issuance of common stock under share-based award plans	32,145	$ 7	32,138
Stock-based compensation	7,979		7,979
Other	$ 5			5
Ending balance (in shares) at Sep. 30, 2023	131,571	131,571
Ending balance at Sep. 30, 2023	$ 2,083,881	$ 1,316	$ 1,369,465	$ 763,635	$ (50,535)

Business Acquisition (Details) - XPS Pensions (Nexus) Limited € in Thousands	Jul. 13, 2023 EUR (€)
Business Acquisition [Line Items]
Business combination, consideration transferred	€ 42,500
Payments to acquire business	35,000
Business combination, contingent consideration, liability	€ 7,500
Contingent consideration, earning period	2 years

Income Taxes (Interest And Penalties) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 17,618	$ 15,204
Interest and penalties on unrecognized benefits	1,916	1,118
Total gross uncertain tax positions	19,534	16,322
Amount included in Current liabilities	4,172	4,065
Amount included in Other long-term liabilities	15,362	12,257
Total gross uncertain tax positions	$ 19,534	$ 16,322

Shareholders' Equity

9 Months Ended

Sep. 30, 2023

Stockholders' Equity Note [Abstract]

Shareholders' Equity

Shareholders’ Equity

Stock-Based Compensation

The Company has non-qualified stock options and restricted stock units outstanding under its equity compensation plans. The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three and nine months ended September 30, 2023 and 2022, respectively, as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Stock-based compensation expense	$	7,979	$	10,766	$	23,458	$	31,339
Less: Deferred tax benefit	(1,438)		(1,917)		(4,278)		(5,851)
Stock-based compensation expense, net of tax	$	6,541	$	8,849	$	19,180	$	25,488

All outstanding stock options have performance-based vesting provisions specific to each option grant that tie the vesting of the applicable stock options to the Company’s financial performance. The Company’s stock options vest at a rate of 50% when a specified financial vesting target is achieved, and the remaining 50% when a second, higher specified financial vesting target is achieved. Options vest as a result of achievement of the financial vesting targets. Options granted in December 2017 and thereafter include a service condition which requires a minimum two or four year waiting period from the grant date along with the attainment of the applicable financial vesting target. The targets are measured annually on December 31. The amount of stock-based compensation expense recognized in the period is based upon management’s estimate of when the financial vesting targets may be achieved. Any change in management’s estimate could result in the remaining amount of stock-based compensation expense to be accelerated, spread out over a longer period, or reversed. This may cause volatility in the recognition of stock-based compensation expense in future periods and could materially affect the Company’s earnings.

The Company revised its estimate of when some vesting targets are expected to be achieved. This change in management's estimate resulted in a decrease of $4,859 in stock-based compensation expense during the nine months ended September 30, 2023.

As of September 30, 2023, there was approximately $90,469 of unrecognized compensation cost remaining related to unvested employee stock options and restricted stock units that management expects will vest and is being amortized.

The Company issues new common shares associated with the exercise of stock options. The total intrinsic value of options exercised during the nine months ended September 30, 2023 was $22,444. The total options exercisable as of September 30, 2023 had an intrinsic value of $60,297. The total intrinsic value for options exercisable is calculated as the difference between the market value of the Company’s common stock as of September 30, 2023 and the weighted average exercise price of the options. The market value of the Company’s common stock as of September 30, 2023 was $60.23 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of September 30, 2023 was $53.90. Total options that were outstanding as of September 30, 2023 were 16,445,000. Total options that were exercisable as of September 30, 2023 were 7,581,000.

Common Stock Buyback

The Company’s Board of Directors, under multiple authorizations, has authorized the repurchase of common stock on the open market or through private transactions. The Company purchased 4,050,000 shares at a total cost of $241,848 during the nine months ended September 30, 2023, which reduced the total shares outstanding of common stock. The cost of stock purchases during the period includes the cost of excise taxes applicable to stock repurchases and certain transactions that settled in the following quarter. On April 18, 2023, the Company's Board of Directors approved an increase in the stock repurchase program by an additional $250,000. As of September 30, 2023, the Company had approximately $101,005 of authorization remaining for the purchase of common stock under the program.

The Company immediately retires its common stock when purchased. Upon retirement, the Company reduces Capital in excess of par value for the average capital per share outstanding and the remainder is charged against Retained earnings. If the Company reduces its Retained earnings to zero, any subsequent purchases of common stock will be charged entirely to Capital in excess of par value.

Cash Dividend

On May 31, 2023, the Board of Directors declared a cash dividend of $0.43 per share on the Company's common stock, which was paid on June 21, 2023, to shareholders of record on June 12, 2023. Cash dividends declared during the nine months ended September 30, 2023 and 2022 were $57,177 and $54,378, respectively.

- Definition

The entire disclosure for equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Composition of Certain Financial Statement Captions (Deferred Contract Costs) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Items Included in Consolidated Statement of Financial Condition [Abstract]
Deferred contract costs	$ 38,518,000		$ 38,518,000		$ 37,928,000
Capitalized contract cost, amount capitalized during period	$ 2,243,000	$ 4,648,000	7,212,000	$ 9,710,000
Amortization of deferred contract costs			6,622,000	8,156,000
Accelerated amortization of deferred contract costs				$ 1,784,000
Capitalized contract cost impairment			$ 0

Composition of Certain Financial Statement Captions

9 Months Ended

Sep. 30, 2023

Items Included in Consolidated Statement of Financial Condition [Abstract]

Composition of Certain Financial Statement Captions

Receivables

Receivables on the accompanying Consolidated Balance Sheets consist of:


	September 30, 2023		December 31, 2022
Trade receivables	$	134,646	$	110,722
Fees earned, not billed	356,876		320,700
Other receivables	28,516		26,563
	520,038		457,985
Less: Allowance for doubtful accounts	(1,184)		(901)
	$	518,854	$	457,084

Fees earned, not billed represents receivables from contracts with customers earned but unbilled and results from timing differences between services provided and contractual billing schedules. These billing schedules generally provide for fees to be billed on a quarterly basis. In addition, certain fees earned from investment operations services are calculated based on assets under administration that have an extended valuation process. Billings to these clients occur once the asset valuation processes are completed.

Receivables from investment products on the accompanying Consolidated Balance Sheets primarily represent fees receivable for distribution, investment advisory, and administration services to various regulated investment companies and other investment products sponsored by SEI.

Property and Equipment

Property and Equipment on the accompanying Consolidated Balance Sheets consists of:


	September 30, 2023		December 31, 2022
Buildings	$	216,572	$	210,626
Equipment	192,187		179,318
Land	26,450		26,439
Purchased software	164,844		160,714
Furniture and fixtures	22,580		21,956
Leasehold improvements	19,602		20,879
Construction in progress	583		1,958
	642,818		621,890
Less: Accumulated depreciation	(465,297)		(440,861)
Property and Equipment, net	$	177,521	$	181,029

The Company recognized $26,509 and $24,942 in depreciation expense related to property and equipment for the nine months ended September 30, 2023 and 2022, respectively.

Deferred Contract Costs

Deferred contract costs, which primarily consist of deferred sales commissions, were $38,518 and $37,928 as of September 30, 2023 and December 31, 2022, respectively. The Company deferred expenses related to contract costs of $2,243 and $4,648 during the three months ended September 30, 2023 and 2022, respectively. During the nine months ended September 30, 2023 and 2022, the Company deferred expenses related to contract costs of $7,212 and $9,710, respectively. Amortization expense related to deferred contract costs were $6,622 and $8,156 during the nine months ended September 30, 2023 and 2022, respectively. Amortization expense during the nine months ended September 30, 2022 includes $1,784 in expense accelerated as a result of the termination of a contractual agreement with a significant client (See Note 13). Amortization expense related to deferred contract costs is included in Compensation, benefits and other personnel on the accompanying Consolidated Statements of Operations. There were no material impairment losses in relation to deferred contract costs during the nine months ended September 30, 2023.

Accrued Liabilities

Accrued liabilities on the accompanying Consolidated Balance Sheets consist of:


	September 30, 2023		December 31, 2022
Accrued employee compensation	$	89,229	$	100,566
Accrued employee benefits and other personnel	8,377		9,852
Accrued voluntary separation program	27,777		53,821
Accrued consulting, outsourcing and professional fees	32,928		37,009
Accrued sub-advisory, distribution and other asset management fees	50,346		52,916

Accrued dividend payable	389		58,051

Other accrued liabilities	40,826		47,148
Total accrued liabilities	$	249,872	$	359,363

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Schedule of Fair Value Of Certain Financial Assets And Liabilities

The fair value of certain financial assets of the Company was determined using the following inputs:


			Fair Value Measurements at the End of the Reporting Period Using
Assets	September 30, 2023		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Equity securities	$	10,626	$	10,626	$	—
Available-for-sale debt securities	108,936		—		108,936
Fixed-income securities owned	32,748		—		32,748
Investment funds sponsored by LSV (1)	6,838
	$	159,148	$	10,626	$	141,684


			Fair Value Measurements at the End of the Reporting Period Using
Assets	December 31, 2022		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Equity securities	$	10,900	$	10,900	$	—
Available-for-sale debt securities	117,301		—		117,301
Fixed-income securities owned	32,148		—		32,148
Investment funds sponsored by LSV (1)	6,366
	$	166,715	$	10,900	$	149,449

(1) The fair value amounts presented in the tables above are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the accompanying Consolidated Balance Sheets (See Note 5).

Investment in Unconsolidated Affiliate (Condensed Balance Sheets of LSV) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Current assets	$ 1,519,390	$ 1,453,308
Total Assets	2,397,236	2,383,553
Current liabilities	282,052	397,883
Total Liabilities and Shareholders' Equity	2,397,236	2,383,553
Equity Method Investment, Nonconsolidated Investee
Schedule of Equity Method Investments [Line Items]
Current assets	121,830	158,326
Non-current assets	6,662	6,019
Total Assets	128,492	164,345
Current liabilities	64,273	77,306
Non-current liabilities	2,405	3,050
Partners’ capital	61,814	83,989
Total Liabilities and Shareholders' Equity	$ 128,492	$ 164,345

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481404/852-10-50-7

Reference 19: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481404/852-10-50-7

Reference 20: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(23))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 21: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 22: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 23: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 201.5-02(26))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Cover page - shares	9 Months Ended
Cover page - shares	Sep. 30, 2023	Oct. 12, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	0-10200
Entity Registrant Name	SEI INVESTMENTS COMPANY
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	23-1707341
Entity Address, Address Line One	1 Freedom Valley Drive
Entity Address, City or Town	Oaks
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19456
City Area Code	610
Local Phone Number	676-1000
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	SEIC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		131,587,693
Entity Central Index Key	0000350894
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false
Current Fiscal Year End Date	--12-31

Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available for sale and equity securities, cost	$ 133,811	$ 140,605
Available for sale and equity securities, gross unrealized gains	224	0
Available for sale and equity securities, gross unrealized (losses)	(14,473)	(12,404)
Available for sale and equity securities, fair value	119,562	128,201
Available-for-sale debt securities
Debt Securities, Available-for-sale [Line Items]
Available for sale debt securities, cost	123,366	129,372
Available for sale debt securities, gross unrealized gains	0	0
Available for sale debt securities, gross unrealized (losses)	(14,430)	(12,071)
Available for sale debt securities, fair value	108,936	117,301
SEI-sponsored mutual funds
Debt Securities, Available-for-sale [Line Items]
Equity securities, FV-NI, cost	5,412	6,207
Equity securities, FV-NI, gross unrealized gains	37	0
Equity securities, FV-NI, gross unrealized (losses)	(43)	(176)
Equity securities, FV-NI, fair value	5,406	6,031
Equities and other mutual funds
Debt Securities, Available-for-sale [Line Items]
Equity securities, FV-NI, cost	5,033	5,026
Equity securities, FV-NI, gross unrealized gains	187	0
Equity securities, FV-NI, gross unrealized (losses)	0	(157)
Equity securities, FV-NI, fair value	$ 5,220	$ 4,869

Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-income securities owned	$ 32,748	$ 32,148
Assets, fair value	159,148	166,715
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-income securities owned	0	0
Assets, fair value	10,626	10,900
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-income securities owned	32,748	32,148
Assets, fair value	141,684	149,449
Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	10,626	10,900
Equity securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	10,626	10,900
Equity securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	0	0
Available-for-sale debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	108,936	117,301
Available-for-sale debt securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	0	0
Available-for-sale debt securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	108,936	117,301
Investment Funds sponsored by LSV
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds sponsored by LSV	$ 6,838	$ 6,366

Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2023

Stockholders' Equity Note [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three and nine months ended September 30, 2023 and 2022, respectively, as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Stock-based compensation expense	$	7,979	$	10,766	$	23,458	$	31,339
Less: Deferred tax benefit	(1,438)		(1,917)		(4,278)		(5,851)
Stock-based compensation expense, net of tax	$	6,541	$	8,849	$	19,180	$	25,488

Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accounting Policies [Abstract]
Net income	$ 115,661	$ 61,659	$ 341,527	$ 363,243
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	9,197	8,558	26,509	24,942
Amortization	9,797	10,382	28,851	43,777
Equity in earnings of unconsolidated affiliate	(29,927)	(26,654)	(91,517)	(88,926)
Distributions received from unconsolidated affiliate			100,252	103,504
Stock-based compensation	7,979	10,766	23,458	31,339
Provision for losses on receivables			283	734
Deferred income tax expense			(20,971)	(41,419)
Net (gain) loss from investments	$ 206	$ 1,406	(1,053)	4,515
Change in other long-term liabilities			3,105	3,014
Change in other assets			1,099	(4,820)
Contract costs capitalized, net of amortization			(590)	(1,554)
Other			2,122	(6,934)
Change in current assets and liabilities (Increase) decrease in
Receivables from investment products			6,327	(32,187)
Receivables			(62,053)	(41,697)
Other current assets			(8,654)	(11,422)
Advances due from unconsolidated affiliate			51,293	54,328
(Decrease) increase in
Accounts payable			(3,085)	(2,103)
Accrued liabilities			(48,128)	27,092
Deferred revenue			(2,793)	3,093
Total adjustments			4,455	65,276
Net cash provided by operating activities			$ 345,982	$ 428,519

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Summary of Significant Accounting Policies [Line Items]
Cash and cash equivalents invested in SEI-sponsored money market funds	$ 854,443		$ 854,443		$ 853,008
Restricted cash	301		301		351
Net book value of capitalized software	$ 244,416		$ 244,416		237,302
Anti-dilutive employee stock options (in shares)	10,869	11,862	11,049	12,048
Anti-dilutive employee stock options (in USD per share)	$ 61.31	$ 60.26	$ 61.29	$ 60.27
Investment Managers
Summary of Significant Accounting Policies [Line Items]
Capitalized software development costs			$ 12,878
Capitalized software development costs in-progress			22,522		9,558
SEI Wealth Platform
Summary of Significant Accounting Policies [Line Items]
Capitalized software development costs			13,706	$ 19,543
Net book value of capitalized software	$ 220,654		220,654
Capitalized software in progress	$ 1,439		1,439		14,217
Amortization expense related to the SEI Wealth Platform			$ 19,027	29,696
SEI Wealth Platform \| Weighted Average
Summary of Significant Accounting Policies [Line Items]
Estimated useful life of the SEI Wealth Platform	9 years 2 months 12 days		9 years 2 months 12 days
SEI-Sponsored Open-Ended Money Market Mutual Funds
Summary of Significant Accounting Policies [Line Items]
Cash and cash equivalents invested in SEI-sponsored money market funds	$ 424,891		$ 424,891		305,434
SEI Investments (Europe) Limited
Summary of Significant Accounting Policies [Line Items]
Restricted cash	250		250		250
SEI Investments Distribution Co. (SIDCO)
Summary of Significant Accounting Policies [Line Items]
Restricted cash	50		50		$ 101
SEI-Sponsored Open-Ended Money Market Mutual Funds
Summary of Significant Accounting Policies [Line Items]
Fees waived	$ 5,519	$ 7,896	$ 16,400	$ 28,120

Revenues from Contracts with Customers

9 Months Ended

Sep. 30, 2023

Revenue from Contract with Customer [Abstract]

Revenues from Contracts with Customers

Revenues from Contracts with CustomersThe Company’s principal sources of revenues are: (1) asset management, administration and distribution fees primarily earned based upon a contractual percentage of net assets under management or administration; and (2) information processing and software servicing fees that are either recurring and primarily earned based upon the number of trust accounts being serviced or a percentage of the market value of the clients' assets processed on the Company's platforms, or non-recurring and based upon project-oriented contractual agreements related to client implementations.

Disaggregation of Revenue

The following tables provide additional information pertaining to our revenues disaggregated by major product line and primary geographic market based on the location of the use of the products or services for each of the business segments for the three months ended September 30, 2023 and 2022:


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
Major Product Lines:	For the Three Months Ended September 30, 2023
Investment management fees from pooled investment products	$	32,119	$	60,046	$	11,858	$	87	$	351	$	104,461
Investment management fees from investment management agreements	900		45,175		54,317		—		4,240		104,632
Investment operations fees	336		2		—		156,717		—		157,055
Investment processing fees - PaaS	60,564		1,183		50		86		13		61,896
Investment processing fees - SaaS	21,972		—		2,291		4,269		—		28,532
Professional services fees	4,539		—		—		370		—		4,909
Account fees and other	1,039		4,055		1,963		7,764		453		15,274
Total revenues	$	121,469	$	110,461	$	70,479	$	169,293	$	5,057	$	476,759

Primary Geographic Markets:
United States	$	78,306	$	110,461	$	58,992	$	153,368	$	5,057	$	406,184
United Kingdom	28,789		—		8,442		—		—		37,231
Canada	10,060		—		1,431		—		—		11,491
Ireland	4,314		—		1,614		9,711		—		15,639
Luxembourg	—		—		—		6,214		—		6,214

Total revenues	$	121,469	$	110,461	$	70,479	$	169,293	$	5,057	$	476,759


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
Major Product Lines:	For the Three Months Ended September 30, 2022
Investment management fees from pooled investment products	$	30,002	$	63,688	$	12,928	$	81	$	367	$	107,066
Investment management fees from investment management agreements	633		39,915		60,887		—		3,992		105,427
Investment operations fees	336		—		—		144,181		—		144,517
Investment processing fees - PaaS	57,818		—		—		—		—		57,818
Investment processing fees - SaaS	29,855		—		2,650		3,963		—		36,468
Professional services fees	3,195		—		—		798		—		3,993
Account fees and other	821		5,962		1,795		6,992		475		16,045
Total revenues	$	122,660	$	109,565	$	78,260	$	156,015	$	4,834	$	471,334

Primary Geographic Markets:
United States	$	81,628	$	109,565	$	65,571	$	141,928	$	4,834	$	403,526
United Kingdom	27,186		—		9,729		—		—		36,915
Canada	10,495		—		1,357		—		—		11,852
Ireland	3,351		—		1,570		9,580		—		14,501
Luxembourg	—				—		4,507				4,507
Other	—		—		33		—		—		33
Total revenues	$	122,660	$	109,565	$	78,260	$	156,015	$	4,834	$	471,334

The following tables provide additional information pertaining to our revenues disaggregated by major product line and primary geographic market based on the location of the use of the products or services for each of the Company’s business segments for the nine months ended September 30, 2023 and 2022:


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
Major Product Lines:	For the Nine Months Ended September 30, 2023
Investment management fees from pooled investment products	$	96,432	$	181,754	$	36,295	$	318	$	1,041	$	315,840
Investment management fees from investment management agreements	2,210		129,000		169,875		—		12,479		313,564
Investment operations fees	1,019		—		—		456,624		—		457,643
Investment processing fees - PaaS	185,320		3,479		330		160		33		189,322
Investment processing fees - SaaS	66,913		—		7,733		12,686		—		87,332
Professional services fees (1)	23,213		—		—		2,613		—		25,826
Account fees and other	3,064		12,346		5,681		22,917		1,400		45,408
Total revenues	$	378,171	$	326,579	$	219,914	$	495,318	$	14,953	$	1,434,935

Primary Geographic Markets:
United States	$	249,759	$	326,579	$	184,332	$	450,173	$	14,953	$	1,225,796
United Kingdom	84,619		—		26,221		—		—		110,840
Canada	30,297		—		4,247		—		—		34,544
Ireland	13,496		—		5,114		27,714		—		46,324
Luxembourg	—		—		—		17,431		—		17,431

Total revenues	$	378,171	$	326,579	$	219,914	$	495,318	$	14,953	$	1,434,935

(1) Professional services fees of the Private Banks segment includes a one-time early contractual buyout fee of $10,457 recorded during the nine months ended September 30, 2023 from an investment processing client acquired by an existing client.


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
Major Product Lines:	For the Nine Months Ended September 30, 2022
Investment management fees from pooled investment products	$	95,113	$	203,171	$	42,494	$	288	$	1,136	$	342,202
Investment management fees from investment management agreements	1,504		122,321		192,559		—		12,191		328,575
Investment operations fees	1,040		—		—		434,302		—		435,342
Investment processing fees - PaaS	170,651		—		—		—		—		170,651
Investment processing fees - SaaS	89,259		—		8,781		11,532		—		109,572
Professional services fees (2)	100,020		—		—		1,822		—		101,842
Account fees and other	2,805		16,497		4,748		20,898		1,315		46,263
Total revenues	$	460,392	$	341,989	$	248,582	$	468,842	$	14,642	$	1,534,447

Primary Geographic Markets:
United States	$	244,472	$	341,989	$	204,836	$	428,303	$	14,642	$	1,234,242
United Kingdom	171,042		—		33,761		—		—		204,803
Canada	33,318		—		4,023		—		—		37,341
Ireland	11,560		—		5,700		28,818		—		46,078
Luxembourg	—				—		11,721				11,721
Other	—		—		262		—		—		262
Total revenues	$	460,392	$	341,989	$	248,582	$	468,842	$	14,642	$	1,534,447

(2) Professional services fees of the Private Banks segment includes one-time early termination fees of $88,000 related to a contractual agreement with a significant client of the Company. In accordance with Accounting Standards Codification 606, the entire amount of the fees received were recorded during the three months ended March 31, 2022 as there were no future performance obligations of the Company related to the agreement upon termination.

Investment management fees from pooled investment products - Revenues associated with clients' assets invested in Company-sponsored pooled investment products. Contractual fees are stated as a percentage of the market value of assets under management and collected on a monthly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Investment management fees from investment management agreements - Revenues based on assets of clients of the Institutional Investors segment primarily invested in Company-sponsored products. Each client is charged an investment management fee that is stated as a percentage of the market value of all assets under management. The client is billed directly on a quarterly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Revenues associated with the separately managed account program offered through registered investment advisors located throughout the United States. The contractual fee is stated as a percentage of the market value of all assets invested in the separately managed account and collected on a quarterly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Investment operations fees - Revenues earned from accounting and administrative services, distribution support services and regulatory and compliance services to investment management firms and family offices. The Company contracts directly with the investment management firm or family office. The contractual fees are stated as a percentage of net assets under administration and billed when asset valuations are finalized. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Investment processing fees - Platform as a Service - Revenues associated with clients that outsource their entire investment operation and back-office processing functions. Through the use of the Company's proprietary platforms, the Company assumes all back-office investment processing services including investment processing, custody and safekeeping of assets, income collections, securities settlement and other related trust activities. The contractual fee is

based on a monthly fee plus additional fees determined on a per-account or per-transaction basis. Contractual fees can also be stated as a percentage of the value of assets processed on the Company's platforms each month as long as the fee is in excess of a monthly contractual minimum. The client is billed directly on a monthly basis. Revenues are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations.

Investment processing fees - Software as a Service - Revenues associated with clients of the Private Banks segment for application software services. Clients retain responsibility for all investment operations, client administration and other back-office trust operations. The contractual fee is based on a monthly fee plus additional fees determined on a per-account or per-transaction basis. The client is billed directly on a monthly basis.

Revenues associated with clients of the Investment Managers segment processed on the Archway PlatformSM are fees for hosted technology services to family offices and financial institutions. The Archway Platform is an integrated technology platform used for investment, operations, accounting and client reporting by these institutions. The contractual fee is based on a monthly subscription fee to access the Archway Platform along with additional fees on a per transaction basis.

Revenues associated with clients of the Institutional Investors segment processed on the SEI NovusSM portfolio intelligence tool are fees for data management, performance measurement, reporting, and risk analytics. The contractual fee is based on a fixed fee to access SEI Novus and includes fees for integration of historical fund data and custom reporting.

All revenues from investment processing fees are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations.

Professional services fees - Revenues associated with the business services migration for investment processing clients of the Private Banks segment and investment operations clients of the Investment Managers segment. In addition, Professional services include other services such as business transformation consulting. Typically fees are stated as a contractual fixed fee. The client is billed directly and fees are collected according to the terms of the agreement.

Account fees and other - Revenues associated with custody account servicing, account terminations, reimbursements received for out-of-pocket expenses, and other fees for the provision of ancillary services.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-10

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-15

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-13

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org//606/tableOfContent

+ Details

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Goodwill and Intangible Assets (Schedule of Goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 115,599
Foreign currency translation adjustments	(2)
Goodwill, ending balance	115,597
Institutional Investors
Goodwill [Roll Forward]
Goodwill, beginning balance	47,108
Foreign currency translation adjustments	0
Goodwill, ending balance	47,108
Investment Managers
Goodwill [Roll Forward]
Goodwill, beginning balance	56,992
Foreign currency translation adjustments	(2)
Goodwill, ending balance	56,990
Investments In New Businesses
Goodwill [Roll Forward]
Goodwill, beginning balance	11,499
Foreign currency translation adjustments	0
Goodwill, ending balance	$ 11,499

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References + Details

Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares		3 Months Ended		9 Months Ended
	May 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Stockholders' Equity [Abstract]
Dividends declared (in USD per share)	$ 0.43	$ 0	$ 0	$ 0.43	$ 0.40

Line of Credit (Details) - 2021 Credit Facility	Apr. 23, 2021 USD ($) fiscalQuarter	Oct. 12, 2023 USD ($)
Line of Credit Facility [Line Items]
Debt interest rate accrual term, number of preceding fiscal quarters \| fiscalQuarter	4
Subsequent Event
Line of Credit Facility [Line Items]
Letters of credit outstanding amount		$ 4,866,000
Line of Credit
Line of Credit Facility [Line Items]
Credit facility term of agreement	5 years
Credit facility maximum borrowing capacity	$ 325,000,000
Credit facility accordion feature, increase limit	$ 100,000,000
Line of Credit \| Subsequent Event
Line of Credit Facility [Line Items]
Credit facility remaining borrowing capacity		$ 320,134,000
Line of Credit \| LIBOR
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.00%
Line of Credit \| Federal Funds Rate
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	0.50%
Line of Credit \| Minimum
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion	0.15%
Line of Credit \| Minimum \| Lender's Base Rate Plus Market Spread
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	0.25%
Line of Credit \| Minimum \| LIBOR
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.25%
Line of Credit \| Maximum
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion	0.30%
Line of Credit \| Maximum \| Lender's Base Rate Plus Market Spread
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.00%
Line of Credit \| Maximum \| LIBOR
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	2.00%
Letter of Credit
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	$ 15,000,000
Credit facility, commitment fee percentage	1.25%
Credit facility, fronting fee percentage	0.20%

Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2023

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax

The components of Accumulated other comprehensive loss, net of tax, are as follows:


	Foreign Currency Translation Adjustments		Unrealized Gains (Losses) on Investments		Accumulated Other Comprehensive Loss
Balance, January 1, 2023	$	(39,673)	$	(9,294)	$	(48,967)

Other comprehensive loss before reclassifications	249		(1,945)		(1,696)
Amounts reclassified from accumulated other comprehensive loss	—		128		128
Net current-period other comprehensive loss	249		(1,817)		(1,568)

Balance, September 30, 2023	$	(39,424)	$	(11,111)	$	(50,535)

Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accounting Policies [Abstract]
Net income	$ 115,661	$ 61,659	$ 341,527	$ 363,243
Shares used to compute basic earnings per common share (in shares)	132,231	135,203	133,035	136,524
Dilutive effect of stock options (in shares)	1,273	1,142	1,215	1,434
Shares used to compute diluted earnings per common share (in shares)	133,504	136,345	134,250	137,958
Basic earnings per common share (in USD per share)	$ 0.87	$ 0.46	$ 2.57	$ 2.66
Diluted earnings per common share (in USD per share)	$ 0.87	$ 0.45	$ 2.54	$ 2.63

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2023

Marketable Securities [Abstract]

Schedule of Available For Sale and Equity Securities

Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of:


	At September 30, 2023
	Cost Amount		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
Available-for-sale debt securities	$	123,366	$	—	$	(14,430)	$	108,936
SEI-sponsored mutual funds	5,412		37		(43)		5,406
Equities and other mutual funds	5,033		187		—		5,220
	$	133,811	$	224	$	(14,473)	$	119,562


	At December 31, 2022
	Cost Amount		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
Available-for-sale debt securities	$	129,372	$	—	$	(12,071)	$	117,301
SEI-sponsored mutual funds	6,207		—		(176)		6,031
Equities and other mutual funds	5,026		—		(157)		4,869
	$	140,605	$	—	$	(12,404)	$	128,201

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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+ Details

Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 7,979	$ 10,766	$ 23,458	$ 31,339
Less: Deferred tax benefit	(1,438)	(1,917)	(4,278)	(5,851)
Stock-based compensation expense, net of tax	$ 6,541	$ 8,849	$ 19,180	$ 25,488

Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America. Certain financial information and accompanying note disclosure normally included in the Company’s Annual Report on Form 10-K have been condensed or omitted. The interim financial information is unaudited but reflects all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of financial position of the Company as of September 30, 2023, the results of operations for the three and nine months ended September 30, 2023 and 2022, and cash flows for the nine months ended September 30, 2023 and 2022. These interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.
Variable Interest Entities	Variable Interest Entities The Company or its affiliates have created numerous investment products for its clients in various types of legal entity structures. The Company serves as the Manager, Administrator and Distributor for these investment products and may also serve as the Trustee for some of the investment products. The Company receives asset management, distribution, administration and custodial fees for these services. Clients are the equity investors and participate in proportion to their ownership percentage in the net income or loss and net capital gains or losses of the products, and, on liquidation, will participate in proportion to their ownership percentage in the remaining net assets of the products after satisfaction of outstanding liabilities. The Company has concluded that it is not the primary beneficiary of the entities and, therefore, is not required to consolidate any of the pooled investment vehicles for which it receives asset management, distribution, administration and custodial fees under the VIE model. The Company is a party to expense limitation agreements with certain SEI-sponsored money market funds subject to Rule 2a-7 of the Investment Company Act of 1940 which establish a maximum level of ordinary operating expenses incurred by the fund in any fiscal year including, but not limited to, fees of the administrator or its affiliates.
Revenue Recognition	Revenue RecognitionRevenue is recognized when the transfer of control of promised goods or services under the terms of a contract with customers are satisfied in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those promised goods or services. Certain portions of the Company’s revenues involve a third party in providing goods or services to its customers. In such circumstances, the Company must determine whether the nature of its promise to the customer is to provide the underlying goods or services (the Company is the principal in the transaction and reports the transaction gross) or to arrange for a third party to provide the underlying goods or services (the entity is the agent in the transaction and reports the transaction net).The Company’s principal sources of revenues are: (1) asset management, administration and distribution fees primarily earned based upon a contractual percentage of net assets under management or administration; and (2) information processing and software servicing fees that are either recurring and primarily earned based upon the number of trust accounts being serviced or a percentage of the market value of the clients' assets processed on the Company's platforms, or non-recurring and based upon project-oriented contractual agreements related to client implementations. Investment management fees from investment management agreements - Revenues based on assets of clients of the Institutional Investors segment primarily invested in Company-sponsored products. Each client is charged an investment management fee that is stated as a percentage of the market value of all assets under management. The client is billed directly on a quarterly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Revenues associated with the separately managed account program offered through registered investment advisors located throughout the United States. The contractual fee is stated as a percentage of the market value of all assets invested in the separately managed account and collected on a quarterly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment operations fees - Revenues earned from accounting and administrative services, distribution support services and regulatory and compliance services to investment management firms and family offices. The Company contracts directly with the investment management firm or family office. The contractual fees are stated as a percentage of net assets under administration and billed when asset valuations are finalized. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment processing fees - Platform as a Service - Revenues associated with clients that outsource their entire investment operation and back-office processing functions. Through the use of the Company's proprietary platforms, the Company assumes all back-office investment processing services including investment processing, custody and safekeeping of assets, income collections, securities settlement and other related trust activities. The contractual fee is based on a monthly fee plus additional fees determined on a per-account or per-transaction basis. Contractual fees can also be stated as a percentage of the value of assets processed on the Company's platforms each month as long as the fee is in excess of a monthly contractual minimum. The client is billed directly on a monthly basis. Revenues are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Investment processing fees - Software as a Service - Revenues associated with clients of the Private Banks segment for application software services. Clients retain responsibility for all investment operations, client administration and other back-office trust operations. The contractual fee is based on a monthly fee plus additional fees determined on a per-account or per-transaction basis. The client is billed directly on a monthly basis. Revenues associated with clients of the Investment Managers segment processed on the Archway PlatformSM are fees for hosted technology services to family offices and financial institutions. The Archway Platform is an integrated technology platform used for investment, operations, accounting and client reporting by these institutions. The contractual fee is based on a monthly subscription fee to access the Archway Platform along with additional fees on a per transaction basis. Revenues associated with clients of the Institutional Investors segment processed on the SEI NovusSM portfolio intelligence tool are fees for data management, performance measurement, reporting, and risk analytics. The contractual fee is based on a fixed fee to access SEI Novus and includes fees for integration of historical fund data and custom reporting. All revenues from investment processing fees are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Professional services fees - Revenues associated with the business services migration for investment processing clients of the Private Banks segment and investment operations clients of the Investment Managers segment. In addition, Professional services include other services such as business transformation consulting. Typically fees are stated as a contractual fixed fee. The client is billed directly and fees are collected according to the terms of the agreement. Account fees and other - Revenues associated with custody account servicing, account terminations, reimbursements received for out-of-pocket expenses, and other fees for the provision of ancillary services.
Cash and Cash Equivalents	Cash and Cash EquivalentsCash and cash equivalents includes $424,891 and $305,434 at September 30, 2023 and December 31, 2022, respectively, invested in SEI-sponsored open-ended money market mutual funds. Statements of Cash Flows For purposes of the Consolidated Statements of Cash Flows, the Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents.
Restricted Cash	Restricted CashRestricted cash includes $250 at September 30, 2023 and December 31, 2022 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $50 and $101 at September 30, 2023 and December 31, 2022, respectively, segregated in special reserve accounts for the benefit of customers of the Company’s broker-dealer subsidiary, SEI Investments Distribution Co. (SIDCO), in accordance with certain rules established by the Securities and Exchange Commission (SEC) for broker-dealers.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805) Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (ASU 2021-08). This update amends Topic 805 to add contract assets and contract liabilities to the list of exceptions to the recognition and measurement principles that apply to business combinations and to require that an entity (acquirer) recognize and measure contract assets and contract liabilities in accordance with ASC 606. The Company adopted ASU 2021-08 on January 1, 2023. There was no material impact to the Company's consolidated financial statements from the implementation of ASU 2021-08.
Equity Method Investments	The Company accounts for its interest in LSV using the equity method because of its less than 50% ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations.
Fair Value of Financial Instruments	The fair value of the Company’s financial assets and liabilities, except for the Company's investment funds sponsored by LSV, is determined in accordance with the fair value hierarchy. The fair value of the Company’s Level 1 financial assets consist mainly of investments in open-ended mutual funds that are quoted daily. Level 2 financial assets consist of GNMA mortgage-backed securities held by the Company's wholly-owned limited purpose federal thrift subsidiary, SEI Private Trust Company (SPTC), and Federal Home Loan Bank (FHLB) and other U.S. government agency short-term notes held by SIDCO. The financial assets held by SIDCO were purchased as part of a cash management program requiring only short term, top-tier investment grade government and corporate securities. The financial assets held by SPTC are debt securities issued by GNMA and are backed by the full faith and credit of the U.S. government. These securities were purchased for the sole purpose of satisfying applicable regulatory requirements and have maturity dates which range from 2027 to 2041. The fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets. The valuation of the Company's Level 2 financial assets held by SIDCO and SPTC are based upon securities pricing policies and procedures utilized by third-party pricing vendors. The pricing policies and procedures applied for our Level 1 and Level 2 financial assets during the nine months ended September 30, 2023 were consistent with those as described in the Company's Annual Report on Form 10-K at December 31, 2022. The Company had no Level 3 financial assets at September 30, 2023 or December 31, 2022 that were required to be measured at fair value on a recurring basis.
Investments in Affiliated Funds	The fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets.
Available-for-sale Securities	These net unrealized losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets.
Securities Owned	Securities OwnedThe Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings.

Income Taxes

9 Months Ended

Sep. 30, 2023

Income Tax Disclosure [Abstract]

Income Taxes

The gross liability for unrecognized tax benefits at September 30, 2023 and December 31, 2022 was $17,618 and $15,204, respectively, exclusive of interest and penalties, of which $17,224 and $14,431 would affect the effective tax rate if the Company were to recognize the tax benefit.

The Company classifies interest and penalties on unrecognized tax benefits as income tax expense. As of September 30, 2023 and December 31, 2022, the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $1,916 and $1,118, respectively.


	September 30, 2023		December 31, 2022
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$	17,618	$	15,204
Interest and penalties on unrecognized benefits	1,916		1,118
Total gross uncertain tax positions	$	19,534	$	16,322
Amount included in Current liabilities	$	4,172	$	4,065
Amount included in Other long-term liabilities	15,362		12,257
	$	19,534	$	16,322

The effective income tax rate for the three and nine months ended September 30, 2023 and 2022 differs from the federal income tax statutory rate due to the following:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Statutory rate	21.0	%	21.0	%	21.0	%	21.0	%
State taxes, net of federal tax benefit	2.8		3.4		2.8		2.9
Foreign tax expense and tax rate differential	(0.1)		(0.2)		(0.1)		(0.1)
Tax benefit from stock option exercises	(0.6)		(1.1)		(0.3)		(0.5)



Other, net	(0.6)		(0.1)		(0.2)		(0.2)
	22.5	%	23.0	%	23.2	%	23.1	%

The decrease in the effective tax rate for the three months ended September 30, 2023 was primarily due to a decrease in the state effective tax rate. The decrease was partially offset by lower tax benefits related to the stock option exercises as a percentage of net income in the third quarter of 2023 compared to the third quarter of 2022.

The Company files income tax returns in the United States on a consolidated basis and in many U.S. state and foreign jurisdictions. The Company is subject to examination of income tax returns by the Internal Revenue Service (IRS) and other domestic and foreign tax authorities. The Company is no longer subject to U.S. federal income tax examination for years before 2019 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2015.

The Company estimates it will recognize $4,172 of gross unrecognized tax benefits. This amount is expected to be paid within one year or to be removed at the expiration of the statute of limitations and resolution of income tax audits and is netted against the current payable account. These unrecognized tax benefits are related to tax positions taken on certain federal, state, and foreign tax returns. However, the timing of the resolution of income tax examinations is highly uncertain, and the amounts ultimately paid, if any, upon resolution of the issues raised by the taxing authorities may differ materially from the amounts accrued for each year. While it is reasonably possible that some issues under examination could be resolved in the next twelve months, based upon the current facts and circumstances, the Company cannot reasonably estimate the timing of such resolution or the total range of potential changes as it relates to the current unrecognized tax benefits that are recorded as part of the Company’s financial statements.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

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+ Details

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and ContingenciesIn the ordinary course of business, the Company from time to time enters into contracts containing indemnification obligations of the Company. These obligations may require the Company to make payments to another party upon the occurrence of certain events including the failure by the Company to meet its performance obligations under the contract. These contractual indemnification provisions are often standard contractual terms of the nature customarily found in the type of contracts entered into by the Company. In many cases, there are no stated or notional amounts included in the indemnification provisions. There are no amounts recognized on the Consolidated Balance Sheet as of September 30, 2023 and December 31, 2022 related to these indemnifications. Legal Proceedings The Company is a party to various disputes, actions and claims that the Company does not believe are material. The Company believes that the ultimate resolution of these matters will not have a material adverse effect on the Company's financial position or the manner in which the Company conducts its business. Currently, the Company does not believe the amount of losses, if any, associated with these matters can be estimated. While the Company does not believe that the amount of such losses will, when liquidated or estimable, be material to its financial position, the assumptions upon which these beliefs are based may be incorrect and, if so, any such loss could have a material adverse effect on the Company's results of operations or the manner in which the Company conducts its business in the period(s) during which the underlying matters are resolved.

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 2,023,553	$ 1,922,088	$ 1,953,824	$ 1,860,763
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive loss before reclassifications			(1,696)
Amounts reclassified from accumulated other comprehensive loss			128
Total other comprehensive loss, net of tax	(10,556)	(21,826)	(1,568)	(47,746)
Ending balance	2,083,881	1,930,313	2,083,881	1,930,313
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(39,979)	(45,763)	(48,967)	(19,843)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Total other comprehensive loss, net of tax	(10,556)	(21,826)	(1,568)	(47,746)
Ending balance	(50,535)	$ (67,589)	(50,535)	$ (67,589)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(39,673)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive loss before reclassifications			249
Amounts reclassified from accumulated other comprehensive loss			0
Total other comprehensive loss, net of tax			249
Ending balance	(39,424)		(39,424)
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(9,294)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive loss before reclassifications			(1,945)
Amounts reclassified from accumulated other comprehensive loss			128
Total other comprehensive loss, net of tax			(1,817)
Ending balance	$ (11,111)		$ (11,111)

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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+ Details

Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income	$ 341,527	$ 363,243
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1)	4,455	65,276
Net cash provided by operating activities	345,982	428,519
Cash flows from investing activities:
Additions to property and equipment	(23,114)	(32,319)
Additions to capitalized software	(26,584)	(24,827)
Purchases of marketable securities	(83,968)	(124,454)
Prepayments and maturities of marketable securities	89,352	124,040
Sales of marketable securities	893	179
Other investing activities	(4,816)	(2,961)
Net cash used in investing activities	(48,237)	(60,342)
Cash flows from financing activities:
Repayments under revolving credit facility	0	(40,000)
Payment of contingent consideration	(8,799)	(868)
Purchase and retirement of common stock	(236,914)	(266,549)
Proceeds from issuance of common stock	65,660	35,909
Payment of dividends	(114,833)	(109,830)
Net cash used in financing activities	(294,886)	(381,338)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,474)	(26,809)
Net increase (decrease) in cash, cash equivalents and restricted cash	1,385	(39,970)
Cash, cash equivalents and restricted cash, beginning of period	853,359	831,758
Cash, cash equivalents and restricted cash, end of period	$ 854,744	$ 791,788

Income Taxes (Effective Income Tax Rate Reconciliation) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Statutory rate	21.00%	21.00%	21.00%	21.00%
State taxes, net of federal tax benefit	2.80%	3.40%	2.80%	2.90%
Foreign tax expense and tax rate differential	(0.10%)	(0.20%)	(0.10%)	(0.10%)
Tax benefit from stock option exercises	(0.60%)	(1.10%)	(0.30%)	(0.50%)
Other, net	(0.60%)	(0.10%)	(0.20%)	(0.20%)
Effective income tax rate	22.50%	23.00%	23.20%	23.10%

Line of Credit	9 Months Ended
Line of Credit	Sep. 30, 2023
Line of Credit Facility [Abstract]
Line of Credit	Line of Credit The Company has a five-year $325,000 Credit Agreement (the Credit Facility) with Wells Fargo Bank, N.A., and a syndicate of other lenders. The Credit Facility is scheduled to expire in April 2026, at which time any aggregate principal amount of loans outstanding becomes payable in full. Any borrowings made under the Credit Facility will accrue interest at rates that, at the Company's option, are based on a base rate (the Base Rate) plus a premium that can range from 0.25% to 1.00% or the Adjusted Term Secured Overnight Financing Rate (SOFR) plus a premium that can range from 1.25% to 2.00% depending on the Company’s Leverage Ratio (a ratio of consolidated indebtedness to consolidated EBITDA for the four preceding fiscal quarters, all as defined in the related agreement). The Base Rate is defined as the highest of a) the Prime Rate, b) the Federal Funds Rate plus 0.50% and c) the Adjusted Term SOFR for a one-month tenor in effect on such day plus 1.00%. The Company also pays quarterly commitment fees based on the unused portion of the Credit Facility. The quarterly fees for the Credit Facility can range from 0.15% of the amount of the unused portion to 0.30%, depending on the Company’s Leverage Ratio. Certain wholly-owned subsidiaries of the Company have guaranteed the obligations of the Company under the agreement. The aggregate amount of the Credit Facility may be increased by an additional $100,000 under certain conditions set forth in the agreement. The Company may issue up to $15,000 in letters of credit under the terms of the Credit Facility. The Company pays a periodic commission fee of 1.25% plus an issuance fee of 0.20% of the aggregate face amount of the outstanding letters of credit issued under the Credit Facility. The Credit Facility contains covenants with restrictions on the ability of the Company to do transactions with affiliates other than wholly-owned subsidiaries or to incur liens or certain types of indebtedness as defined in the agreement. In the event of a default under the Credit Facility, the Company would also be restricted from paying dividends on, or repurchasing, its common stock without the approval of the lenders. Upon the occurrence of certain financial or economic events, significant corporate events, or certain other events of default constituting an event of default under the Credit Facility, all loans outstanding may be declared immediately due and payable and all commitments under the agreement may be terminated. On April 17, 2023, the Company and the lenders amended the Credit Facility to add SOFR as an alternative reference rate for borrowings in place of LIBOR. All other terms and conditions of the original agreement remain in effect. The Company was in compliance with all covenants of the Credit Facility during the nine months ended September 30, 2023. As of October 12, 2023, the Company had outstanding letters of credit of $4,866 under the Credit Facility. The amount of the Credit Facility that is available for general corporate purposes as of October 12, 2023 was $320,134.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

+ Details

Business Segment Information

9 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

Business Segment Information

The Company’s reportable business segments are:

Private Banks – Provides outsourced investment processing and investment management platforms to banks and trust institutions, independent wealth advisers and financial advisors worldwide;

Investment Advisors – Provides investment management and investment processing platforms to affluent investors through a network of independent registered investment advisors, financial planners and other investment professionals in the United States;

Institutional Investors – Provides Outsourced Chief Investment Officer and Enhanced Chief Investment Officer solutions, including investment management and administrative outsourcing platforms to retirement plan sponsors, healthcare systems, higher education and other not-for-profit organizations worldwide;

Investment Managers – Provides investment operations outsourcing platforms to fund companies, banking institutions, traditional and non-traditional investment managers worldwide and family offices in the United States; and

Investments in New Businesses – Focuses on providing investment management solutions to ultra-high-net-worth families residing in the United States; developing network and data protection services; modularizing larger technology platforms; entering new markets; and conducting other research and development activities.

The information in the following tables is derived from internal financial reporting used for corporate management purposes. There are no inter-segment revenues for the three and nine months ended September 30, 2023 and 2022. Assets are not allocated to segments for internal reporting purposes. The accounting policies of the reportable business segments are the same as those described in Note 1 to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.

The following tables highlight certain financial information about each of the business segments for the three months ended September 30, 2023 and 2022:


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
	For the Three Months Ended September 30, 2023
Revenues	$	121,469	$	110,461	$	70,479	$	169,293	$	5,057	$	476,759
Expenses	113,105		64,280		39,953		108,078		11,874		337,290
Operating profit (loss)	$	8,364	$	46,181	$	30,526	$	61,215	$	(6,817)	$	139,469


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
	For the Three Months Ended September 30, 2022
Revenues	$	122,660	$	109,565	$	78,260	$	156,015	$	4,834	$	471,334
Expenses	116,661		61,150		42,149		100,876		9,915		330,751
Operating profit (loss)	$	5,999	$	48,415	$	36,111	$	55,139	$	(5,081)	$	140,583

A reconciliation of the total operating profit reported for the business segments to income from operations in the Consolidated Statements of Operations for the three months ended September 30, 2023 and 2022 is as follows:


	2023		2022
Total operating profit from segments	$	139,469	$	140,583
Corporate overhead expenses (1)	(30,997)		(89,537)
Income from operations	$	108,472	$	51,046

(1) Corporate overhead expenses in 2022 include costs for the Voluntary Separation Program of $56,996.

The following tables provide additional information for the three months ended September 30, 2023 and 2022 pertaining to the business segments:


	Capital Expenditures (2)				Depreciation
	2023		2022		2023		2022
Private Banks	$	7,580	$	8,404	$	5,565	$	5,050
Investment Advisors	3,545		3,476		540		513
Institutional Investors	390		1,080		338		283
Investment Managers	2,804		9,843		2,424		2,498
Investments in New Businesses	222		227		83		36
Total from business segments	$	14,541	$	23,030	$	8,950	$	8,380
Corporate overhead	307		486		247		178
	$	14,848	$	23,516	$	9,197	$	8,558

(2) Capital expenditures include additions to property and equipment and capitalized software.


	Amortization
	2023		2022
Private Banks	$	4,852	$	4,515
Investment Advisors	1,933		1,736
Institutional Investors	1,834		1,808
Investment Managers	959		2,121
Investments in New Businesses	145		145
Total from business segments	$	9,723	$	10,325
Corporate overhead	74		57
	$	9,797	$	10,382

The following tables highlight certain financial information about each of business segment for the nine months ended September 30, 2023 and 2022:


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
	For the Nine Months Ended September 30, 2023
Revenues	$	378,171	$	326,579	$	219,914	$	495,318	$	14,953	$	1,434,935
Expenses	343,442		192,004		126,337		321,705		34,089		1,017,577
Operating profit (loss)	$	34,729	$	134,575	$	93,577	$	173,613	$	(19,136)	$	417,358


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
	For the Nine Months Ended September 30, 2022
Revenues	$	460,392	$	341,989	$	248,582	$	468,842	$	14,642	$	1,534,447
Expenses	359,676		189,045		131,432		300,520		34,709		1,015,382
Operating profit (loss)	$	100,716	$	152,944	$	117,150	$	168,322	$	(20,067)	$	519,065

A reconciliation of the total operating profit reported for the business segments to income from operations in the Consolidated Statements of Operations for the nine months ended September 30, 2023 and 2022:


	2023		2022
Total operating profit from segments	$	417,358	$	519,065
Corporate overhead expenses (1)	(94,518)		(137,360)
Income from operations	$	322,840	$	381,705

(1) Corporate overhead expenses in 2022 include costs for the Voluntary Separation Program of $56,996.

The following tables provide additional information for the nine months ended September 30, 2023 and 2022:


	Capital Expenditures (2)				Depreciation
	2023		2022		2023		2022
Private Banks	$	24,652	$	24,167	$	16,369	$	15,710
Investment Advisors	11,499		9,926		1,557		1,438
Institutional Investors	1,495		3,057		923		857
Investment Managers	10,002		17,980		6,789		6,273
Investments in New Businesses	766		640		214		124
Total from business segments	$	48,414	$	55,770	$	25,852	$	24,402
Corporate Overhead	1,284		1,376		657		540
	$	49,698	$	57,146	$	26,509	$	24,942

(2) Capital expenditures include additions to property and equipment and capitalized software.


	Amortization
	2023		2022
Private Banks	$	14,216	$	21,315
Investment Advisors	5,696		8,127
Institutional Investors	5,487		6,348
Investment Managers	2,815		7,274
Investments in New Businesses	434		515
Total from business segments	$	28,648	$	43,579
Corporate Overhead	203		198
	$	28,851	$	43,777

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-15

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-31

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-40

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//280/tableOfContent

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 26
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-26

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-34

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

+ Details

Investment In Unconsolidated Affiliate (Tables)

9 Months Ended

Sep. 30, 2023

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Equity Method Investments

These tables contain condensed financial information of LSV:


Condensed Statement of Operations	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Revenues	$	102,183	$	91,588	$	309,211	$	299,852
Net income	77,566		69,013		237,119		229,997


Condensed Balance Sheets	September 30, 2023		December 31, 2022
Current assets	$	121,830	$	158,326
Non-current assets	6,662		6,019
Total assets	$	128,492	$	164,345

Current liabilities	$	64,273	$	77,306
Non-current liabilities	2,405		3,050
Partners’ capital	61,814		83,989
Total liabilities and partners’ capital	$	128,492	$	164,345

Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
	May 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Apr. 18, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase (decrease) in stock-based compensation from change in management's estimate				$ 4,859
Unrecognized compensation cost		$ 90,469		90,469
Total intrinsic value of options exercised				22,444
Aggregate intrinsic value of options exercisable		$ 60,297		$ 60,297
Market value of Company's common stock (in USD per share)		$ 60.23		$ 60.23
Weighted average exercise price per share (in USD per share)		$ 53.90		$ 53.90
Total options outstanding (in shares)		16,445		16,445
Total options exercisable (in shares)		7,581		7,581
Dividends declared (in USD per share)	$ 0.43	$ 0	$ 0	$ 0.43	$ 0.40
Cash dividends declared				$ 57,177	$ 54,378
Common Stock Buyback
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased and retired (in shares)				4,050
Company purchased, cost				$ 241,848
Additional authorized amount						$ 250,000
Remaining stock repurchase authorization amount						$ 101,005
2014 Plan \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate				50.00%
2014 Plan \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate				50.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award waiting period				2 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award waiting period				4 years

Fair Value Measurements

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value MeasurementsThe fair value of the Company’s financial assets and liabilities, except for the Company's investment funds sponsored by LSV, is determined in accordance with the fair value hierarchy. The fair value of the Company’s Level 1 financial assets consist mainly of investments in open-ended mutual funds that are quoted daily. Level 2 financial assets consist of GNMA mortgage-backed securities held by the Company's wholly-owned limited purpose federal thrift subsidiary, SEI Private Trust Company (SPTC), and Federal Home Loan Bank (FHLB) and other U.S. government agency short-term notes held

by SIDCO. The financial assets held by SIDCO were purchased as part of a cash management program requiring only short term, top-tier investment grade government and corporate securities. The financial assets held by SPTC are debt securities issued by GNMA and are backed by the full faith and credit of the U.S. government. These securities were purchased for the sole purpose of satisfying applicable regulatory requirements and have maturity dates which range from 2027 to 2041.

The fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets.

The valuation of the Company's Level 2 financial assets held by SIDCO and SPTC are based upon securities pricing policies and procedures utilized by third-party pricing vendors.

The pricing policies and procedures applied for our Level 1 and Level 2 financial assets during the nine months ended September 30, 2023 were consistent with those as described in the Company's Annual Report on Form 10-K at December 31, 2022. The Company had no Level 3 financial assets at September 30, 2023 or December 31, 2022 that were required to be measured at fair value on a recurring basis. There were no transfers of financial assets between levels within the fair value hierarchy during the nine months ended September 30, 2023.

The fair value of certain financial assets of the Company was determined using the following inputs:


			Fair Value Measurements at the End of the Reporting Period Using
Assets	September 30, 2023		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Equity securities	$	10,626	$	10,626	$	—
Available-for-sale debt securities	108,936		—		108,936
Fixed-income securities owned	32,748		—		32,748
Investment funds sponsored by LSV (1)	6,838
	$	159,148	$	10,626	$	141,684


			Fair Value Measurements at the End of the Reporting Period Using
Assets	December 31, 2022		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Equity securities	$	10,900	$	10,900	$	—
Available-for-sale debt securities	117,301		—		117,301
Fixed-income securities owned	32,148		—		32,148
Investment funds sponsored by LSV (1)	6,366
	$	166,715	$	10,900	$	149,449

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 854,443	$ 853,008
Restricted cash	301	351
Receivables from investment products	55,687	62,014
Receivables, net of allowance for doubtful accounts of $1,184 and $901	518,854	457,084
Securities owned	32,748	32,148
Other current assets	57,357	48,703
Total Current Assets	1,519,390	1,453,308
Property and Equipment, net of accumulated depreciation of $465,297 and $440,861	177,521	181,029
Operating Lease Right-of-Use Assets	20,686	24,992
Capitalized Software, net of accumulated amortization of $606,214 and $586,744	244,416	237,302
Available for Sale and Equity Securities	119,562	128,201
Investments in Affiliated Funds, at fair value	6,838	6,366
Investment in Unconsolidated Affiliate	44,645	104,673
Goodwill	115,597	115,599
Intangible Assets, net of accumulated amortization of $39,432 and $30,261	46,413	55,532
Deferred Contract Costs	38,518	37,928
Deferred Income Taxes	26,449	4,936
Other Assets, net	37,201	33,687
Total Assets	2,397,236	2,383,553
Current Liabilities:
Accounts payable	10,198	13,283
Accrued liabilities	249,872	359,363
Current portion of long-term operating lease liabilities	9,882	10,344
Deferred revenue	12,100	14,893
Total Current Liabilities	282,052	397,883
Long-term Income Taxes Payable	803	803
Long-term Operating Lease Liabilities	15,138	18,786
Other Long-term Liabilities	15,362	12,257
Total Liabilities	313,355	429,729
Commitments and Contingencies
Shareholders' Equity:
Common stock, $0.01 par value, 750,000 shares authorized; 131,571 and 134,162 shares issued and outstanding	1,316	1,342
Capital in excess of par value	1,369,465	1,307,162
Retained earnings	763,635	694,287
Accumulated other comprehensive loss, net	(50,535)	(48,967)
Total Shareholders' Equity	2,083,881	1,953,824
Total Liabilities and Shareholders' Equity	$ 2,397,236	$ 2,383,553

Business Acquisition	9 Months Ended
Business Acquisition	Sep. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Business Acquisition	Business Acquisition On July 13, 2023, the Company announced that SEI Investments (Europe) Limited (SIEL), its wholly-owned operating subsidiary in the United Kingdom, has entered into an option agreement to acquire the outstanding equity of XPS Pensions (Nexus) Limited, principal employer and scheme funder of the National Pensions Trust (NPT), from its parent company, XPS Pensions Group PLC (XPS). The total cash consideration payable to XPS for Nexus is up to £42,500, comprised of a £35,000 initial consideration paid at closing and deferred consideration of up to £7,500 that may be earned over two years after the closing, subject to the achievement of certain post-closing performance measurements. The transaction is expected to close before year end, subject to applicable regulatory approval and other customary closing conditions.

Income Taxes (Tables)

9 Months Ended

Sep. 30, 2023

Income Tax Disclosure [Abstract]

Schedule of Interest And Penalties


	September 30, 2023		December 31, 2022
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$	17,618	$	15,204
Interest and penalties on unrecognized benefits	1,916		1,118
Total gross uncertain tax positions	$	19,534	$	16,322
Amount included in Current liabilities	$	4,172	$	4,065
Amount included in Other long-term liabilities	15,362		12,257
	$	19,534	$	16,322

Schedule of Effective Income Tax Rate Reconciliation

The effective income tax rate for the three and nine months ended September 30, 2023 and 2022 differs from the federal income tax statutory rate due to the following:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Statutory rate	21.0	%	21.0	%	21.0	%	21.0	%
State taxes, net of federal tax benefit	2.8		3.4		2.8		2.9
Foreign tax expense and tax rate differential	(0.1)		(0.2)		(0.1)		(0.1)
Tax benefit from stock option exercises	(0.6)		(1.1)		(0.3)		(0.5)



Other, net	(0.6)		(0.1)		(0.2)		(0.2)
	22.5	%	23.0	%	23.2	%	23.1	%

Revenues from Contracts with Customers (Tables)

9 Months Ended

Sep. 30, 2023

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
Major Product Lines:	For the Three Months Ended September 30, 2023
Investment management fees from pooled investment products	$	32,119	$	60,046	$	11,858	$	87	$	351	$	104,461
Investment management fees from investment management agreements	900		45,175		54,317		—		4,240		104,632
Investment operations fees	336		2		—		156,717		—		157,055
Investment processing fees - PaaS	60,564		1,183		50		86		13		61,896
Investment processing fees - SaaS	21,972		—		2,291		4,269		—		28,532
Professional services fees	4,539		—		—		370		—		4,909
Account fees and other	1,039		4,055		1,963		7,764		453		15,274
Total revenues	$	121,469	$	110,461	$	70,479	$	169,293	$	5,057	$	476,759

Primary Geographic Markets:
United States	$	78,306	$	110,461	$	58,992	$	153,368	$	5,057	$	406,184
United Kingdom	28,789		—		8,442		—		—		37,231
Canada	10,060		—		1,431		—		—		11,491
Ireland	4,314		—		1,614		9,711		—		15,639
Luxembourg	—		—		—		6,214		—		6,214

Total revenues	$	121,469	$	110,461	$	70,479	$	169,293	$	5,057	$	476,759


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
Major Product Lines:	For the Three Months Ended September 30, 2022
Investment management fees from pooled investment products	$	30,002	$	63,688	$	12,928	$	81	$	367	$	107,066
Investment management fees from investment management agreements	633		39,915		60,887		—		3,992		105,427
Investment operations fees	336		—		—		144,181		—		144,517
Investment processing fees - PaaS	57,818		—		—		—		—		57,818
Investment processing fees - SaaS	29,855		—		2,650		3,963		—		36,468
Professional services fees	3,195		—		—		798		—		3,993
Account fees and other	821		5,962		1,795		6,992		475		16,045
Total revenues	$	122,660	$	109,565	$	78,260	$	156,015	$	4,834	$	471,334

Primary Geographic Markets:
United States	$	81,628	$	109,565	$	65,571	$	141,928	$	4,834	$	403,526
United Kingdom	27,186		—		9,729		—		—		36,915
Canada	10,495		—		1,357		—		—		11,852
Ireland	3,351		—		1,570		9,580		—		14,501
Luxembourg	—				—		4,507				4,507
Other	—		—		33		—		—		33
Total revenues	$	122,660	$	109,565	$	78,260	$	156,015	$	4,834	$	471,334

The following tables provide additional information pertaining to our revenues disaggregated by major product line and primary geographic market based on the location of the use of the products or services for each of the Company’s business segments for the nine months ended September 30, 2023 and 2022:


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
Major Product Lines:	For the Nine Months Ended September 30, 2023
Investment management fees from pooled investment products	$	96,432	$	181,754	$	36,295	$	318	$	1,041	$	315,840
Investment management fees from investment management agreements	2,210		129,000		169,875		—		12,479		313,564
Investment operations fees	1,019		—		—		456,624		—		457,643
Investment processing fees - PaaS	185,320		3,479		330		160		33		189,322
Investment processing fees - SaaS	66,913		—		7,733		12,686		—		87,332
Professional services fees (1)	23,213		—		—		2,613		—		25,826
Account fees and other	3,064		12,346		5,681		22,917		1,400		45,408
Total revenues	$	378,171	$	326,579	$	219,914	$	495,318	$	14,953	$	1,434,935

Primary Geographic Markets:
United States	$	249,759	$	326,579	$	184,332	$	450,173	$	14,953	$	1,225,796
United Kingdom	84,619		—		26,221		—		—		110,840
Canada	30,297		—		4,247		—		—		34,544
Ireland	13,496		—		5,114		27,714		—		46,324
Luxembourg	—		—		—		17,431		—		17,431

Total revenues	$	378,171	$	326,579	$	219,914	$	495,318	$	14,953	$	1,434,935


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
Major Product Lines:	For the Nine Months Ended September 30, 2022
Investment management fees from pooled investment products	$	95,113	$	203,171	$	42,494	$	288	$	1,136	$	342,202
Investment management fees from investment management agreements	1,504		122,321		192,559		—		12,191		328,575
Investment operations fees	1,040		—		—		434,302		—		435,342
Investment processing fees - PaaS	170,651		—		—		—		—		170,651
Investment processing fees - SaaS	89,259		—		8,781		11,532		—		109,572
Professional services fees (2)	100,020		—		—		1,822		—		101,842
Account fees and other	2,805		16,497		4,748		20,898		1,315		46,263
Total revenues	$	460,392	$	341,989	$	248,582	$	468,842	$	14,642	$	1,534,447

Primary Geographic Markets:
United States	$	244,472	$	341,989	$	204,836	$	428,303	$	14,642	$	1,234,242
United Kingdom	171,042		—		33,761		—		—		204,803
Canada	33,318		—		4,023		—		—		37,341
Ireland	11,560		—		5,700		28,818		—		46,078
Luxembourg	—				—		11,721				11,721
Other	—		—		262		—		—		262
Total revenues	$	460,392	$	341,989	$	248,582	$	468,842	$	14,642	$	1,534,447

Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]
Total investment in LSV	$ 44,645		$ 44,645
Distributions received from LSV			100,252	$ 103,504
Company's share in the earnings of LSV	$ 29,927	$ 26,654	$ 91,517	$ 88,926
L S V Asset Management
Schedule of Equity Method Investments [Line Items]
Ownership interest in LSV	38.60%		38.60%

Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2023

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Nature of Operations

SEI Investments Company (the Company), a Pennsylvania corporation, provides comprehensive platforms, services and infrastructure–encompassing technology, operational, and investment management services–to help wealth managers, financial advisors, investment managers, family offices, institutional and private investors create and manage wealth.

Investment processing platforms provide technologies and business process outsourcing services for wealth managers. These solutions include investment advisory, client relationship, and other technology-enabled capabilities for the front office; administrative and investment services for the middle office; and accounting and processing services for the back office. Revenues from investment processing platforms are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations.

Investment operations platforms provide business process outsourcing services for investment managers and asset owners. These platforms support a broad range of traditional and alternative investments and provide technology-enabled information analytics and investor capabilities for the front office; administrative and investment services for the middle office; and fund administration and accounting services for the back office. Revenues from investment operations platforms are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Investment management platforms provide comprehensive solutions for managing personal and institutional wealth. These platforms include goals-based investment strategies; SEI-sponsored investment products, including mutual funds, collective investment products, alternative investment portfolios and separately managed accounts (SMA); and other market-specific advice, technology and operational components. These platforms are offered to wealth managers as part of a complete goals-based investment program for their end-investors. For institutional investors, the Company provides Outsourced Chief Investment Officer (OCIO) solutions and Enhanced Chief Investment Officer (ECIO) solutions that include investment management programs, as well as advisory and administrative services. Revenues from investment management platforms are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Basis of Presentation

The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America. Certain financial information and accompanying note disclosure normally included in the Company’s Annual Report on Form 10-K have been condensed or omitted. The interim financial information is unaudited but reflects all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of financial position of the Company as of September 30, 2023, the results of operations for the three and nine months ended September 30, 2023 and 2022, and cash flows for the nine months ended September 30, 2023 and 2022. These interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.

There have been no significant changes in significant accounting policies during the nine months ended September 30, 2023 as compared to the significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2022.

Variable Interest Entities

The Company or its affiliates have created numerous investment products for its clients in various types of legal entity structures. The Company serves as the Manager, Administrator and Distributor for these investment products and may also serve as the Trustee for some of the investment products. The Company receives asset management, distribution, administration and custodial fees for these services. Clients are the equity investors and participate in proportion to their ownership percentage in the net income or loss and net capital gains or losses of the products, and, on liquidation, will participate in proportion to their ownership percentage in the remaining net assets of the products after satisfaction of outstanding liabilities. The Company has concluded that it is not the primary beneficiary of the entities and, therefore, is not required to consolidate any of the pooled investment vehicles for which it receives asset management, distribution, administration and custodial fees under the VIE model.

The Company is a party to expense limitation agreements with certain SEI-sponsored money market funds subject to Rule 2a-7 of the Investment Company Act of 1940 which establish a maximum level of ordinary operating expenses incurred by

the fund in any fiscal year including, but not limited to, fees of the administrator or its affiliates. Under the terms of these agreements, the Company waived $5,519 and $7,896 in fees during the three months ended September 30, 2023 and 2022, respectively. During the nine months ended September 30, 2023 and 2022, the Company waived $16,400 and $28,120, respectively, in fees.

Revenue Recognition

Revenue is recognized when the transfer of control of promised goods or services under the terms of a contract with customers are satisfied in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those promised goods or services. Certain portions of the Company’s revenues involve a third party in providing goods or services to its customers. In such circumstances, the Company must determine whether the nature of its promise to the customer is to provide the underlying goods or services (the Company is the principal in the transaction and reports the transaction gross) or to arrange for a third party to provide the underlying goods or services (the entity is the agent in the transaction and reports the transaction net). See Note 13 for related disclosures regarding revenue recognition.

Cash and Cash Equivalents

Cash and cash equivalents includes $424,891 and $305,434 at September 30, 2023 and December 31, 2022, respectively, invested in SEI-sponsored open-ended money market mutual funds. See Note 5 for information related to the Company's total investments in SEI-sponsored and non-SEI-sponsored money market mutual funds and commercial paper classified as cash equivalents.

Restricted Cash

Restricted cash includes $250 at September 30, 2023 and December 31, 2022 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $50 and $101 at September 30, 2023 and December 31, 2022, respectively, segregated in special reserve accounts for the benefit of customers of the Company’s broker-dealer subsidiary, SEI Investments Distribution Co. (SIDCO), in accordance with certain rules established by the Securities and Exchange Commission (SEC) for broker-dealers.

Capitalized Software

The Company capitalized $13,706 and $19,543 of software development costs during the nine months ended September 30, 2023 and 2022, respectively, related to significant enhancements to the SEI Wealth PlatformSM (SWP). As of September 30, 2023, the net book value of SWP was $220,654. The net book value includes $1,439 of capitalized software development costs in-progress associated with future releases of SWP. Capitalized software development costs in-progress associated with future releases of SWP were $14,217 as of December 31, 2022. SWP has a weighted average remaining life of 9.2 years. Amortization expense for SWP was $19,027 and $29,696 during the nine months ended September 30, 2023 and 2022, respectively.

The Company also capitalized $12,878 of software development costs during the nine months ended September 30, 2023 related to a new platform for the Investment Managers segment. Capitalized software development costs in-progress associated with this platform were $22,522 and $9,558 as of September 30, 2023 and December 31, 2022, respectively. The platform is not yet ready for use.

Earnings per Share

The calculations of basic and diluted earnings per share for the three and nine months ended September 30, 2023 and 2022 are:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Net income	$	115,661	$	61,659	$	341,527	$	363,243
Shares used to compute basic earnings per common share	132,231,000		135,203,000		133,035,000		136,524,000
Dilutive effect of stock options	1,273,000		1,142,000		1,215,000		1,434,000
Shares used to compute diluted earnings per common share	133,504,000		136,345,000		134,250,000		137,958,000
Basic earnings per common share	$	0.87	$	0.46	$	2.57	$	2.66
Diluted earnings per common share	$	0.87	$	0.45	$	2.54	$	2.63

During the three months ended September 30, 2023 and 2022, employee stock options to purchase 10,869,000 and 11,862,000 shares of common stock with an average exercise price of $61.31 and $60.26, respectively, were outstanding but not included in the computation of diluted earnings per common share. During the nine months ended September 30,

2023 and 2022, employee stock options to purchase 11,049,000 and 12,048,000 shares of common stock with an average exercise price of $61.29 and $60.27, respectively, were outstanding but not included in the computation of diluted earnings per common share.These options for the three and nine month periods were not included in the computation of diluted earnings per common share because either the performance conditions have not been satisfied or would not have been satisfied if the reporting date was the end of the contingency period or the options' exercise price was greater than the average market price of the Company’s common stock and the effect on diluted earnings per common share would have been anti-dilutive.

Recently Adopted Accounting Pronouncements

In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805) Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (ASU 2021-08). This update amends Topic 805 to add contract assets and contract liabilities to the list of exceptions to the recognition and measurement principles that apply to business combinations and to require that an entity (acquirer) recognize and measure contract assets and contract liabilities in accordance with ASC 606. The Company adopted ASU 2021-08 on January 1, 2023. There was no material impact to the Company's consolidated financial statements from the implementation of ASU 2021-08.

Statements of Cash Flows

For purposes of the Consolidated Statements of Cash Flows, the Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents.

The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the nine months ended September 30:


	2023		2022
Net income	$	341,527	$	363,243
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	26,509		24,942
Amortization	28,851		43,777
Equity in earnings of unconsolidated affiliate	(91,517)		(88,926)
Distributions received from unconsolidated affiliate	100,252		103,504
Stock-based compensation	23,458		31,339
Provision for losses on receivables	283		734
Deferred income tax expense	(20,971)		(41,419)
Net (gain) loss from investments	(1,053)		4,515

Change in other long-term liabilities	3,105		3,014
Change in other assets	1,099		(4,820)
Contract costs capitalized, net of amortization	(590)		(1,554)
Other	2,122		(6,934)
Change in current assets and liabilities
(Increase) decrease in
Receivables from investment products	6,327		(32,187)
Receivables	(62,053)		(41,697)
Other current assets	(8,654)		(11,422)
Advances due from unconsolidated affiliate	51,293		54,328
(Decrease) increase in
Accounts payable	(3,085)		(2,103)
Accrued liabilities	(48,128)		27,092
Deferred revenue	(2,793)		3,093
Total adjustments	4,455		65,276
Net cash provided by operating activities	$	345,982	$	428,519

Marketable Securities

9 Months Ended

Sep. 30, 2023

Marketable Securities [Abstract]

Marketable Securities

Marketable securities include investments in money market funds and commercial paper classified as cash equivalents, available-for-sale debt securities, investments in SEI-sponsored and non-SEI-sponsored mutual funds, equities, investments in funds sponsored by LSV and securities owned by SIDCO.

Cash Equivalents

Investments in SEI-sponsored and non-SEI-sponsored money market funds and commercial paper classified as cash equivalents had a fair value of $588,227 and $450,240 at September 30, 2023 and December 31, 2022, respectively. There were no material unrealized or realized gains or losses from these investments during the nine months ended September 30, 2023 and 2022. Investments in money market funds and commercial paper are Level 1 assets.

Available for Sale and Equity Securities

Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of:


	At September 30, 2023
	Cost Amount		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
Available-for-sale debt securities	$	123,366	$	—	$	(14,430)	$	108,936
SEI-sponsored mutual funds	5,412		37		(43)		5,406
Equities and other mutual funds	5,033		187		—		5,220
	$	133,811	$	224	$	(14,473)	$	119,562


	At December 31, 2022
	Cost Amount		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
Available-for-sale debt securities	$	129,372	$	—	$	(12,071)	$	117,301
SEI-sponsored mutual funds	6,207		—		(176)		6,031
Equities and other mutual funds	5,026		—		(157)		4,869
	$	140,605	$	—	$	(12,404)	$	128,201

Net unrealized losses at September 30, 2023 of available-for-sale debt securities were $11,111 (net of income tax benefit of $3,319). Net unrealized losses at December 31, 2022 of available-for-sale debt securities were $9,294 (net of income tax benefit of $2,777). These unrealized losses are associated with the Company’s investments in mortgage-backed securities issued by GNMA and were caused by interest rate increases (See Note 4). The contractual cash flows of these securities are guaranteed by an agency of the U.S. government. Accordingly, it is expected that the securities would not be settled at a price less than the amortized cost bases of the Company's investments. The Company does not intend to sell the investments and it is not likely that the Company will be required to sell the investments before recovery of their amortized cost bases. These net unrealized losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets.

There were gross realized losses of $167 and $521 from available-for-sale debt securities during the nine months ended September 30, 2023 and 2022, respectively. There were no gross realized gains from available-for-sale debt securities during the nine months ended September 30, 2023 and 2022. Realized losses from available-for-sale debt securities, including amounts reclassified from accumulated comprehensive loss, are reflected in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations.

There were gross realized gains of $63 and gross realized losses of $101 from mutual funds and equities during the nine months ended September 30, 2023. There were gross realized gains of $226 and gross realized losses of $714 from mutual funds and equities during the nine months ended September 30, 2022. Gains and losses from mutual funds and equities are reflected in Net (loss) gain from investments on the accompanying Consolidated Statements of Operations.

Investments in Affiliated Funds

The Company has an investment in funds sponsored by LSV. The Company records this investment on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these funds are recognized in Net (loss) gain from investments on the accompanying Consolidated Statements of Operations.

The funds had a fair value of $6,838 and $6,366 at September 30, 2023 and December 31, 2022, respectively. The Company recognized unrealized gains of $66 and unrealized losses of $380 during the three months ended September 30, 2023 and 2022, respectively, from the change in fair value of the funds. The Company recognized unrealized gains of $472 and unrealized losses of $1,296 during the nine months ended September 30, 2023 and 2022, respectively, from the change in fair value of the funds.

Securities Owned

The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings. The securities had a fair value of $32,748 and $32,148 at September 30, 2023 and December 31, 2022, respectively. There were no material net gains or losses related to the securities during the three and nine months ended September 30, 2023 and 2022.

Business Segment Information (Tables)

9 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

Schedule Of Financial Information About Business Segments

The following tables highlight certain financial information about each of the business segments for the three months ended September 30, 2023 and 2022:


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
	For the Three Months Ended September 30, 2023
Revenues	$	121,469	$	110,461	$	70,479	$	169,293	$	5,057	$	476,759
Expenses	113,105		64,280		39,953		108,078		11,874		337,290
Operating profit (loss)	$	8,364	$	46,181	$	30,526	$	61,215	$	(6,817)	$	139,469


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
	For the Three Months Ended September 30, 2022
Revenues	$	122,660	$	109,565	$	78,260	$	156,015	$	4,834	$	471,334
Expenses	116,661		61,150		42,149		100,876		9,915		330,751
Operating profit (loss)	$	5,999	$	48,415	$	36,111	$	55,139	$	(5,081)	$	140,583

The following tables highlight certain financial information about each of business segment for the nine months ended September 30, 2023 and 2022:


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
	For the Nine Months Ended September 30, 2023
Revenues	$	378,171	$	326,579	$	219,914	$	495,318	$	14,953	$	1,434,935
Expenses	343,442		192,004		126,337		321,705		34,089		1,017,577
Operating profit (loss)	$	34,729	$	134,575	$	93,577	$	173,613	$	(19,136)	$	417,358


	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses		Total
	For the Nine Months Ended September 30, 2022
Revenues	$	460,392	$	341,989	$	248,582	$	468,842	$	14,642	$	1,534,447
Expenses	359,676		189,045		131,432		300,520		34,709		1,015,382
Operating profit (loss)	$	100,716	$	152,944	$	117,150	$	168,322	$	(20,067)	$	519,065

Schedule of Reconciliation of Total Operating Profit Reported for Business Segments to Income from Operations in Consolidated Statements of Operations


	2023		2022
Total operating profit from segments	$	139,469	$	140,583
Corporate overhead expenses (1)	(30,997)		(89,537)
Income from operations	$	108,472	$	51,046

(1) Corporate overhead expenses in 2022 include costs for the Voluntary Separation Program of $56,996.


	2023		2022
Total operating profit from segments	$	417,358	$	519,065
Corporate overhead expenses (1)	(94,518)		(137,360)
Income from operations	$	322,840	$	381,705

(1) Corporate overhead expenses in 2022 include costs for the Voluntary Separation Program of $56,996.

Schedule of Additional Information Pertaining to Business Segments

The following tables provide additional information for the three months ended September 30, 2023 and 2022 pertaining to the business segments:


	Capital Expenditures (2)				Depreciation
	2023		2022		2023		2022
Private Banks	$	7,580	$	8,404	$	5,565	$	5,050
Investment Advisors	3,545		3,476		540		513
Institutional Investors	390		1,080		338		283
Investment Managers	2,804		9,843		2,424		2,498
Investments in New Businesses	222		227		83		36
Total from business segments	$	14,541	$	23,030	$	8,950	$	8,380
Corporate overhead	307		486		247		178
	$	14,848	$	23,516	$	9,197	$	8,558

(2) Capital expenditures include additions to property and equipment and capitalized software.


	Amortization
	2023		2022
Private Banks	$	4,852	$	4,515
Investment Advisors	1,933		1,736
Institutional Investors	1,834		1,808
Investment Managers	959		2,121
Investments in New Businesses	145		145
Total from business segments	$	9,723	$	10,325
Corporate overhead	74		57
	$	9,797	$	10,382

The following tables provide additional information for the nine months ended September 30, 2023 and 2022:


	Capital Expenditures (2)				Depreciation
	2023		2022		2023		2022
Private Banks	$	24,652	$	24,167	$	16,369	$	15,710
Investment Advisors	11,499		9,926		1,557		1,438
Institutional Investors	1,495		3,057		923		857
Investment Managers	10,002		17,980		6,789		6,273
Investments in New Businesses	766		640		214		124
Total from business segments	$	48,414	$	55,770	$	25,852	$	24,402
Corporate Overhead	1,284		1,376		657		540
	$	49,698	$	57,146	$	26,509	$	24,942

(2) Capital expenditures include additions to property and equipment and capitalized software.


	Amortization
	2023		2022
Private Banks	$	14,216	$	21,315
Investment Advisors	5,696		8,127
Institutional Investors	5,487		6,348
Investment Managers	2,815		7,274
Investments in New Businesses	434		515
Total from business segments	$	28,648	$	43,579
Corporate Overhead	203		198
	$	28,851	$	43,777

Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Capital expenditure	$ 14,848	$ 23,516	$ 49,698	$ 57,146
Depreciation	9,197	8,558	26,509	24,942
Amortization	9,797	10,382	28,851	43,777
Operating Segments
Segment Reporting Information [Line Items]
Capital expenditure	14,541	23,030	48,414	55,770
Depreciation	8,950	8,380	25,852	24,402
Amortization	9,723	10,325	28,648	43,579
Operating Segments \| Private Banks
Segment Reporting Information [Line Items]
Capital expenditure	7,580	8,404	24,652	24,167
Depreciation	5,565	5,050	16,369	15,710
Amortization	4,852	4,515	14,216	21,315
Operating Segments \| Investment Advisors
Segment Reporting Information [Line Items]
Capital expenditure	3,545	3,476	11,499	9,926
Depreciation	540	513	1,557	1,438
Amortization	1,933	1,736	5,696	8,127
Operating Segments \| Institutional Investors
Segment Reporting Information [Line Items]
Capital expenditure	390	1,080	1,495	3,057
Depreciation	338	283	923	857
Amortization	1,834	1,808	5,487	6,348
Operating Segments \| Investment Managers
Segment Reporting Information [Line Items]
Capital expenditure	2,804	9,843	10,002	17,980
Depreciation	2,424	2,498	6,789	6,273
Amortization	959	2,121	2,815	7,274
Operating Segments \| Investments In New Businesses
Segment Reporting Information [Line Items]
Capital expenditure	222	227	766	640
Depreciation	83	36	214	124
Amortization	145	145	434	515
Corporate overhead
Segment Reporting Information [Line Items]
Capital expenditure	307	486	1,284	1,376
Depreciation	247	178	657	540
Amortization	$ 74	$ 57	$ 203	$ 198

Composition of Certain Financial Statement Captions (Tables)

9 Months Ended

Sep. 30, 2023

Items Included in Consolidated Statement of Financial Condition [Abstract]

Schedule of Receivables

Receivables on the accompanying Consolidated Balance Sheets consist of:


	September 30, 2023		December 31, 2022
Trade receivables	$	134,646	$	110,722
Fees earned, not billed	356,876		320,700
Other receivables	28,516		26,563
	520,038		457,985
Less: Allowance for doubtful accounts	(1,184)		(901)
	$	518,854	$	457,084

Schedule of Property And Equipment

Property and Equipment on the accompanying Consolidated Balance Sheets consists of:


	September 30, 2023		December 31, 2022
Buildings	$	216,572	$	210,626
Equipment	192,187		179,318
Land	26,450		26,439
Purchased software	164,844		160,714
Furniture and fixtures	22,580		21,956
Leasehold improvements	19,602		20,879
Construction in progress	583		1,958
	642,818		621,890
Less: Accumulated depreciation	(465,297)		(440,861)
Property and Equipment, net	$	177,521	$	181,029

Schedule of Accrued Liabilities

Accrued liabilities on the accompanying Consolidated Balance Sheets consist of:


	September 30, 2023		December 31, 2022
Accrued employee compensation	$	89,229	$	100,566
Accrued employee benefits and other personnel	8,377		9,852
Accrued voluntary separation program	27,777		53,821
Accrued consulting, outsourcing and professional fees	32,928		37,009
Accrued sub-advisory, distribution and other asset management fees	50,346		52,916

Accrued dividend payable	389		58,051

Other accrued liabilities	40,826		47,148
Total accrued liabilities	$	249,872	$	359,363

Goodwill and Intangible Assets (Additional Information) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Goodwill [Line Items]
Payment of contingent consideration	$ 8,799	$ 868
Amortization expense	9,178	9,534
Huntington Steele, LLC
Goodwill [Line Items]
Payment of contingent consideration	$ 8,799	$ 868

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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-Name Accounting Standards Codification
-Section 55
-Paragraph 24
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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+ Details

Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2023

Accounting Policies [Abstract]

Schedule of Calculation of Basic and Diluted Earnings Per Share

The calculations of basic and diluted earnings per share for the three and nine months ended September 30, 2023 and 2022 are:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Net income	$	115,661	$	61,659	$	341,527	$	363,243
Shares used to compute basic earnings per common share	132,231,000		135,203,000		133,035,000		136,524,000
Dilutive effect of stock options	1,273,000		1,142,000		1,215,000		1,434,000
Shares used to compute diluted earnings per common share	133,504,000		136,345,000		134,250,000		137,958,000
Basic earnings per common share	$	0.87	$	0.46	$	2.57	$	2.66
Diluted earnings per common share	$	0.87	$	0.45	$	2.54	$	2.63

Schedule of Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities

The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the nine months ended September 30:


	2023		2022
Net income	$	341,527	$	363,243
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	26,509		24,942
Amortization	28,851		43,777
Equity in earnings of unconsolidated affiliate	(91,517)		(88,926)
Distributions received from unconsolidated affiliate	100,252		103,504
Stock-based compensation	23,458		31,339
Provision for losses on receivables	283		734
Deferred income tax expense	(20,971)		(41,419)
Net (gain) loss from investments	(1,053)		4,515

Change in other long-term liabilities	3,105		3,014
Change in other assets	1,099		(4,820)
Contract costs capitalized, net of amortization	(590)		(1,554)
Other	2,122		(6,934)
Change in current assets and liabilities
(Increase) decrease in
Receivables from investment products	6,327		(32,187)
Receivables	(62,053)		(41,697)
Other current assets	(8,654)		(11,422)
Advances due from unconsolidated affiliate	51,293		54,328
(Decrease) increase in
Accounts payable	(3,085)		(2,103)
Accrued liabilities	(48,128)		27,092
Deferred revenue	(2,793)		3,093
Total adjustments	4,455		65,276
Net cash provided by operating activities	$	345,982	$	428,519

Investment In Unconsolidated Affiliate

9 Months Ended

Sep. 30, 2023

Equity Method Investments and Joint Ventures [Abstract]

Investment In Unconsolidated Affiliate

Investment in Unconsolidated Affiliate

LSV Asset Management

The Company has an investment in LSV Asset Management (LSV), a registered investment advisor that provides investment advisory services primarily to institutions, including pension plans and investment companies. LSV is currently an investment sub-advisor for a limited number of SEI-sponsored investment products. The Company's partnership interest in LSV as of September 30, 2023 was 38.6%. The Company accounts for its interest in LSV using the equity method because of its less than 50% ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations.

At September 30, 2023, the Company’s total investment in LSV was $44,645. The Company receives partnership distributions from LSV on a quarterly basis. The Company received partnership distributions from LSV of $100,252 and $103,504 in the nine months ended September 30, 2023 and 2022, respectively. As such, the Company considers these distribution payments as returns on investment rather than returns of the Company's original investment in LSV and has therefore classified the associated cash inflows as an operating activity on the Consolidated Statements of Cash Flows.

The Company’s proportionate share in the earnings of LSV was $29,927 and $26,654 during the three months ended September 30, 2023 and 2022, respectively. During the nine months ended September 30, 2023 and 2022, the Company's proportionate share in the earnings of LSV was $91,517 and $88,926, respectively.

These tables contain condensed financial information of LSV:


Condensed Statement of Operations	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Revenues	$	102,183	$	91,588	$	309,211	$	299,852
Net income	77,566		69,013		237,119		229,997


Condensed Balance Sheets	September 30, 2023		December 31, 2022
Current assets	$	121,830	$	158,326
Non-current assets	6,662		6,019
Total assets	$	128,492	$	164,345

Current liabilities	$	64,273	$	77,306
Non-current liabilities	2,405		3,050
Partners’ capital	61,814		83,989
Total liabilities and partners’ capital	$	128,492	$	164,345

Investment In Unconsolidated Affiliate (Condensed Statements of Operations of LSV) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]
Revenues	$ 476,759	$ 471,334	$ 1,434,935	$ 1,534,447
Equity Method Investment, Nonconsolidated Investee
Schedule of Equity Method Investments [Line Items]
Revenues	102,183	91,588	309,211	299,852
Net income	$ 77,566	$ 69,013	$ 237,119	$ 229,997

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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Business Segment Information (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Revenues	$ 476,759,000	$ 471,334,000	$ 1,434,935,000	$ 1,534,447,000
Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0

- Definition

+ References

+ Details

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 1,184	$ 901
Property and Equipment, accumulated depreciation	465,297	440,861
Capitalized Software, accumulated amortization	606,214	586,744
Intangible Assets, accumulated amortization	$ 39,432	$ 30,261
Shareholders' Equity:
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares issued (in shares)	131,571,000	134,162,000
Common stock, shares outstanding (in shares)	131,571,000	134,162,000

Composition of Certain Financial Statement Captions (Property And Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Property and Equipment [Line Items]
Property and equipment, gross	$ 642,818		$ 642,818		$ 621,890
Less: Accumulated depreciation	(465,297)		(465,297)		(440,861)
Property and Equipment, net	177,521		177,521		181,029
Depreciation expense	9,197	$ 8,558	26,509	$ 24,942
Buildings
Property and Equipment [Line Items]
Property and equipment, gross	216,572		216,572		210,626
Equipment
Property and Equipment [Line Items]
Property and equipment, gross	192,187		192,187		179,318
Land
Property and Equipment [Line Items]
Property and equipment, gross	26,450		26,450		26,439
Purchased software
Property and Equipment [Line Items]
Property and equipment, gross	164,844		164,844		160,714
Furniture and fixtures
Property and Equipment [Line Items]
Property and equipment, gross	22,580		22,580		21,956
Leasehold improvements
Property and Equipment [Line Items]
Property and equipment, gross	19,602		19,602		20,879
Construction in progress
Property and Equipment [Line Items]
Property and equipment, gross	$ 583		$ 583		$ 1,958

Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Total operating profit from segments	$ 139,469	$ 140,583	$ 417,358	$ 519,065
Corporate overhead expenses	(30,997)	(89,537)
Income from operations	108,472	51,046	322,840	381,705
Compensation, benefits and other personnel	$ 180,470	227,127	529,591	545,532
Operating Segments
Segment Reporting Information [Line Items]
Total operating profit from segments			417,358	519,065
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate overhead expenses			$ (94,518)	(137,360)
Voluntary Seperation Program \| Employee Stock Option
Segment Reporting Information [Line Items]
Compensation, benefits and other personnel		$ 56,996		$ 56,996

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

+ Details

Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

The changes in the carrying amount of the Company's goodwill by segment are as follows:


	Institutional Investors		Investment Managers		Investments in New Businesses		Total

Balance, December 31, 2022	$	47,108	$	56,992	$	11,499	$	115,599

Foreign currency translation adjustments	—		(2)		—		(2)
Balance, September 30, 2023	$	47,108	$	56,990	$	11,499	$	115,597

In April 2018, the Company acquired all ownership interests of Huntington Steele, LLC (Huntington Steele). The total purchase price for Huntington Steele included a contingent purchase price payable to the sellers which is determined at various intervals occurring between 2019 and 2023. In July 2023, the Company exercised its option to settle the contingent consideration. The Company made total payments of $8,799 and $868 during the nine months ended September 30, 2023 and 2022, respectively, to the sellers related to the contingent consideration. As of September 30, 2023, the Company no longer has any obligation for future payments to the sellers related to the acquisition of Huntington Steele.

The Company recognized $9,178 and $9,534 of amortization expense related to acquired intangible assets during the nine months ended September 30, 2023 and 2022, respectively.

Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 476,759	$ 471,334	$ 1,434,935	$ 1,534,447
United States
Disaggregation of Revenue [Line Items]
Revenues	406,184	403,526	1,225,796	1,234,242
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	37,231	36,915	110,840	204,803
Canada
Disaggregation of Revenue [Line Items]
Revenues	11,491	11,852	34,544	37,341
Ireland
Disaggregation of Revenue [Line Items]
Revenues	15,639	14,501	46,324	46,078
Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	6,214	4,507	17,431	11,721
Other
Disaggregation of Revenue [Line Items]
Revenues		33		262
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	104,461	107,066	315,840	342,202
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	104,632	105,427	313,564	328,575
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	157,055	144,517	457,643	435,342
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	61,896	57,818	189,322	170,651
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	28,532	36,468	87,332	109,572
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	4,909	3,993	25,826	101,842
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	15,274	16,045	45,408	46,263
Private Banks
Disaggregation of Revenue [Line Items]
Revenues	121,469	122,660	378,171	460,392
Private Banks \| United States
Disaggregation of Revenue [Line Items]
Revenues	78,306	81,628	249,759	244,472
Private Banks \| United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	28,789	27,186	84,619	171,042
Private Banks \| Canada
Disaggregation of Revenue [Line Items]
Revenues	10,060	10,495	30,297	33,318
Private Banks \| Ireland
Disaggregation of Revenue [Line Items]
Revenues	4,314	3,351	13,496	11,560
Private Banks \| Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Private Banks \| Other
Disaggregation of Revenue [Line Items]
Revenues		0		0
Private Banks \| Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	32,119	30,002	96,432	95,113
Private Banks \| Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	900	633	2,210	1,504
Private Banks \| Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	336	336	1,019	1,040
Private Banks \| Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	60,564	57,818	185,320	170,651
Private Banks \| Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	21,972	29,855	66,913	89,259
Private Banks \| Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	4,539	3,195	23,213	100,020
Private Banks \| Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,039	821	3,064	2,805
Private Banks \| Professional services fees, one-time early termination fees
Disaggregation of Revenue [Line Items]
Revenues			10,457	88,000
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues	110,461	109,565	326,579	341,989
Investment Advisors \| United States
Disaggregation of Revenue [Line Items]
Revenues	110,461	109,565	326,579	341,989
Investment Advisors \| United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Advisors \| Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Advisors \| Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Advisors \| Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investment Advisors \| Other
Disaggregation of Revenue [Line Items]
Revenues		0		0
Investment Advisors \| Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	60,046	63,688	181,754	203,171
Investment Advisors \| Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	45,175	39,915	129,000	122,321
Investment Advisors \| Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	2	0	0	0
Investment Advisors \| Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	1,183	0	3,479	0
Investment Advisors \| Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Advisors \| Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Advisors \| Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	4,055	5,962	12,346	16,497
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues	70,479	78,260	219,914	248,582
Institutional Investors \| United States
Disaggregation of Revenue [Line Items]
Revenues	58,992	65,571	184,332	204,836
Institutional Investors \| United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	8,442	9,729	26,221	33,761
Institutional Investors \| Canada
Disaggregation of Revenue [Line Items]
Revenues	1,431	1,357	4,247	4,023
Institutional Investors \| Ireland
Disaggregation of Revenue [Line Items]
Revenues	1,614	1,570	5,114	5,700
Institutional Investors \| Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Institutional Investors \| Other
Disaggregation of Revenue [Line Items]
Revenues		33		262
Institutional Investors \| Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	11,858	12,928	36,295	42,494
Institutional Investors \| Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	54,317	60,887	169,875	192,559
Institutional Investors \| Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Institutional Investors \| Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	50	0	330	0
Institutional Investors \| Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	2,291	2,650	7,733	8,781
Institutional Investors \| Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Institutional Investors \| Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,963	1,795	5,681	4,748
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues	169,293	156,015	495,318	468,842
Investment Managers \| United States
Disaggregation of Revenue [Line Items]
Revenues	153,368	141,928	450,173	428,303
Investment Managers \| United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Managers \| Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Managers \| Ireland
Disaggregation of Revenue [Line Items]
Revenues	9,711	9,580	27,714	28,818
Investment Managers \| Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	6,214	4,507	17,431	11,721
Investment Managers \| Other
Disaggregation of Revenue [Line Items]
Revenues		0		0
Investment Managers \| Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	87	81	318	288
Investment Managers \| Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Managers \| Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	156,717	144,181	456,624	434,302
Investment Managers \| Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	86	0	160	0
Investment Managers \| Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	4,269	3,963	12,686	11,532
Investment Managers \| Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	370	798	2,613	1,822
Investment Managers \| Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	7,764	6,992	22,917	20,898
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues	5,057	4,834	14,953	14,642
Investments In New Businesses \| United States
Disaggregation of Revenue [Line Items]
Revenues	5,057	4,834	14,953	14,642
Investments In New Businesses \| United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses \| Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses \| Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses \| Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investments In New Businesses \| Other
Disaggregation of Revenue [Line Items]
Revenues		0		0
Investments In New Businesses \| Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	351	367	1,041	1,136
Investments In New Businesses \| Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	4,240	3,992	12,479	12,191
Investments In New Businesses \| Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses \| Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	13	0	33	0
Investments In New Businesses \| Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses \| Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses \| Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	$ 453	$ 475	$ 1,400	$ 1,315

Accumulated Other Comprehensive Loss

9 Months Ended

Sep. 30, 2023

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Loss

The components of Accumulated other comprehensive loss, net of tax, are as follows:


	Foreign Currency Translation Adjustments		Unrealized Gains (Losses) on Investments		Accumulated Other Comprehensive Loss
Balance, January 1, 2023	$	(39,673)	$	(9,294)	$	(48,967)

Other comprehensive loss before reclassifications	249		(1,945)		(1,696)
Amounts reclassified from accumulated other comprehensive loss	—		128		128
Net current-period other comprehensive loss	249		(1,817)		(1,568)

Balance, September 30, 2023	$	(39,424)	$	(11,111)	$	(50,535)