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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2016	Apr. 19, 2016
Document Information [Line Items]
Entity Registrant Name	SEI INVESTMENTS CO
Entity Central Index Key	0000350894
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Trading Symbol	SEIC
Amendment Flag	false
Entity Common Stock, Shares Outstanding		161,993,066

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 638,253	$ 679,661
Restricted cash	5,500	5,500
Receivables from investment products	51,633	48,098
Receivables, net of allowance for doubtful accounts of $700 and $649	229,558	223,023
Securities owned	21,264	21,235
Other current assets	28,829	26,207
Total Current Assets	975,037	1,003,724
Property and Equipment, net of accumulated depreciation of $266,022 and $259,501	141,790	143,977
Capitalized Software, net of accumulated amortization of $270,313 and $259,358	289,044	290,522
Investments Available for Sale	78,356	81,294
Investments in Affiliated Funds, at fair value	4,183	4,039
Investment in Unconsolidated Affiliates	44,247	49,580
Deferred Income Taxes	4,117	0
Other Assets, net	14,072	15,492
Total Assets	1,550,846	1,588,628
Current Liabilities:
Accounts payable	4,354	4,511
Accrued liabilities	165,005	217,587
Deferred revenue	2,936	2,385
Total Current Liabilities	172,295	224,483
Deferred Income Taxes	66,410	63,028
Other Long-term Liabilities	11,676	11,397
Total Liabilities	250,381	298,908
Commitments and Contingencies
SEI Investments shareholders' equity:
Common stock, $.01 par value, 750,000 shares authorized; 161,908 and 163,733 shares issued and outstanding	1,619	1,637
Capital in excess of par value	912,506	910,513
Retained earnings	408,684	402,860
Accumulated other comprehensive loss, net	(22,344)	(25,290)
Total Shareholders' Equity	1,300,465	1,289,720
Total Liabilities and Shareholders' Equity	$ 1,550,846	$ 1,588,628

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current Assets:
Receivables, allowance for doubtful accounts	$ 700	$ 649
Property and Equipment, accumulated depreciation	266,022	259,501
Capitalized Software, accumulated amortization	$ 270,313	$ 259,358
SEI Investments shareholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	161,908,000	163,733,000
Common stock, shares outstanding	161,908,000	163,733,000

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Asset management, administration and distribution fees	$ 251,437	$ 246,768
Information processing and software servicing fees	73,399	70,653
Transaction-based and trade execution fees	9,427	8,023
Total revenues	334,263	325,444
Expenses:
Subadvisory, distribution and other asset management costs	39,195	38,517
Software royalties and other information processing costs	7,748	7,509
Brokerage commissions	7,108	5,972
Compensation, benefits and other personnel	101,931	94,186
Stock-based compensation	3,789	3,750
Consulting, outsourcing and professional fees	38,506	35,628
Data processing and computer related	15,718	13,400
Facilities, supplies and other costs	15,997	17,059
Amortization	11,012	10,358
Depreciation	6,447	5,995
Total expenses	247,451	232,374
Income from operations	86,812	93,070
Net (loss) gain from investments	(126)	250
Interest and dividend income	1,083	969
Interest expense	(114)	(113)
Equity in earnings of unconsolidated affiliates	29,192	34,033
Gain on sale of subsidiary	2,791	2,791
Income before income taxes	119,638	131,000
Income taxes	42,141	46,389
Net income	$ 77,497	$ 84,611
Basic earnings per common share	$ 0.48	$ 0.51
Shares used to compute basic earnings per share	163,013	166,695
Diluted earnings per common share	$ 0.47	$ 0.50
Shares used to compute diluted earnings per share	166,145	170,703

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 77,497	$ 84,611
Other comprehensive gain (loss), net of tax:
Foreign currency translation adjustments	2,429	(8,783)
Unrealized gain (loss) on investments:
Unrealized gains during the period, net of income taxes of $(191) and $(25)	330	7
Less: reclassification adjustment for losses (gains) realized in net income, net of income taxes of $(103) and $52	187	(94)
Unrealized gain (loss) on investments:	517	(87)
Total other comprehensive gain (loss), net of tax	2,946	(8,870)
Comprehensive income	$ 80,443	$ 75,741

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Unrealized gains during the period, income tax benefit (expense)	$ (191)	$ (25)
Reclassification adjustment for losses (gains) realized in net income, income tax (benefit) expense	$ (103)	$ 52

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 77,497	$ 84,611
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1)	524	(6,681)
Net cash provided by operating activities	78,021	77,930
Cash flows from investing activities:
Additions to restricted cash	0	(4)
Additions to property and equipment	(4,609)	(7,386)
Additions to capitalized software	(9,477)	(7,989)
Purchases of marketable securities	(8,652)	(4,107)
Prepayments and maturities of marketable securities	12,090	7,375
Sales of marketable securities	185	0
Receipt of contingent payment from sale of SEI AK	2,791	2,791
Other investing activities	200	(1,000)
Net cash used in investing activities	(7,472)	(10,320)
Cash flows from financing activities:
Purchase and retirement of common stock	(78,372)	(67,534)
Proceeds from issuance of common stock	6,476	19,209
Tax benefit on stock options exercised	624	3,268
Payment of dividends	(42,677)	(40,178)
Net cash used in financing activities	(113,949)	(85,235)
Effect of exchange rate changes on cash and cash equivalents	1,992	(6,561)
Net decrease in cash and cash equivalents	(41,408)	(24,186)
Cash and cash equivalents, beginning of period	679,661	667,446
Cash and cash equivalents, end of period	$ 638,253	$ 643,260

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2016

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Nature of Operations

SEI Investments Company (the Company), a Pennsylvania corporation, provides investment processing, investment management, and investment operations solutions to financial institutions, financial advisors, institutional investors, investment managers and ultra-high-net-worth families in the United States, Canada, the United Kingdom, continental Europe and various other locations throughout the world. Investment processing solutions consist of application and business process outsourcing services, professional services and transaction-based services. Revenues from investment processing solutions are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations, except for fees earned associated with trade execution services which are recognized in Transaction-based and trade execution fees.

Investment management programs consist of mutual funds, alternative investments and separate accounts. These include a series of money market, equity, fixed-income and alternative investment portfolios, primarily in the form of registered investment companies. The Company serves as the administrator and investment advisor for many of these products. Revenues from investment management programs are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Investment operations solutions offer investment managers support for traditional investment products such as mutual funds, collective investment trusts, exchange-traded funds, and institutional and separate accounts, by providing outsourcing services including fund and investment accounting, administration, reconciliation, investor servicing and client reporting. These solutions also provide support to managers focused on alternative investments who manage hedge funds, funds of hedge funds, private equity funds and real estate funds, across registered, partnership and separate account structures domiciled in the United States and overseas. Revenues from investment operations solutions 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 March 31, 2016, the results of operations for the three months ended March 31, 2016 and 2015, and cash flows for the three month periods ended March 31, 2016 and 2015. 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, 2015.

There have been no significant changes in significant accounting policies during the three months ended March 31, 2016 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 with the exception of the adoption of Accounting Standards Update (ASU) No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis (See Note 3) and ASU No. 2015-07, Fair Value Measurement (Topic 820) - Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (See Note 5).

Cash and Cash Equivalents

Cash and cash equivalents includes $402,910 and $448,957 at March 31, 2016 and December 31, 2015, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds. The SEI-sponsored mutual funds are Level 1 assets.

Restricted Cash

Restricted cash includes $5,000 at March 31, 2016 and December 31, 2015 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $500 at March 31, 2016 and December 31, 2015, 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 for broker-dealers.

Capitalized Software

The Company capitalized $9,477 and $7,989 of software development costs during the three months ended March 31, 2016 and 2015, respectively. The Company's software development costs primarily relate to the continued development of the SEI Wealth Platform^SM(the Platform). The Company capitalized $7,645 and $7,330 of software development costs for significant enhancements to the Platform during the three months ended March 31, 2016 and 2015, respectively. As of March 31, 2016, the net book value of the Platform was $282,311. The Platform has an estimated useful life of 15 years and a weighted average remaining life of 6.3 years. Amortization expense for the Platform was $10,955 and $10,301 during the three months ended March 31, 2016 and 2015, respectively. The Company also capitalized $1,832 and $659 of software development costs during the three months ended March 31, 2016 and 2015, respectively, related to new technological capabilities for the Investment Managers segment.

Earnings per Share

The calculations of basic and diluted earnings per share for the three months ended March 31, 2016 and 2015 are:



	For the Three Months Ended March 31, 2016
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	77,497	163,013,000	$	0.48
Dilutive effect of stock options	—		3,132,000
Diluted earnings per common share	$	77,497	166,145,000	$	0.47



	For the Three Months Ended March 31, 2015
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	84,611	166,695,000	$	0.51
Dilutive effect of stock options	—		4,008,000
Diluted earnings per common share	$	84,611	170,703,000	$	0.50

Employee stock options to purchase 10,506,000 and 10,051,000 shares of common stock, with an average exercise price of $34.05 and $30.02, were outstanding during the three months ended March 31, 2016 and 2015, respectively, but not included in the computation of diluted earnings per common share because either the performance conditions have not been satisfied or would have been satisfied if the reporting date was the end of the contingency period or the option’s 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.

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 three months ended March 31:



	2016			2015
Net income	$	77,497		$	84,611
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,447			5,995
Amortization	11,012			10,358
Equity in earnings of unconsolidated affiliates	(29,192		)	(34,033		)
Distributions received from unconsolidated affiliate	34,525			37,003
Stock-based compensation	3,789			3,750
Provision for losses on receivables	51			(117		)
Deferred income tax expense	(1,029		)	(102		)
Gain from sale of SEI AK	(2,791		)	(2,791		)
Net loss (gain) from investments	126			(250		)
Change in other long-term liabilities	279			464
Change in other assets	1,099			100
Other	676			(1,628		)
Change in current asset and liabilities
Decrease (increase) in
Receivables from investment products	(3,535		)	1,387
Receivables	(6,585		)	(6,137		)
Other current assets	(2,622		)	(6,835		)
Increase (decrease) in
Accounts payable	(157		)	(3,902		)
Accrued liabilities	(12,120		)	(11,812		)
Deferred revenue	551			1,869
Total adjustments	524			(6,681		)
Net cash provided by operating activities	$	78,021		$	77,930

New Accounting Pronouncements

On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (ASU 2014-09), requiring an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The updated standard permits the use of either the retrospective or cumulative effect transition method. ASU 2014-09 currently becomes effective for the Company during the first quarter 2018. The Company is currently evaluating the transition method that will be elected and the effect that the updated standard will have on its consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU No. 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net) (ASU 2016-08), that amends the principal versus agent guidance in ASU 2014-09. ASU 2016-08 clarifies that the analysis must focus on whether the entity has control of the goods or services before they are transferred to the customer. ASU 2016-08 also provides additional guidance about how to apply the control principle when services are provided and when goods or services are combined with other goods or services. The effective date of the standard for the Company will coincide with ASU 2014-09 during the first quarter 2018. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures.

In April 2016, the FASB issued ASU No. 2016-10, Identifying Performance Obligations and Licensing (ASU 2016-10) that amends the revenue guidance in ASU 2014-09 on identifying performance obligations and accounting for licenses of intellectual property. ASU 2016-10 changed the FASB's previous proposals on renewals of right-to-use licenses and contractual restrictions. The effective date of the standard for the Company will coincide with ASU 2014-09 during the first quarter 2018. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures.

In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01) that will significantly change the income statement impact of equity investments held by an entity, and the recognition of changes in fair value of financial liabilities when the fair value option is elected. ASU 2016-01 becomes effective for the Company during the first quarter 2018. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures.

In February 2016, the FASB issued ASU No. 2016-02, Leases (ASU 2016-02) requiring lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. For lessees, leases will continue to be classified as either operating or finance leases in the income statement. Lessor accounting is similar to the current model but updated to align with certain changes to the lessee model. Lessors will continue to classify leases as operating, direct financing or sales-type leases. The new standard must be adopted using a modified retrospective transition and requires application of the new guidance at the beginning of the earliest comparative period presented. The updated standard is effective for the Company beginning in the first quarter of 2019. Early adoption is permitted. The Company is currently evaluating the transition method that will be elected and the effect that the updated standard will have on its consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (ASU 2016-09) requiring an entity to record all excess tax benefits and tax deficiencies as an income tax benefit or expense in the income statement. ASU 2016-09 will also require an entity to elect an accounting policy to either estimate the number of forfeitures or account for forfeitures when they occur. ASU 2016-09 becomes effective for the Company during the first quarter 2017. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures.

Reclassifications

Certain prior year amounts have been reclassified to conform to current year presentation.

Investment In Unconsolidated Affiliates

3 Months Ended

Mar. 31, 2016

Equity Method Investments and Joint Ventures [Abstract]

Investment In Unconsolidated Affiliates

Investment in Unconsolidated Affiliates

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 mutual funds. The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliates on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliates on the accompanying Consolidated Statements of Operations.

At March 31, 2016, the Company’s total investment in LSV was $44,247. The Company receives partnership distributions from LSV on a quarterly basis. The Company received partnership distributions from LSV of $34,525 and $37,003 in the three months ended March 31, 2016 and 2015, respectively.

The Company’s proportionate share in the earnings of LSV was $29,192 and $34,345 during the three months ended March 31, 2016 and 2015, respectively.

The following table contains the condensed financial operations of LSV for the three months ended March 31, 2016 and 2015:



	Three Months Ended March 31,
	2016		2015
Revenues	$	92,653	$	105,895
Net income	74,457		87,425

As of March 31, 2016, the Company's total partnership interest in LSV was approximately 39.2 percent. In April 2016, LSV provided an interest in the partnership to select key employees which reduced the ownership percentage of each existing partner on a pro-rata basis. As a result, the Company's total partnership interest in LSV was reduced to approximately 38.9 percent.

Guaranty Agreement with LSV Employee Group III

In October 2012, LSV Employee Group III purchased a portion of the partnership interest of three existing LSV employees for $77,700, of which $69,930 was financed through two syndicated term loan facilities contained in a credit agreement with The PrivateBank and Trust Company. The Company provided an unsecured guaranty for $45,000 of the obligations of LSV Employee Group III to the lenders through a guaranty agreement. The lenders have the right to seek payment from the Company in the event of a default by LSV Employee Group III. LSV agreed to provide an unsecured guaranty for $24,930 of the obligations of LSV Employee Group III to the lenders through a separate guaranty agreement.

The Company’s direct interest in LSV was unchanged as a result of this transaction. The Company has determined that LSV Employee Group III is a VIE; however, the Company is not considered the primary beneficiary because it does not have the power to direct the activities that most significantly impact the economic performance of LSV Employee Group III either directly or through any financial responsibility from the guaranty.

In September 2014, LSV Employee Group III made the final principal payment related to the term loan guaranteed by LSV. As of April 19, 2016, the remaining unpaid principal balance of the term loan guaranteed by the Company was $16,915. LSV Employee Group III has met all financial obligations to date regarding the scheduled repayment of the term loans since origination. The Company, in its capacity as guarantor, currently has no obligation of payment relating to the term loan of LSV Employee Group III and, furthermore, fully expects that LSV Employee Group III will meet all of their future obligations regarding the term loan.

Variable Interest Entities - Investment Products	3 Months Ended
Variable Interest Entities - Investment Products	Mar. 31, 2016
Financial Support for Nonconsolidated Legal Entity [Abstract]
Variable Interest Entities - Investment Products	Variable Interest Entities – Investment Products 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 adopted the amendments contained in ASU No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis (ASU 2015-02) during the first quarter 2016. ASU 2015-02 amends the current guidance for both the VIE and the voting interest entity (VOE) consolidation models. This guidance rescinds the indefinite deferral of the VIE guidance for investment companies that permitted application of the risks and rewards based approach. 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 entities either do not meet the definition of a VIE or the Company does not hold a variable interest in the entities. The entities either qualify for the money market scope exception, or are entities in which the Company’s asset management, distribution, administration and custodial fees are commensurate with the services provided and include fair terms and conditions, or are entities that are limited partnerships which have substantive kick-out rights. The Company acts as a fiduciary and does not hold any other interests other than insignificant seed money investments in the pooled investment vehicles. For this reason, the Company also concluded that it is not required to consolidate the pooled investment vehicles under the VOE 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 $12,477 and $10,719 in fees during the three months ended March 31, 2016 and 2015, respectively.

Composition of Certain Financial Statement Captions

3 Months Ended

Mar. 31, 2016

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:



	March 31, 2016			December 31, 2015
Trade receivables	$	58,817		$	47,179
Fees earned, not billed	162,493			154,919
Other receivables	8,948			21,574
	230,258			223,672
Less: Allowance for doubtful accounts	(700		)	(649		)
	$	229,558		$	223,023

Fees earned, not billed represents receivables 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 a prolonged valuation process which delays billings to clients.

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:



	March 31, 2016			December 31, 2015
Buildings	$	151,623		$	151,604
Equipment	89,605			86,941
Land	10,030			10,003
Purchased software	122,561			122,433
Furniture and fixtures	17,248			16,143
Leasehold improvements	15,756			15,393
Construction in progress	989			961
	407,812			403,478
Less: Accumulated depreciation	(266,022		)	(259,501		)
Property and Equipment, net	$	141,790		$	143,977

The Company recognized $6,447 and $5,995 in depreciation expense related to property and equipment for the three months ended March 31, 2016 and 2015, respectively.

Accrued Liabilities

Accrued liabilities on the accompanying Consolidated Balance Sheets consist of:



	March 31, 2016		December 31, 2015
Accrued employee compensation	$	24,863	$	74,687
Accrued consulting, outsourcing and professional fees	25,999		21,575
Accrued sub-advisory, distribution and other asset management fees	32,837		32,674
Accrued dividend payable	—		42,625
Accrued income taxes	38,492		3,505
Other accrued liabilities	42,814		42,521
Total accrued liabilities	$	165,005	$	217,587

Fair Value Measurements

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

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 Government National Mortgage Association (GNMA) mortgage-backed securities held by the Company's wholly-owned limited purpose federal thrift subsidiary, SEI Private Trust Company (SPTC), Federal Home Loan Bank (FHLB) and other U.S. government agency short-term notes and investment grade commercial paper 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 2020 to 2041.

The Company has retrospectively adopted ASU No. 2015-07, Fair Value Measurement (Topic 820) - Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (ASU 2015-07) during the first quarter 2016 for all periods presented. 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. In accordance with ASU 2015-07, this investment has not been classified in the fair value hierarchy.

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 during the three months ended March 31, 2016 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2015. The Company had no Level 3 financial assets or liabilities at March 31, 2016 or December 31, 2015. There were no transfers of financial assets between levels within the fair value hierarchy during the three months ended March 31, 2016.

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



			Fair Value Measurements at the End of the Reporting Period Using
Assets	March 31, 2016		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Equity available-for-sale securities	$	10,560	$	10,560	$	—
Fixed income available-for-sale securities	67,796		—		67,796
Fixed income securities owned	21,264		—		21,264
Investment funds sponsored by LSV (1)	4,183
	$	103,803	$	10,560	$	89,060



			Fair Value Measurements at the End of the Reporting Period Using
Assets	December 31, 2015		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Equity available-for-sale securities	$	10,657	$	10,657	$	—
Fixed income available-for-sale securities	70,637		—		70,637
Fixed income securities owned	21,235		—		21,235
Investment funds sponsored by LSV (1)	4,039
	$	106,568	$	10,657	$	91,872

(1) The fair value amount presented in this table is intended to permit reconciliation of the fair value hierarchy to the amounts presented on the accompanying Consolidated Balance Sheets.

Marketable Securities

3 Months Ended

Mar. 31, 2016

Marketable Securities [Abstract]

Marketable Securities

Investments Available for Sale

Investments available for sale classified as non-current assets consist of:



	At March 31, 2016
	Cost Amount		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	8,351	$	17	$	(702	)	$	7,666
Equities and other mutual funds	2,755		139		—			2,894
Debt securities	66,784		1,012		—			67,796
	$	77,890	$	1,168	$	(702	)	$	78,356



	At December 31, 2015
	Cost Amount		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	8,474	$	—	$	(742	)	$	7,732
Equities and other mutual funds	2,857		68		—			2,925
Debt securities	70,308		329		—			70,637
	$	81,639	$	397	$	(742	)	$	81,294

Net unrealized gains (losses) at March 31, 2016 and December 31, 2015 were $215 (net of income tax expense of $251) and $(302) (net of income tax benefit of $43), respectively. These net unrealized gains and losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets.

There were gross realized gains of $13 and gross realized losses of $303 from available-for-sale securities during the three months ended March 31, 2016. There were gross realized gains of $288 and gross realized losses of $142 from available-for-sale securities during the three months ended March 31, 2015. Gains and losses from available-for-sale securities, including amounts reclassified from accumulated comprehensive income, 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 investment 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 investment primarily consist of U.S. dollar denominated funds that invest primarily in securities of Canadian, Australian and Japanese companies as well as various other global securities. The underlying securities held by the funds are translated into U.S. dollars within the funds. The funds had a fair value of $4,183 and $4,039 at March 31, 2016 and December 31, 2015, respectively. The Company recognized gross realized gains of $144 and gross realized losses of $69, during the three months ended March 31, 2016 and 2015, 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 and commercial paper 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 $21,264 and $21,235 at March 31, 2016 and December 31, 2015, respectively. There were no material net gains or losses from the change in fair value of the securities during the three months ended March 31, 2016 and 2015.

Lines of Credit	3 Months Ended
Lines of Credit	Mar. 31, 2016
Line of Credit Facility [Abstract]
Lines of Credit	Line of Credit The Company has a five-year $300,000 Credit Agreement (the Credit Facility) with Wells Fargo Bank, National Association, and a syndicate of other lenders. The Credit Facility is scheduled to expire in February 2017, 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 1.25 percent above LIBOR. There is also a commitment fee equal to 0.15 percent per annum on the daily unused portion of the facility. The aggregate amount of the Credit Facility may be increased by an additional $100,000 under certain conditions set forth in the agreement. The Credit Facility contains covenants that restrict the ability of the Company to engage in mergers, consolidations, asset sales, investments, transactions with affiliates, or to incur liens, 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. None of the covenants of the Credit Facility negatively affect the Company’s liquidity or capital resources. Both the interest rate and commitment fee prices may increase if the Company’s leverage ratio reaches certain levels. 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. The Company had no borrowings under the Credit Facility at March 31, 2016. The Company was in compliance with all covenants of the Credit Facility during the three months ended March 31, 2016.

Shareholders' Equity

3 Months Ended

Mar. 31, 2016

Stockholders' Equity Note [Abstract]

Shareholders' Equity

Shareholders’ Equity

Stock-Based Compensation

The Company has only non-qualified stock options outstanding under its equity compensation plans. 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 percent when specified diluted earnings per share targets are achieved, and the remaining 50 percent when secondary, higher specified diluted earnings per share targets are achieved. Options do not vest due to the passage of time but solely as a result of achievement of the financial vesting targets. The amount of stock-based compensation expense is based upon management’s estimate of when the earnings per share targets may be achieved.

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended March 31, 2016 and 2015, respectively, as follows:



	Three Months Ended March 31,
	2016			2015
Stock-based compensation expense	$	3,789		$	3,750
Less: Deferred tax benefit	(1,299		)	(1,308		)
Stock-based compensation expense, net of tax	$	2,490		$	2,442

As of March 31, 2016, there was approximately $53,221 of unrecognized compensation cost remaining, adjusted for estimated forfeitures, related to unvested employee stock options 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 three months ended March 31, 2016 was $3,679. The total options exercisable as of March 31, 2016 had an intrinsic value of $174,765. The total intrinsic value for options exercisable is calculated as the difference between the market value of the Company’s common stock as of March 31, 2016 and the weighted average exercise price of the shares. The market value of the Company’s common stock as of March 31, 2016 was $43.05 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of March 31, 2016 was $21.97. Total options that were outstanding and exercisable as of March 31, 2016 were 18,797,000 and 8,291,000, respectively.

Common Stock Buyback

The Company’s Board of Directors, under multiple authorizations, has authorized the repurchase of the Company’s common stock on the open market or through private transactions. The Company purchased 2,073,000 shares at a total cost of $80,586 during the three months ended March 31, 2016. The cost of stock purchases during the period includes the cost of certain transactions that settled in the following quarter. As of March 31, 2016, the Company had approximately $32,540 of authorization remaining for the purchase of common stock under the program. On April 19, 2016, the Company’s Board of Directors approved an increase in the stock repurchase program by an additional $200,000, increasing the available authorization to approximately $232,540.

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.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

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+ Details

Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2016

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

Accumulated Comprehensive Income (Loss)

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, 2016	$	(24,988	)	$	(302	)	$	(25,290	)

Other comprehensive gain before reclassifications	2,429			330			2,759
Amounts reclassified from accumulated other comprehensive income	—			187			187
Net current-period other comprehensive gain	2,429			517			2,946

Balance, March 31, 2016	$	(22,559	)	$	215		$	(22,344	)

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

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+ Details

Business Segment Information

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Business Segment Information

The Company’s reportable business segments are:

Private Banks – provides investment processing and investment management programs to banks and trust institutions, independent wealth advisers and financial advisors worldwide;

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

Institutional Investors – provides investment management programs and administrative outsourcing solutions to retirement plan sponsors, hospitals and not-for-profit organizations worldwide;

Investment Managers – provides investment operations outsourcing solutions to fund companies, banking institutions and both traditional and non-traditional investment managers worldwide; and

Investments in New Businesses – focuses on providing investment management programs to ultra-high-net-worth families residing in the United States; developing internet-based investment services and advice solutions; entering new markets; and conducting other research and development activities.

The information in the following tables is derived from the Company’s internal financial reporting used for corporate management purposes. There are no inter-segment revenues for the three months ended March 31, 2016 and 2015. Management evaluates Company assets on a consolidated basis during interim periods. 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, 2015.

The following tables highlight certain financial information about each of the Company’s business segments for the three months ended March 31, 2016 and 2015.



	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses			Total
	For the Three Months Ended March 31, 2016
Revenues	$	113,361	$	76,679	$	72,897	$	69,918	$	1,408		$	334,263
Expenses	103,741		44,774		35,382		45,275		5,232			234,404
Operating profit (loss)	$	9,620	$	31,905	$	37,515	$	24,643	$	(3,824	)	$	99,859
Gain on sale of subsidiary	2,791		—		—		—		—			2,791
Segment profit (loss)	$	12,411	$	31,905	$	37,515	$	24,643	$	(3,824	)	$	102,650



	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses			Total
	For the Three Months Ended March 31, 2015
Revenues	$	111,213	$	74,015	$	73,548	$	65,367	$	1,301		$	325,444
Expenses	99,256		39,059		35,211		40,623		4,866			219,015
Operating profit (loss)	$	11,957	$	34,956	$	38,337	$	24,744	$	(3,565	)	$	106,429
Gain on sale of subsidiary	2,791		—		—		—		—			2,791
Segment profit (loss)	$	14,748	$	34,956	$	38,337	$	24,744	$	(3,565	)	$	109,220

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 March 31, 2016 and 2015 is as follows:



	2016			2015
Total operating profit from segments	$	99,859		$	106,429
Corporate overhead expenses	(13,047		)	(13,359		)
Income from operations	$	86,812		$	93,070

The following tables provide additional information for the three months ended March 31, 2016 and 2015 pertaining to our business segments:



	Capital Expenditures (1)				Depreciation
	2016		2015		2016		2015
Private Banks	$	8,712	$	8,502	$	3,181	$	3,097
Investment Advisors	2,852		3,318		976		838
Institutional Investors	796		947		334		303
Investment Managers	1,322		2,048		1,190		999
Investments in New Businesses	94		151		548		563
Total from business segments	$	13,776	$	14,966	$	6,229	$	5,800
Corporate overhead	310		409		218		195
	$	14,086	$	15,375	$	6,447	$	5,995

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



	Amortization
	2016		2015
Private Banks	$	7,711	$	7,251
Investment Advisors	2,553		2,400
Institutional Investors	399		375
Investment Managers	266		250
Investments in New Businesses	26		25
Total from business segments	$	10,955	$	10,301
Corporate overhead	57		57
	$	11,012	$	10,358

- 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.

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+ Details

Income Taxes

3 Months Ended

Mar. 31, 2016

Income Tax Disclosure [Abstract]

Income Taxes

The gross liability for unrecognized tax benefits at March 31, 2016 and December 31, 2015 was $14,990 and $14,517, respectively, exclusive of interest and penalties, of which $13,372 and $12,898 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 March 31, 2016 and December 31, 2015, the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $1,497 and $1,391, respectively.



	March 31, 2016		December 31, 2015
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$	14,990	$	14,517
Interest and penalties on unrecognized benefits	1,497		1,391
Total gross uncertain tax positions	$	16,487	$	15,908
Amount included in Current liabilities	$	4,811	$	4,511
Amount included in Other long-term liabilities	11,676		11,397
	$	16,487	$	15,908

The Company’s effective tax rate was 35.2 percent and 35.4 percent for the three months ended March 31, 2016 and 2015, respectively. The decrease in the tax rate for the three months ended March 31, 2016 was primarily due to the permanent reinstatement of the Research and Development Tax Credit enacted during the fourth quarter 2015. The credit was included in the Company's tax rate in the three months ended March 31, 2016 but was not included in the three months ended March 31, 2015 due to its expired status. The decrease in the Company's tax rate was partially offset by the loss of foreign tax credits.

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 2012 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2008.

The Company estimates it will recognize $4,811 of gross unrecognized tax benefits which is expected to be paid within one year due to 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.

Commitments And Contingencies	3 Months Ended
Commitments And Contingencies	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	Commitments and Contingencies In the normal course of business, the Company is party to various claims and legal proceedings. SEI has been named in six lawsuits filed in Louisiana. Five lawsuits were filed in the 19th Judicial District Court for the Parish of East Baton Rouge. One of the five actions purports to set forth claims on behalf of a class and also names SPTC as a defendant. Two of the other actions also name SPTC as a defendant. All five actions name various defendants in addition to SEI, and, in all five actions, the plaintiffs purport to bring a cause of action against SEI and/or SPTC under the Louisiana Securities Act. Two of the five actions include claims for violations of the Louisiana Racketeering Act and possibly conspiracy. In addition, another group of plaintiffs filed a lawsuit in the 23rd Judicial District Court for the Parish of Ascension against SEI and SPTC and other defendants, asserting claims of negligence, breach of contract, breach of fiduciary duty, violations of the uniform fiduciaries law, negligent misrepresentation, detrimental reliance, violations of the Louisiana Securities Act and Louisiana Racketeering Act, and conspiracy. The underlying allegations in all actions relate to the purported role of SPTC in providing back-office services to Stanford Trust Company. The petitions allege that SEI and SPTC aided and abetted or otherwise participated in the sale of “certificates of deposit” issued by Stanford International Bank. The case filed in Ascension Parish was removed to federal court and transferred by the Judicial Panel on Multidistrict Litigation to the United States District Court for the Northern District of Texas. The schedule for responding to that petition has not yet been established. The plaintiffs in two of the cases filed in East Baton Rouge have granted SEI and SPTC an indefinite extension to respond to the petitions. In a third East Baton Rouge action, brought as a class action, SEI and SPTC filed exceptions, which the Court granted in part, dismissing the claims under the Louisiana Unfair Trade Practices Act. Plaintiffs then filed a motion for class certification, and SEI and SPTC also filed a motion for summary judgment. The Court deferred the motion for summary judgment, stating that the motion would not be set for hearing until after the hearing on class certification. After the Court held a hearing on class certification, it certified a class composed of persons who purchased or renewed any Stanford International Bank certificates of deposit (SIB CDs) in Louisiana between January 1, 2007 and February 13, 2009 or any person for whom the Stanford Trust Company purchased SIB CDs in Louisiana between January 1, 2007 and February 13, 2009. SEI and SPTC filed motions for appeal from the class certification judgments. On February 1, 2013, plaintiffs filed a motion for Leave to File a First Amended and Restated Class Action Petition in which they asked the Court to allow them to amend the petition and add claims against certain of SEI's insurance carriers. On February 5, 2013, the Court granted two of the motions for appeal and the motion for leave to amend. On February 28, 2013, SEI responded to the First Amended and Restated Class Action Petition by seeking dismissal of the action. On March 11, 2013, the newly-added insurance carrier defendants removed the case to the Middle District of Louisiana. SEI notified the Judicial Panel on Multidistrict Litigation (MDL) of this case as a potential tag-along action. Plaintiffs filed a motion to remand the action to state court. On March 25, 2013, SEI filed a motion requesting that the federal court decline to adopt the state court's order regarding class certification, which the court dismissed without prejudice to renew upon a determination of the jurisdictional issue. On August 7, 2013, the MDL Panel transferred the matter against SEI to the Northern District of Texas. On October 1, 2014, SEI filed a renewed motion to dismiss in the Northern District of Texas, and on October 6, 2014, the District Court denied plaintiffs’ motion to remand. On June 17, 2015, the Court denied the motion to dismiss, and on June 24, 2015 set a briefing schedule for SEI and SPTC’s motion challenging the Louisiana court’s decision to certify a class, which motion was filed on July 15, 2015. SEI and SPTC filed their answer on July 1, 2015, and this case is now pending in the Northern District of Texas. On July 15, 2015, SEI and SPTC also filed motions seeking reconsideration of the District Court’s June 17 denial of the motion to dismiss or, in the alternative, seeking leave to pursue an interlocutory appeal of certain elements of the denial, as well as a motion seeking partial judgment on the pleadings pursuant to Federal Rule of Civil Procedure 12(c) with respect to claims brought under Section 712(D) of the Louisiana Securities Law. On September 22, 2015, the District Court granted SEI and SPTC’s motion for reconsideration of the June 17 denial of the motion to dismiss and dismissed plaintiffs’ claims under Section 714(A) of the Louisiana Securities Law, but declined to dismiss, or certify for interlocutory appeal, plaintiffs’ claims under Section 714(B) of the Louisiana Securities Law. On November 4, 2015, the District Court granted SEI and SPTC's motion to dismiss plaintiffs' claims under Section 712(D) of the Louisiana Securities Law. Consequently, the only claims of plaintiffs still pending before the District Court are plaintiffs' claims for secondary liability against SEI and SPTC under Section 714(B) of the Louisiana Securities Law. In the two other cases filed in East Baton Rouge, brought by the same counsel who filed the class action, virtually all of the litigation to date has involved motions practice and appellate litigation regarding the existence of federal subjection matter jurisdiction under the federal Securities Litigation Uniform Standards Act (SLUSA). After the matter was removed to the United States District Court for the Northern District of Texas, that court dismissed the action under SLUSA. The Court of Appeals for the Fifth Circuit reversed that order, and the Supreme Court of the United States affirmed the Court of Appeals judgment on February 26, 2014. The matter was remanded to state court and no material activity has taken place since that date. While the outcome of this litigation is uncertain given its early phase, SEI and SPTC believe that they have valid defenses to plaintiffs' claims and intend to defend the lawsuits vigorously. Because of the uncertainty of the make-up of the classes, the specific theories of liability that may survive a motion for summary judgment or other dispositive motion, the lack of discovery regarding damages, causation, mitigation and other aspects that may ultimately bear upon loss, the Company is not reasonably able to provide an estimate of loss, if any, with respect to the foregoing lawsuits. A lawsuit entitled Steven Curd and Rebel Curd v. SEI Investments Management Corporation was filed against SIMC in the United States District Court for the Eastern District of Pennsylvania on December 11, 2013. On August 28, 2014, the Court granted SIMC’s motion to dismiss the initial complaint in the lawsuit, but also granted plaintiffs leave to amend the complaint. On October 2, 2014, plaintiffs filed an amended complaint. In the amended complaint, SEI Investments Global Funds Services (SGFS) was added as a defendant. The plaintiffs bring the case as a shareholder derivative action against SIMC and SGFS on behalf of certain SEI funds. The claims are based on Section 36(b) of the Investment Company Act of 1940, as amended, which allows shareholders of a mutual fund to sue the investment adviser of the fund or its affiliates for an alleged breach of fiduciary duty with respect to compensation received by the adviser or its affiliates. The plaintiffs have brought the suit against SIMC and SGFS with respect to five specific SEI Funds: the High Yield Bond, Tax-Managed Large Cap, and Tax-Managed Small/Mid Cap Funds, each of which is a series of the SEI Institutional Managed Trust, the Intermediate Term Municipal Fund, which is a series of the SEI Tax Exempt Trust, and the International Equity Fund, which is a series of the SEI Institutional International Trust (the SEI Funds). The plaintiffs seek: (1) damages for the SEI Funds in the amount of the alleged “excessive” fees earned by SIMC and SGFS beginning from the one year period prior to the filing of the lawsuit, plus interest, costs, and fees; (2) orders declaring that SIMC and SGFS allegedly violated Section 36(b) and enjoining SIMC and SGFS from further alleged violations; and (3) rescission of SIMC’s and SGFS’s contracts with the funds, and restitution of all allegedly excessive fees paid beginning from the one year period prior to the filing of the lawsuit, plus interest, costs, and fees. On November 24, 2014, SIMC and SGFS filed a motion to dismiss the amended complaint. On July 13, 2015, the Court denied the motion to dismiss with respect to SIMC, and granted the motion to dismiss with respect to SGFS. On September 18, 2015, plaintiffs filed a second amended complaint reinstating SGFS as a defendant in the case. The parties are currently engaged in discovery, which is expected to be completed in early 2017. While the outcome of this litigation is uncertain given its early phase, SIMC and SGFS believe that they have valid defenses to plaintiffs' claims and intend to defend the lawsuit vigorously, and SIMC and SGFS are not reasonably able to provide an estimate of the ultimate loss, if any, with respect to this lawsuit. On November 26, 2014, a Writ of Summons was issued to two of our subsidiaries, SEI Investments - Global Fund Services Limited (GFSL) and SEI Investments - Trustee & Custodial Services (Ireland) Limited (T&C), to appear before the Court of First Instance Antwerp, Belgium. The plaintiffs in this case allege that through their initial investments in collective investment funds domiciled in Netherlands and subsequent transfer of claim rights to a Belgium domiciled partnership, they are beneficial owners of a portfolio of life settlement policies (the Portfolio) which lapsed due to a failure to make premium payments. The plaintiffs seek to recover jointly and severally from nine defendants including GFSL and T&C, damages of approximately $84 million. GFSL and T&C’s involvement in the litigation appears to arise out of their historical provision of administration and custody services, respectively, to the Strategic Life Settlement Fund PLC, who, together with its managers, appear to be the principal defendants in this claim. On December 4, 2015, the Belgium Court dismissed plaintiff's claims for a lack of jurisdiction. On December 22, 2015, the plaintiffs appealed the dismissal. While the outcome of this action is uncertain given its early phase and the lack of specific theories of liability asserted against GFSL and T&C, each of GFSL and T&C believe that they have valid defenses to plaintiffs’ claims and intend to defend the lawsuit vigorously, and GFSL and T&C are not reasonably able to provide an estimate of the ultimate loss, if any, with respect to this lawsuit.

Sale of SEI Asset Korea	3 Months Ended
Sale of SEI Asset Korea	Mar. 31, 2016
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]
Sale of SEI Asset Korea	Sale of SEI Asset Korea On July 31, 2012, the Company, MetLife International Holdings, Inc. (MetLife) and International Finance Corporation (IFC) entered into a definitive agreement with Baring Asset Management Limited (Barings) to sell all ownership interest in SEI Asset Korea (SEI AK). SEI AK was located in South Korea and provided domestic equity and fixed income investment management services to financial institutions and pension funds. On March 28, 2013, all conditions subject to closing the transaction were satisfied and all ownership interests in SEI AK were transferred to Barings. Under the terms of the agreement, a portion of the purchase price was paid upon closing with up to an additional $11,220 payable to the Company as a contingent purchase price with respect to three one-year periods ending on December 31, 2013, 2014, and 2015 depending upon whether SEI AK achieves specified revenue measures during such periods. The Company recognized pre-tax gains of $2,791, or $0.01 diluted earnings per share, during the three months ended March 31, 2016 and 2015 representing the final annual payments under the terms of the agreement. The Company's gains from the sale of SEI AK are included in Gain on sale of subsidiary on the accompanying Consolidated Statement of Operations.

- Definition

The entire disclosure related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721665-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 5C
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=64862545&loc=SL51724579-110230

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Paragraph 4A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721663-107760

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2941-110230

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 3A
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 5A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721671-107760

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Paragraph 5D
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721677-107760

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760

+ Details

Summary of Significant Accounting Policies (Policy)	3 Months Ended
Summary of Significant Accounting Policies (Policy)	Mar. 31, 2016
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 March 31, 2016, the results of operations for the three months ended March 31, 2016 and 2015, and cash flows for the three month periods ended March 31, 2016 and 2015. 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, 2015. There have been no significant changes in significant accounting policies during the three months ended March 31, 2016 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 with the exception of the adoption of Accounting Standards Update (ASU) No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis (See Note 3) and ASU No. 2015-07, Fair Value Measurement (Topic 820) - Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (See Note 5).
Cash and Cash Equivalents	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.
New Accounting Pronouncements	New Accounting Pronouncements On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (ASU 2014-09), requiring an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The updated standard permits the use of either the retrospective or cumulative effect transition method. ASU 2014-09 currently becomes effective for the Company during the first quarter 2018. The Company is currently evaluating the transition method that will be elected and the effect that the updated standard will have on its consolidated financial statements and related disclosures. In March 2016, the FASB issued ASU No. 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net) (ASU 2016-08), that amends the principal versus agent guidance in ASU 2014-09. ASU 2016-08 clarifies that the analysis must focus on whether the entity has control of the goods or services before they are transferred to the customer. ASU 2016-08 also provides additional guidance about how to apply the control principle when services are provided and when goods or services are combined with other goods or services. The effective date of the standard for the Company will coincide with ASU 2014-09 during the first quarter 2018. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures. In April 2016, the FASB issued ASU No. 2016-10, Identifying Performance Obligations and Licensing (ASU 2016-10) that amends the revenue guidance in ASU 2014-09 on identifying performance obligations and accounting for licenses of intellectual property. ASU 2016-10 changed the FASB's previous proposals on renewals of right-to-use licenses and contractual restrictions. The effective date of the standard for the Company will coincide with ASU 2014-09 during the first quarter 2018. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures. In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01) that will significantly change the income statement impact of equity investments held by an entity, and the recognition of changes in fair value of financial liabilities when the fair value option is elected. ASU 2016-01 becomes effective for the Company during the first quarter 2018. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU No. 2016-02, Leases (ASU 2016-02) requiring lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. For lessees, leases will continue to be classified as either operating or finance leases in the income statement. Lessor accounting is similar to the current model but updated to align with certain changes to the lessee model. Lessors will continue to classify leases as operating, direct financing or sales-type leases. The new standard must be adopted using a modified retrospective transition and requires application of the new guidance at the beginning of the earliest comparative period presented. The updated standard is effective for the Company beginning in the first quarter of 2019. Early adoption is permitted. The Company is currently evaluating the transition method that will be elected and the effect that the updated standard will have on its consolidated financial statements and related disclosures. In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (ASU 2016-09) requiring an entity to record all excess tax benefits and tax deficiencies as an income tax benefit or expense in the income statement. ASU 2016-09 will also require an entity to elect an accounting policy to either estimate the number of forfeitures or account for forfeitures when they occur. ASU 2016-09 becomes effective for the Company during the first quarter 2017. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures.
Reclassifications	Reclassifications Certain prior year amounts have been reclassified to conform to current year presentation.
Equity Method Investments	The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliates on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliates on the accompanying Consolidated Statements of Operations.
Variable Interest Entities	The Company has adopted the amendments contained in ASU No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis (ASU 2015-02) during the first quarter 2016. ASU 2015-02 amends the current guidance for both the VIE and the voting interest entity (VOE) consolidation models. This guidance rescinds the indefinite deferral of the VIE guidance for investment companies that permitted application of the risks and rewards based approach. 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 entities either do not meet the definition of a VIE or the Company does not hold a variable interest in the entities. The entities either qualify for the money market scope exception, or are entities in which the Company’s asset management, distribution, administration and custodial fees are commensurate with the services provided and include fair terms and conditions, or are entities that are limited partnerships which have substantive kick-out rights. The Company acts as a fiduciary and does not hold any other interests other than insignificant seed money investments in the pooled investment vehicles. For this reason, the Company also concluded that it is not required to consolidate the pooled investment vehicles under the VOE model.
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 Government National Mortgage Association (GNMA) mortgage-backed securities held by the Company's wholly-owned limited purpose federal thrift subsidiary, SEI Private Trust Company (SPTC), Federal Home Loan Bank (FHLB) and other U.S. government agency short-term notes and investment grade commercial paper 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 2020 to 2041. The Company has retrospectively adopted ASU No. 2015-07, Fair Value Measurement (Topic 820) - Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (ASU 2015-07) during the first quarter 2016 for all periods presented. 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. In accordance with ASU 2015-07, this investment has not been classified in the fair value hierarchy. 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 during the three months ended March 31, 2016 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2015.
Available-for-sale Securities	These net unrealized gains and losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets.
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. In accordance with ASU 2015-07, this investment has not been classified in the fair value hierarchy.
Securities Owned	The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency and commercial paper 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.

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2016

Accounting Policies [Abstract]

Calculation Of Basic And Diluted Earnings Per Share

The calculations of basic and diluted earnings per share for the three months ended March 31, 2016 and 2015 are:



	For the Three Months Ended March 31, 2016
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	77,497	163,013,000	$	0.48
Dilutive effect of stock options	—		3,132,000
Diluted earnings per common share	$	77,497	166,145,000	$	0.47



	For the Three Months Ended March 31, 2015
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	84,611	166,695,000	$	0.51
Dilutive effect of stock options	—		4,008,000
Diluted earnings per common share	$	84,611	170,703,000	$	0.50

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 three months ended March 31:



	2016			2015
Net income	$	77,497		$	84,611
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,447			5,995
Amortization	11,012			10,358
Equity in earnings of unconsolidated affiliates	(29,192		)	(34,033		)
Distributions received from unconsolidated affiliate	34,525			37,003
Stock-based compensation	3,789			3,750
Provision for losses on receivables	51			(117		)
Deferred income tax expense	(1,029		)	(102		)
Gain from sale of SEI AK	(2,791		)	(2,791		)
Net loss (gain) from investments	126			(250		)
Change in other long-term liabilities	279			464
Change in other assets	1,099			100
Other	676			(1,628		)
Change in current asset and liabilities
Decrease (increase) in
Receivables from investment products	(3,535		)	1,387
Receivables	(6,585		)	(6,137		)
Other current assets	(2,622		)	(6,835		)
Increase (decrease) in
Accounts payable	(157		)	(3,902		)
Accrued liabilities	(12,120		)	(11,812		)
Deferred revenue	551			1,869
Total adjustments	524			(6,681		)
Net cash provided by operating activities	$	78,021		$	77,930

Investment In Unconsolidated Affiliates (Tables)

3 Months Ended

Mar. 31, 2016

Equity Method Investments and Joint Ventures [Abstract]

Condensed Statement of Operations of LSV

The following table contains the condensed financial operations of LSV for the three months ended March 31, 2016 and 2015:



	Three Months Ended March 31,
	2016		2015
Revenues	$	92,653	$	105,895
Net income	74,457		87,425

Composition of Certain Financial Statement Captions (Tables)

3 Months Ended

Mar. 31, 2016

Items Included in Consolidated Statement of Financial Condition [Abstract]

Receivables

Receivables on the accompanying Consolidated Balance Sheets consist of:



	March 31, 2016			December 31, 2015
Trade receivables	$	58,817		$	47,179
Fees earned, not billed	162,493			154,919
Other receivables	8,948			21,574
	230,258			223,672
Less: Allowance for doubtful accounts	(700		)	(649		)
	$	229,558		$	223,023

Property And Equipment

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



	March 31, 2016			December 31, 2015
Buildings	$	151,623		$	151,604
Equipment	89,605			86,941
Land	10,030			10,003
Purchased software	122,561			122,433
Furniture and fixtures	17,248			16,143
Leasehold improvements	15,756			15,393
Construction in progress	989			961
	407,812			403,478
Less: Accumulated depreciation	(266,022		)	(259,501		)
Property and Equipment, net	$	141,790		$	143,977

Accrued Liabilities

Accrued liabilities on the accompanying Consolidated Balance Sheets consist of:



	March 31, 2016		December 31, 2015
Accrued employee compensation	$	24,863	$	74,687
Accrued consulting, outsourcing and professional fees	25,999		21,575
Accrued sub-advisory, distribution and other asset management fees	32,837		32,674
Accrued dividend payable	—		42,625
Accrued income taxes	38,492		3,505
Other accrued liabilities	42,814		42,521
Total accrued liabilities	$	165,005	$	217,587

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Of Certain Financial Assets And Liabilities

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



			Fair Value Measurements at the End of the Reporting Period Using
Assets	March 31, 2016		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Equity available-for-sale securities	$	10,560	$	10,560	$	—
Fixed income available-for-sale securities	67,796		—		67,796
Fixed income securities owned	21,264		—		21,264
Investment funds sponsored by LSV (1)	4,183
	$	103,803	$	10,560	$	89,060



			Fair Value Measurements at the End of the Reporting Period Using
Assets	December 31, 2015		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Equity available-for-sale securities	$	10,657	$	10,657	$	—
Fixed income available-for-sale securities	70,637		—		70,637
Fixed income securities owned	21,235		—		21,235
Investment funds sponsored by LSV (1)	4,039
	$	106,568	$	10,657	$	91,872

(1) The fair value amount presented in this table is intended to permit reconciliation of the fair value hierarchy to the amounts presented on the accompanying Consolidated Balance Sheets.

Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2016

Marketable Securities [Abstract]

Investments Available For Sale

Investments available for sale classified as non-current assets consist of:



	At March 31, 2016
	Cost Amount		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	8,351	$	17	$	(702	)	$	7,666
Equities and other mutual funds	2,755		139		—			2,894
Debt securities	66,784		1,012		—			67,796
	$	77,890	$	1,168	$	(702	)	$	78,356



	At December 31, 2015
	Cost Amount		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	8,474	$	—	$	(742	)	$	7,732
Equities and other mutual funds	2,857		68		—			2,925
Debt securities	70,308		329		—			70,637
	$	81,639	$	397	$	(742	)	$	81,294

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2016

Stockholders' Equity Note [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended March 31, 2016 and 2015, respectively, as follows:



	Three Months Ended March 31,
	2016			2015
Stock-based compensation expense	$	3,789		$	3,750
Less: Deferred tax benefit	(1,299		)	(1,308		)
Stock-based compensation expense, net of tax	$	2,490		$	2,442

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2016

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, 2016	$	(24,988	)	$	(302	)	$	(25,290	)

Other comprehensive gain before reclassifications	2,429			330			2,759
Amounts reclassified from accumulated other comprehensive income	—			187			187
Net current-period other comprehensive gain	2,429			517			2,946

Balance, March 31, 2016	$	(22,559	)	$	215		$	(22,344	)

Business Segment Information (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting Information [Line Items]

Schedule Of Financial Information About Business Segments

The following tables highlight certain financial information about each of the Company’s business segments for the three months ended March 31, 2016 and 2015.



	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses			Total
	For the Three Months Ended March 31, 2016
Revenues	$	113,361	$	76,679	$	72,897	$	69,918	$	1,408		$	334,263
Expenses	103,741		44,774		35,382		45,275		5,232			234,404
Operating profit (loss)	$	9,620	$	31,905	$	37,515	$	24,643	$	(3,824	)	$	99,859
Gain on sale of subsidiary	2,791		—		—		—		—			2,791
Segment profit (loss)	$	12,411	$	31,905	$	37,515	$	24,643	$	(3,824	)	$	102,650



	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses			Total
	For the Three Months Ended March 31, 2015
Revenues	$	111,213	$	74,015	$	73,548	$	65,367	$	1,301		$	325,444
Expenses	99,256		39,059		35,211		40,623		4,866			219,015
Operating profit (loss)	$	11,957	$	34,956	$	38,337	$	24,744	$	(3,565	)	$	106,429
Gain on sale of subsidiary	2,791		—		—		—		—			2,791
Segment profit (loss)	$	14,748	$	34,956	$	38,337	$	24,744	$	(3,565	)	$	109,220

Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations



	2016			2015
Total operating profit from segments	$	99,859		$	106,429
Corporate overhead expenses	(13,047		)	(13,359		)
Income from operations	$	86,812		$	93,070

Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table Text Block]

The following tables provide additional information for the three months ended March 31, 2016 and 2015 pertaining to our business segments:



	Capital Expenditures (1)				Depreciation
	2016		2015		2016		2015
Private Banks	$	8,712	$	8,502	$	3,181	$	3,097
Investment Advisors	2,852		3,318		976		838
Institutional Investors	796		947		334		303
Investment Managers	1,322		2,048		1,190		999
Investments in New Businesses	94		151		548		563
Total from business segments	$	13,776	$	14,966	$	6,229	$	5,800
Corporate overhead	310		409		218		195
	$	14,086	$	15,375	$	6,447	$	5,995

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



	Amortization
	2016		2015
Private Banks	$	7,711	$	7,251
Investment Advisors	2,553		2,400
Institutional Investors	399		375
Investment Managers	266		250
Investments in New Businesses	26		25
Total from business segments	$	10,955	$	10,301
Corporate overhead	57		57
	$	11,012	$	10,358

Income Taxes (Tables)

3 Months Ended

Mar. 31, 2016

Income Tax Disclosure [Abstract]

Schedule Of Interest And Penalties



	March 31, 2016		December 31, 2015
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$	14,990	$	14,517
Interest and penalties on unrecognized benefits	1,497		1,391
Total gross uncertain tax positions	$	16,487	$	15,908
Amount included in Current liabilities	$	4,811	$	4,511
Amount included in Other long-term liabilities	11,676		11,397
	$	16,487	$	15,908

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Cash and cash equivalents invested in SEI-sponsored money market funds	$ 638,253	$ 643,260	$ 679,661	$ 667,446
Restricted cash	5,500		5,500
Capitalized software development costs	9,477	$ 7,989
Net book value of SEI Wealth Platform	$ 289,044		290,522
Anti-dilutive employee stock options	10,506	10,051
Antidilutive securities excluded from computation of net income, per outstanding unit, amount	$ 34.05	$ 30.02
SEI Investments Distribution Co. (SIDCO) [Member]
Restricted cash	$ 500		500
SEI Investments (Europe) Limited [Member]
Restricted cash	5,000		5,000
SEI-Sponsored Open-Ended Money Market Mutual Funds [Member]
Cash and cash equivalents invested in SEI-sponsored money market funds	402,910		$ 448,957
SEI Wealth Platform [Member]
Capitalized software development costs	7,645	$ 7,330
Net book value of SEI Wealth Platform	$ 282,311
Estimated useful life of the SEI Wealth Platform	15 years
Amortization expense related to the SEI Wealth Platform	$ 10,955	10,301
Technological capabilities for Investment Managers segment [Member]
Capitalized software development costs	$ 1,832	$ 659
Weighted Average [Member] \| SEI Wealth Platform [Member]
Estimated useful life of the SEI Wealth Platform	6 years 3 months

Summary of Significant Accounting Policies (Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accounting Policies [Abstract]
Basic earnings per common share, Income (Numerator)	$ 77,497	$ 84,611
Shares used to compute basic earnings per share	163,013	166,695
Basic earnings per common share	$ 0.48	$ 0.51
Dilutive effect of stock options, income	$ 0	$ 0
Dilutive effect of stock options, shares	3,132	4,008
Diluted earnings per common share, Income (Numerator)	$ 77,497	$ 84,611
Shares used to compute diluted earnings per share	166,145	170,703
Diluted earnings per common share	$ 0.47	$ 0.50

Summary of Significant Accounting Policies (Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accounting Policies [Abstract]
Net income	$ 77,497	$ 84,611
Depreciation	6,447	5,995
Amortization	11,012	10,358
Equity in earnings of unconsolidated affiliates	(29,192)	(34,033)
Distributions received from unconsolidated affiliate	34,525	37,003
Stock-based compensation	3,789	3,750
Provision for losses on receivables	51	(117)
Deferred income tax expense	(1,029)	(102)
Gain on sale of SEI AK	(2,791)	(2,791)
Net loss (gain) from investments	126	(250)
Change in other long-term liabilities	279	464
Change in other assets	1,099	100
Other	676	(1,628)
Decrease (increase) in Receivables from investment products	(3,535)	1,387
Decrease (increase) in Receivables	(6,585)	(6,137)
Decrease (increase) in Other current assets	(2,622)	(6,835)
Increase (decrease) in Accounts payable	(157)	(3,902)
Increase (decrease) in Accrued liabilities	(12,120)	(11,812)
Increase (decrease) in Deferred revenue	551	1,869
Total adjustments	524	(6,681)
Net cash provided by operating activities	$ 78,021	$ 77,930

Investment In Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Apr. 19, 2016	Oct. 31, 2012
Investments in and Advances to Affiliates [Line Items]
Distributions received from unconsolidated affiliate	$ 34,525	$ 37,003
Company's share in the earnings of equity method investee	$ 29,192	34,033
LSV Employee Group III [Member]
Investments in and Advances to Affiliates [Line Items]
Purchase of partnership interest value				$ 77,700
Amount of purchase price financed through term loans				69,930
Financial Guarantee [Member] \| L S V Asset Management [Member]
Investments in and Advances to Affiliates [Line Items]
Amount of guarantor's obligation, maximum exposure				24,930
Financial Guarantee [Member] \| LSV Employee Group III [Member]
Investments in and Advances to Affiliates [Line Items]
Amount of guarantor's obligation, maximum exposure				$ 45,000
Financial Guarantee [Member] \| LSV Employee Group III [Member] \| Subsequent Event [Member]
Investments in and Advances to Affiliates [Line Items]
Amount of guarantor's obligation, maximum exposure			$ 16,915
Amount of guarantor's obligation, current carrying value			$ 0
L S V Asset Management [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage	39.20%
Total investment in equity method investee	$ 44,247
Distributions received from unconsolidated affiliate	34,525	37,003
Company's share in the earnings of equity method investee	$ 29,192	$ 34,345
L S V Asset Management [Member] \| Subsequent Event [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage			38.90%
Maximum [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage	50.00%

Investment In Unconsolidated Affiliates (Condensed Statement Of Operations Of LSV) (Details) - L S V Asset Management [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]
Revenue of LSV Asset Management	$ 92,653	$ 105,895
Net income of LSV Asset Management	$ 74,457	$ 87,425

Variable Interest Entities - Investment Products (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
SEI-Sponsored Open-Ended Money Market Mutual Funds [Member]
Financial Support for Nonconsolidated Legal Entity [Line Items]
Fees waived according to expense lmitation agreements	$ 12,477	$ 10,719

Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Items Included in Consolidated Statement of Financial Condition [Abstract]
Trade receivables	$ 58,817	$ 47,179
Fees earned, not billed	162,493	154,919
Other receivables	8,948	21,574
Receivables, Gross, Current	230,258	223,672
Less: Allowance for doubtful accounts	(700)	(649)
Receivables, net	$ 229,558	$ 223,023

Composition of Certain Financial Statement Captions (Property And Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 407,812		$ 403,478
Less: Accumulated depreciation	(266,022)		(259,501)
Property and Equipment, net	141,790		143,977
Depreciation expense	6,447	$ 5,995
Building [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	151,623		151,604
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	89,605		86,941
Land [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	10,030		10,003
Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	122,561		122,433
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	17,248		16,143
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	15,756		15,393
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 989		$ 961

Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 24,863	$ 74,687
Accrued consulting, outsourcing and professional fees	25,999	21,575
Accrued sub-advisory, distribution and other asset management fees	32,837	32,674
Accrued dividend payable	0	42,625
Accrued income taxes	38,492	3,505
Other accrued liabilities	42,814	42,521
Total accrued liabilities	$ 165,005	$ 217,587

Fair Value Measurements (Fair Value Of Certain Financial Assets And Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	$ 10,560	$ 10,657
Fixed income available-for-sale securities	67,796	70,637
Fixed income securities owned	21,264	21,235
Investment funds sponsored by LSV	4,183	4,039
Assets, fair value	103,803	106,568
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	10,560	10,657
Fixed income available-for-sale securities	0	0
Fixed income securities owned	0	0
Assets, fair value	10,560	10,657
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	0	0
Fixed income available-for-sale securities	67,796	70,637
Fixed income securities owned	21,264	21,235
Assets, fair value	$ 89,060	$ 91,872

Marketable Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule of Investments [Line Items]
Net unrealized gains (losses)	$ 215		$ (302)
Unrealized gains (losses) during the period, income tax expense (benefit)	251		(43)
Available-for-sale securities, gross realized gains	13	$ 288
Available-for-sale securities, gross realized losses	303	142
Investment funds sponsored by LSV	4,183		4,039
Securities owned	21,264		21,235
Private Equity Funds, Foreign [Member]
Schedule of Investments [Line Items]
Investment funds sponsored by LSV	4,183		$ 4,039
Realized gains (losses) from investment funds sponsored by LSV	$ 144	$ (69)

Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	$ 77,890	$ 81,639
Available-for-sale securities, accumulated gross unrealized gain, before tax	1,168	397
Available-for-sale securities, accumulated gross unrealized loss, before tax	(702)	(742)
Available-for-sale securities, fair value	78,356	81,294
SEI-Sponsored Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	8,351	8,474
Available-for-sale securities, accumulated gross unrealized gain, before tax	17	0
Available-for-sale securities, accumulated gross unrealized loss, before tax	(702)	(742)
Available-for-sale securities, fair value	7,666	7,732
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	2,755	2,857
Available-for-sale securities, accumulated gross unrealized gain, before tax	139	68
Available-for-sale securities, accumulated gross unrealized loss, before tax	0	0
Available-for-sale securities, fair value	2,894	2,925
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	66,784	70,308
Available-for-sale securities, accumulated gross unrealized gain, before tax	1,012	329
Available-for-sale securities, accumulated gross unrealized loss, before tax	0	0
Available-for-sale securities, fair value	$ 67,796	$ 70,637

Lines of Credit (Details) - Line of Credit [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Debt Instrument, Term	5 years
Credit facility maximum borrowing capacity	$ 300,000
Credit facility expiration date	Feb. 02, 2017
Credit facility commitment fee per annum on daily unused portion	0.15%
Aggregate amount that may increase under credit facility	$ 100,000
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.25%

Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Apr. 19, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 53,221
Total intrinsic value of options exercised	3,679
Aggregate intrinsic value of options exercisable	$ 174,765
Market value of Company's common stock	$ 43.05
Weighted average exercise price per share	$ 21.97
Total options that were outstanding	18,797
Total options that were exercisable	8,291
Common Stock Buyback [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased and retired	2,073
Company purchased, cost	$ 80,586
Remaining stock repurchase authorization amount	$ 32,540
2014 Plan [Member] \| Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate	50.00%
2014 Plan [Member] \| Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate	50.00%
Subsequent Event [Member] \| Common Stock Buyback [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining stock repurchase authorization amount		$ 232,540
Increase in authorization for stock repurchase plan		$ 200,000

Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 3,789	$ 3,750
Less: Deferred tax benefit	(1,299)	(1,308)
Stock-based compensation expense, net of tax	$ 2,490	$ 2,442

Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (25,290)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	2,759
Amounts reclassified from accumulated other comprehensive income	187
Net current-period other comprehensive gain	2,946
Ending balance	(22,344)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(24,988)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	2,429
Amounts reclassified from accumulated other comprehensive income	0
Net current-period other comprehensive gain	2,429
Ending balance	(22,559)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(302)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	330
Amounts reclassified from accumulated other comprehensive income	187
Net current-period other comprehensive gain	517
Ending balance	$ 215

Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 334,263	$ 325,444
Expenses	234,404	219,015
Operating profit (loss)	99,859	106,429
Gain on sale of subsidiary	2,791	2,791
Segment profit (loss)	102,650	109,220
Private Banks [Member]
Segment Reporting Information [Line Items]
Revenues	113,361	111,213
Expenses	103,741	99,256
Operating profit (loss)	9,620	11,957
Gain on sale of subsidiary	2,791	2,791
Segment profit (loss)	12,411	14,748
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Revenues	76,679	74,015
Expenses	44,774	39,059
Operating profit (loss)	31,905	34,956
Gain on sale of subsidiary	0	0
Segment profit (loss)	31,905	34,956
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Revenues	72,897	73,548
Expenses	35,382	35,211
Operating profit (loss)	37,515	38,337
Gain on sale of subsidiary	0	0
Segment profit (loss)	37,515	38,337
Investment Managers [Member]
Segment Reporting Information [Line Items]
Revenues	69,918	65,367
Expenses	45,275	40,623
Operating profit (loss)	24,643	24,744
Gain on sale of subsidiary	0	0
Segment profit (loss)	24,643	24,744
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Revenues	1,408	1,301
Expenses	5,232	4,866
Operating profit (loss)	(3,824)	(3,565)
Gain on sale of subsidiary	0	0
Segment profit (loss)	$ (3,824)	$ (3,565)

Business Segment Information (Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Total operating profit from segments above	$ 99,859	$ 106,429
Income from operations	86,812	93,070
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total operating profit from segments above	99,859	106,429
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Corporate overhead expenses	$ (13,047)	$ (13,359)

Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Capital Expenditures	$ 14,086	$ 15,375
Depreciation	6,447	5,995
Amortization	11,012	10,358
Private Banks [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	8,712	8,502
Depreciation	3,181	3,097
Amortization	7,711	7,251
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	2,852	3,318
Depreciation	976	838
Amortization	2,553	2,400
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	796	947
Depreciation	334	303
Amortization	399	375
Investment Managers [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	1,322	2,048
Depreciation	1,190	999
Amortization	266	250
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	94	151
Depreciation	548	563
Amortization	26	25
Total From Business Segments [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	13,776	14,966
Depreciation	6,229	5,800
Amortization	10,955	10,301
Corporate Overhead [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	310	409
Depreciation	218	195
Amortization	$ 57	$ 57

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 14,990		$ 14,517
Unrecognized tax benefits that would affect effective tax rate	13,372		12,898
Interest and penalties on unrecognized benefits	$ 1,497		$ 1,391
Effective tax rates	35.20%	35.40%
Settlement and Lapse of Statute [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits within the next twelve months	$ 4,811

Income Taxes (Interest And Penalties) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 14,990	$ 14,517
Interest and penalties on unrecognized benefits	1,497	1,391
Gross uncertain tax positions	16,487	15,908
Amount included in Current liabilities	4,811	4,511
Amount included in Other long-term liabilities	$ 11,676	$ 11,397

Sale of SEI Asset Korea (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 28, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of subsidiary	$ 2,791	$ 2,791
SEI Asset Korea Co., Ltd. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent purchase price from sale of SEI AK			$ 11,220
Gain on sale of subsidiary	$ 2,791	$ 2,791
Gain on sale of subsidiary, diluted earnings per share impact, net	$ 0.01	$ 0.01

- Definition

The amount of net income (loss) for the period attributable to extraordinary items that is 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(14))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(19))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(16))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1311-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(23))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(18))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(21))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details