SEI Investments (SEIC) 10-Q 21 Oct 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 13, 2016
Document Information [Line Items]
Entity Registrant Name	SEI INVESTMENTS COMPANY
Entity Central Index Key	350,894
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Trading Symbol	SEIC
Amendment Flag	false
Entity Common Stock, Shares Outstanding		159,998,883

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 623,162	$ 679,661
Restricted cash	5,500	5,500
Receivables from investment products	48,783	48,098
Receivables, net of allowance for doubtful accounts of $987 and $649	247,724	223,023
Securities owned	21,320	21,235
Other current assets	30,279	26,207
Total Current Assets	976,768	1,003,724
Property and Equipment, net of accumulated depreciation of $278,675 and $259,501	149,262	143,977
Capitalized Software, net of accumulated amortization of $292,745 and $259,358	290,329	290,522
Investments Available for Sale	93,157	81,294
Investments in Affiliated Funds, at fair value	4,888	4,039
Investment in Unconsolidated Affiliates	39,376	49,580
Deferred Income Taxes	3,722	0
Other Assets, net	16,064	15,492
Total Assets	1,573,566	1,588,628
Current Liabilities:
Accounts payable	7,008	4,511
Accrued liabilities	170,753	217,587
Deferred revenue	2,974	2,385
Total Current Liabilities	180,735	224,483
Deferred Income Taxes	65,518	63,028
Other Long-term Liabilities	14,103	11,397
Total Liabilities	260,356	298,908
Commitments and Contingencies
SEI Investments shareholders' equity:
Common stock, $.01 par value, 750,000 shares authorized; 159,954 and 163,733 shares issued and outstanding	1,600	1,637
Capital in excess of par value	941,370	910,513
Retained earnings	400,778	402,860
Accumulated other comprehensive loss, net	(30,538)	(25,290)
Total Shareholders' Equity	1,313,210	1,289,720
Total Liabilities and Shareholders' Equity	$ 1,573,566	$ 1,588,628

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current Assets:
Receivables, allowance for doubtful accounts	$ 987	$ 649
Property and Equipment, accumulated depreciation	278,675	259,501
Capitalized Software, accumulated amortization	$ 292,745	$ 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	159,954,000	163,733,000
Common stock, shares outstanding	159,954,000	163,733,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Asset management, administration and distribution fees	$ 271,930	$ 252,585	$ 785,642	$ 756,101
Information processing and software servicing fees	76,443	74,413	224,834	218,765
Transaction-based and trade execution fees	6,268	8,624	22,259	23,945
Total revenues	354,641	335,622	1,032,735	998,811
Expenses:
Subadvisory, distribution and other asset management costs	42,586	40,230	122,651	119,619
Software royalties and other information processing costs	7,519	8,028	22,944	23,594
Brokerage commissions	4,864	6,460	17,065	17,863
Compensation, benefits and other personnel	103,137	99,461	307,350	292,646
Stock-based compensation	4,066	3,867	12,044	11,476
Consulting, outsourcing and professional fees	43,631	35,963	121,712	108,560
Data processing and computer related	16,581	15,173	48,081	43,100
Facilities, supplies and other costs	17,075	22,477	50,194	56,195
Amortization	11,388	10,837	33,684	31,806
Depreciation	6,576	6,108	19,457	17,946
Total expenses	257,423	248,604	755,182	722,805
Income from operations	97,218	87,018	277,553	276,006
Net gain (loss) from investments	196	(756)	320	(544)
Interest and dividend income	1,026	846	3,142	2,570
Interest expense	(115)	(115)	(416)	(342)
Equity in earnings of unconsolidated affiliates	32,565	33,595	92,042	104,917
Gain on sale of subsidiary	0	0	2,791	2,791
Income before income taxes	130,890	120,588	375,432	385,398
Income taxes	44,186	41,163	130,226	135,122
Net income	$ 86,704	$ 79,425	$ 245,206	$ 250,276
Basic earnings per common share	$ 0.54	$ 0.48	$ 1.51	$ 1.51
Shares used to compute basic earnings per share	160,916	165,579	161,908	166,142
Diluted earnings per common share	$ 0.53	$ 0.47	$ 1.49	$ 1.47
Shares used to compute diluted earnings per share	163,925	169,255	165,053	169,977
Dividends declared per common share	$ 0	$ 0	$ 0.26	$ 0.24

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 86,704	$ 79,425	$ 245,206	$ 250,276
Other comprehensive (loss) gain, net of tax:
Foreign currency translation adjustments	(3,053)	(6,037)	(5,704)	(10,290)
Unrealized (loss) gain on investments:
Unrealized (losses) gains during the period, net of income taxes of $94, $200, $(146) and $501	(160)	(734)	190	(1,254)
Less: reclassification adjustment for losses (gains) realized in net income, net of income taxes of $(52), $(62), $(143) and $(49)	102	117	266	93
Unrealized (loss) gain on investments:	(58)	(617)	456	(1,161)
Total other comprehensive loss, net of tax	(3,111)	(6,654)	(5,248)	(11,451)
Comprehensive income	$ 83,593	$ 72,771	$ 239,958	$ 238,825

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) during the period, income tax (expense) benefit	$ 94	$ 200	$ (146)	$ 501
Reclassification adjustment for (gains) losses realized in net income, income tax expense (benefit)	$ (52)	$ (62)	$ (143)	$ (49)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 245,206	$ 250,276
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1)	38,287	24,207
Net cash provided by operating activities	283,493	274,483
Cash flows from investing activities:
Additions to restricted cash	0	(518)
Additions to property and equipment	(26,656)	(35,719)
Additions to capitalized software	(33,196)	(22,508)
Purchases of marketable securities	(55,162)	(34,040)
Prepayments and maturities of marketable securities	42,625	27,008
Sales of marketable securities	1,225	7,103
Receipt of contingent payment from sale of SEI AK	2,791	2,791
Other investing activities	1,313	(1,000)
Net cash used in investing activities	(67,060)	(56,883)
Cash flows from financing activities:
Purchase and retirement of common stock	(224,815)	(213,256)
Proceeds from issuance of common stock	35,159	52,349
Tax benefit on stock options exercised	5,941	11,446
Payment of dividends	(84,686)	(80,030)
Net cash used in financing activities	(268,401)	(229,491)
Effect of exchange rate changes on cash and cash equivalents	(4,531)	(7,966)
Net decrease in cash and cash equivalents	(56,499)	(19,857)
Cash and cash equivalents, beginning of period	679,661	667,446
Cash and cash equivalents, end of period	$ 623,162	$ 647,589

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	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 September 30, 2016 , the results of operations for the three and nine months ended September 30, 2016 and 2015 , and cash flows for the nine -month periods ended September 30, 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 nine months ended September 30, 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 $347,477 and $448,957 at September 30, 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 September 30, 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 September 30, 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 $33,196 and $22,508 of software development costs during the nine months ended September 30, 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 $27,387 and $19,344 of software development costs for significant enhancements to the Platform during the nine months ended September 30, 2016 and 2015 , respectively. As of September 30, 2016 , the net book value of the Platform was $279,621 . The Platform has an estimated useful life of 15 years and a weighted average remaining life of 5.7 years . Amortization expense for the Platform was $33,387 and $31,635 during the nine months ended September 30, 2016 and 2015 , respectively. The Company also capitalized $5,809 and $3,164 of software development costs during the nine months ended September 30, 2016 and 2015 , respectively, related to a new application for the Investment Managers segment. During the three months ended September 30, 2015, the Company determined that specific functionality within the Platform is no longer in use and wrote off $5,533 of previously capitalized software development costs reported under the Private Banks and Investment Advisors business segments. The expense associated with the write-off is included in Facilities, supplies and other costs on the accompanying Consolidated Statement of Operations. Earnings per Share The calculations of basic and diluted earnings per share for the three and nine months ended September 30, 2016 and 2015 are: Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Net income $ 86,704 $ 79,425 $ 245,206 $ 250,276 Shares used to compute basic earnings per common share 160,916,000 165,579,000 161,908,000 166,142,000 Dilutive effect of stock options 3,009,000 3,676,000 3,145,000 3,835,000 Shares used to compute diluted earnings per common share 163,925,000 169,255,000 165,053,000 169,977,000 Basic earnings per common share $ 0.54 $ 0.48 $ 1.51 $ 1.51 Diluted earnings per common share $ 0.53 $ 0.47 $ 1.49 $ 1.47 During the three months ended September 30 , 2016 and 2015 , employee stock options to purchase 10,258,000 and 9,938,000 shares of common stock with an average exercise price of $34.11 and $30.02 , respectively, were outstanding but not included in the computation of diluted earnings per common share. During the nine months ended September 30, 2016 and 2015 , employee stock options to purchase 10,384,000 and 9,999,000 shares of common stock with an average exercise price of $34.07 and $30.02 , respectively, were outstanding but not included in the computation of diluted earnings per common share. These options for the three and nine month periods were not included in the computation of diluted earnings per common share because either the performance conditions have not been satisfied or would 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. Reclassifications Certain prior year amounts have been reclassified to conform to current year presentation. Statements of Cash Flows For purposes of the Consolidated Statements of Cash Flows, the Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents. The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the nine months ended September 30 : 2016 2015 Net income $ 245,206 $ 250,276 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 19,457 17,946 Amortization 33,684 31,806 Equity in earnings of unconsolidated affiliates (92,042 ) (104,917 ) Distributions received from unconsolidated affiliate 102,246 116,913 Stock-based compensation 12,044 11,476 Provision for losses on receivables 338 (196 ) Deferred income tax expense (1,521 ) (4,942 ) Gain from sale of SEI AK (2,791 ) (2,791 ) Net (gain) loss from investments (320 ) 544 Change in other long-term liabilities 2,706 1,926 Change in other assets (2,463 ) (706 ) Write-off of capitalized and purchased software — 6,055 Other 602 (2,364 ) Change in current asset and liabilities Decrease (increase) in Receivables from investment products (685 ) 2,601 Receivables (25,037 ) (23,081 ) Other current assets (4,072 ) (11,013 ) Increase (decrease) in Accounts payable 2,497 (5,950 ) Accrued liabilities (6,945 ) (11,808 ) Deferred revenue 589 2,708 Total adjustments 38,287 24,207 Net cash provided by operating activities $ 283,493 $ 274,483 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.

Investment In Unconsolidated Af

Investment In Unconsolidated Affiliates	9 Months Ended
	Sep. 30, 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 September 30, 2016 , the Company’s total investment in LSV was $39,376 . The Company receives partnership distributions from LSV on a quarterly basis. The Company received partnership distributions from LSV of $102,246 and $116,913 in the nine months ended September 30 , 2016 and 2015 , respectively. The Company’s proportionate share in the earnings of LSV was $32,565 and $33,595 during the three months ended September 30 , 2016 and 2015 , respectively. During the nine months ended September 30, 2016 and 2015 , the Company’s proportionate share in the earnings of LSV was $92,042 and $106,267 , respectively. The following table contains the condensed financial operations of LSV for the three and nine months ended September 30, 2016 and 2015 : Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Revenues $ 103,341 $ 102,754 $ 291,819 $ 326,192 Net income 83,646 85,686 235,893 270,868 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 from approximately 39.2 percent 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 variable interest entity (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 October 13, 2016 , the remaining unpaid principal balance of the term loan guaranteed by the Company was $7,914 . 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 - In

Variable Interest Entities - Investment Products	9 Months Ended
	Sep. 30, 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 $9,145 and $12,960 in fees during the three months ended September 30, 2016 and 2015 , respectively. During the nine months ended September 30, 2016 and 2015 , the Company waived $31,513 and $36,146 , respectively, in fees.

Composition of Certain Financia

Composition of Certain Financial Statement Captions	9 Months Ended
	Sep. 30, 2016
Items Included in Consolidated Statement of Financial Condition [Abstract]
Composition of Certain Financial Statement Captions	Composition of Certain Financial Statement Captions Receivables Receivables on the accompanying Consolidated Balance Sheets consist of: September 30, 2016 December 31, 2015 Trade receivables $ 54,729 $ 47,179 Fees earned, not billed 179,494 154,919 Other receivables 14,488 21,574 248,711 223,672 Less: Allowance for doubtful accounts (987 ) (649 ) $ 247,724 $ 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: September 30, 2016 December 31, 2015 Buildings $ 151,937 $ 151,604 Equipment 103,448 86,941 Land 10,030 10,003 Purchased software 128,935 122,433 Furniture and fixtures 17,230 16,143 Leasehold improvements 15,182 15,393 Construction in progress 1,175 961 427,937 403,478 Less: Accumulated depreciation (278,675 ) (259,501 ) Property and Equipment, net $ 149,262 $ 143,977 The Company recognized $19,457 and $17,946 in depreciation expense related to property and equipment for the nine months ended September 30 , 2016 and 2015 , respectively. During the three months ended September 30, 2015, the Company determined that certain purchased software related to the SEI Wealth Platform is no longer in use and wrote off $522 of the software classified as Purchased software reported under the Private Banks business segment. The expense associated with the write-off of the software is included in Facilities, supplies and other costs on the accompanying Consolidated Statement of Operations. Accrued Liabilities Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: September 30, 2016 December 31, 2015 Accrued employee compensation $ 56,832 $ 74,687 Accrued consulting, outsourcing and professional fees 24,351 21,575 Accrued sub-advisory, distribution and other asset management fees 34,739 32,674 Accrued brokerage fees 8,613 9,058 Accrued dividend payable — 42,625 Accrued income taxes 9,390 3,505 Other accrued liabilities 36,828 33,463 Total accrued liabilities $ 170,753 $ 217,587

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	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 nine months ended September 30 , 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 September 30, 2016 or December 31, 2015 . There were no transfers of financial assets between levels within the fair value hierarchy during the nine months ended September 30 , 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 September 30, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 23,576 $ 23,576 $ — Fixed-income available-for-sale securities 69,581 — 69,581 Fixed-income securities owned 21,320 — 21,320 Investment funds sponsored by LSV (1) 4,888 $ 119,365 $ 23,576 $ 90,901 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 amounts presented in the tables above are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the accompanying Consolidated Balance Sheets (See Note 6).

Marketable Securities

Marketable Securities	9 Months Ended
	Sep. 30, 2016
Marketable Securities [Abstract]
Marketable Securities	Marketable Securities Investments Available for Sale Investments available for sale classified as non-current assets consist of: At September 30, 2016 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 21,268 $ 52 $ (868 ) $ 20,452 Equities and other mutual funds 2,965 159 — 3,124 Debt securities 68,524 1,057 — 69,581 $ 92,757 $ 1,268 $ (868 ) $ 93,157 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 September 30, 2016 and December 31, 2015 were $154 (net of income tax expense of $246 ) 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 $270 and gross realized losses of $679 from available-for-sale securities during the nine months ended September 30 , 2016 . There were gross realized gains of $394 and gross realized losses of $535 from available-for-sale securities during the nine months ended September 30 , 2015 . Gains and losses from available-for-sale securities, including amounts reclassified from accumulated comprehensive income, are reflected in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations. Investments in Affiliated Funds The Company has an investment in funds sponsored by LSV. The Company records this investment on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these funds are recognized in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations. The investment primarily consists 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 $4,888 and $4,039 at September 30, 2016 and December 31, 2015 , respectively. The Company recognized gross realized gains of $468 and $849 during the three and nine months ended September 30, 2016 , respectively, from the change in fair value of the funds. During the three and nine months ended September 30, 2015 , the Company recognized gross realized losses of $581 and $579 , 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 $21,320 and $21,235 at September 30, 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 and nine months ended September 30, 2016 and 2015 .

Lines of Credit

Lines of Credit	9 Months Ended
	Sep. 30, 2016
Line of Credit Facility [Abstract]
Lines of Credit	Line of Credit On June 13, 2016 (the Closing Date), the Company entered into a new five-year $300,000 Credit Agreement (the Credit Facility) with Wells Fargo Bank, National Association (Wells Fargo) and a syndicate of other lenders. The Credit Facility became available on the Closing Date and replaced the former credit facility agreement (the 2012 Credit Facility), also with Wells Fargo, that was scheduled to expire in February 2017 . The Credit Facility is scheduled to expire in June 2021, at which time any aggregate principal amount of loans outstanding becomes payable in full. Any borrowings made under the Credit Facility will accrue interest at rates that, at the Company's option, are based on a base rate (the Base Rate) plus a premium that can range from 0.25 percent to 1.00 percent or the London InterBank Offered Rate (LIBOR) plus a premium that can range from 1.25 percent to 2.00 percent depending on the Company’s Leverage Ratio (a ratio of consolidated indebtedness to consolidated EBITDA for the four preceding fiscal quarters, all as defined in the related agreement). The Base Rate is defined as the highest of a) the Federal Funds Rate , as published by the Federal Reserve Bank of New York, plus 0.50 percent , b) the prime commercial lending rate of Wells Fargo, c) the applicable LIBOR plus 1.00 percent , or d) 0 percent . The Company also pays quarterly commitment fees based on the unused portion of the Credit Facility. The quarterly fees for the Credit Facility can range from 0.15 percent of the amount of the unused portion to 0.30 percent , depending on the Company’s Leverage Ratio. Certain wholly-owned subsidiaries of the Company have guaranteed the obligations of the Company under the agreement. The aggregate amount of the Credit Facility may be increased by an additional $100,000 under certain conditions set forth in the agreement. The 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. 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 September 30, 2016 . The Company was in compliance with all covenants of the Credit Facility and 2012 Credit Facility during the nine months ended September 30, 2016 .

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 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 a specified diluted earnings per share target is achieved, and the remaining 50 percent when a second, higher specified diluted earnings per share target is 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 and nine months ended September 30, 2016 and 2015 , respectively, as follows: Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Stock-based compensation expense $ 4,066 $ 3,867 $ 12,044 $ 11,476 Less: Deferred tax benefit (1,466 ) (1,425 ) (4,235 ) (4,084 ) Stock-based compensation expense, net of tax $ 2,600 $ 2,442 $ 7,809 $ 7,392 As of September 30, 2016 , there was approximately $45,151 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 nine months ended September 30 , 2016 was $31,793 . The total options exercisable as of September 30, 2016 had an intrinsic value of $171,673 . The total intrinsic value for options exercisable is calculated as the difference between the market value of the Company’s common stock as of September 30, 2016 and the weighted average exercise price of the shares. The market value of the Company’s common stock as of September 30, 2016 was $45.61 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of September 30, 2016 was $21.63 . Total options that were outstanding and exercisable as of September 30, 2016 were 17,416,000 and 7,158,000 , 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 5,193,000 shares at a total cost of $227,551 during the nine months ended September 30 , 2016 . The cost of stock purchases during the period includes the cost of certain transactions that settled in the following quarter. As of September 30, 2016 , the Company had approximately $85,575 of authorization remaining for the purchase of common stock under the program. The Company immediately retires its common stock when purchased. Upon retirement, the Company reduces Capital in excess of par value for the average capital per share outstanding and the remainder is charged against Retained earnings. If the Company reduces its Retained earnings to zero, any subsequent purchases of common stock will be charged entirely to Capital in excess of par value. Cash Dividend On May 25, 2016 , the Board of Directors declared a cash dividend of $0.26 per share on the Company's common stock, which was paid on June 22, 2016 , to shareholders of record on June 14, 2016 . Cash dividends declared during the nine months ended September 30, 2016 and 2015 were $42,061 and $39,852 , respectively.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 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 (loss) gain before reclassifications (5,704 ) 190 (5,514 ) Amounts reclassified from accumulated other comprehensive income — 266 266 Net current-period other comprehensive (loss) gain (5,704 ) 456 (5,248 ) Balance, September 30, 2016 $ (30,692 ) $ 154 $ (30,538 )

Business Segment Information

Business Segment Information	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Business Segment Information	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 and nine months ended September 30, 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 September 30, 2016 and 2015 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended September 30, 2016 Revenues $ 115,952 $ 85,258 $ 76,222 $ 75,672 $ 1,537 $ 354,641 Expenses 105,523 45,080 36,943 48,588 5,348 241,482 Operating profit (loss) $ 10,429 $ 40,178 $ 39,279 $ 27,084 $ (3,811 ) $ 113,159 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended September 30, 2015 Revenues $ 116,280 $ 76,238 $ 74,515 $ 67,162 $ 1,427 $ 335,622 Expenses 104,217 45,530 36,923 43,899 5,179 235,748 Operating profit (loss) $ 12,063 $ 30,708 $ 37,592 $ 23,263 $ (3,752 ) $ 99,874 A reconciliation of the total operating profit reported for the business segments to income from operations in the Consolidated Statements of Operations for the three months ended September 30 , 2016 and 2015 is as follows: 2016 2015 Total operating profit from segments $ 113,159 $ 99,874 Corporate overhead expenses (15,941 ) (12,856 ) Income from operations $ 97,218 $ 87,018 The following tables provide additional information for the three months ended September 30 , 2016 and 2015 pertaining to our business segments: Capital Expenditures (1) Depreciation 2016 2015 2016 2015 Private Banks $ 15,018 $ 12,707 $ 3,289 $ 3,141 Investment Advisors 6,744 4,899 940 864 Institutional Investors 1,744 1,955 344 302 Investment Managers 6,210 5,286 1,228 1,039 Investments in New Businesses 379 379 549 572 Total from business segments $ 30,095 $ 25,226 $ 6,350 $ 5,918 Corporate overhead 1,111 1,205 226 190 $ 31,206 $ 26,431 $ 6,576 $ 6,108 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2016 2015 Private Banks $ 7,972 $ 7,604 Investment Advisors 2,626 2,512 Institutional Investors 425 383 Investment Managers 275 255 Investments in New Businesses 40 26 Total from business segments $ 11,338 $ 10,780 Corporate overhead 50 57 $ 11,388 $ 10,837 The following tables highlight certain financial information about each of the Company’s business segments for the nine months ended September 30, 2016 and 2015 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Nine Months Ended September 30, 2016 Revenues $ 344,149 $ 243,820 $ 223,793 $ 216,528 $ 4,445 $ 1,032,735 Expenses 312,126 134,575 108,875 140,831 15,935 712,342 Operating profit (loss) $ 32,023 $ 109,245 $ 114,918 $ 75,697 $ (11,490 ) $ 320,393 Gain on sale of subsidiary 2,791 — — — — 2,791 Segment profit (loss) $ 34,814 $ 109,245 $ 114,918 $ 75,697 $ (11,490 ) $ 323,184 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Nine Months Ended September 30, 2015 Revenues $ 342,826 $ 228,006 $ 224,043 $ 199,809 $ 4,127 $ 998,811 Expenses 308,200 125,446 108,662 126,663 14,848 683,819 Operating profit (loss) $ 34,626 $ 102,560 $ 115,381 $ 73,146 $ (10,721 ) $ 314,992 Gain on sale of subsidiary 2,791 — — — — 2,791 Segment profit (loss) $ 37,417 $ 102,560 $ 115,381 $ 73,146 $ (10,721 ) $ 317,783 A reconciliation of the total operating profit reported for the business segments to income from operations in the Consolidated Statements of Operations for the nine months ended September 30, 2016 and 2015 is as follows: 2016 2015 Total operating profit from segments $ 320,393 $ 314,992 Corporate overhead expenses (42,840 ) (38,986 ) Income from operations $ 277,553 $ 276,006 The following tables provide additional information for the nine months ended September 30, 2016 and 2015 pertaining to our business segments: Capital Expenditures Depreciation 2016 2015 2016 2015 Private Banks $ 32,184 $ 31,317 $ 9,669 $ 9,214 Investment Advisors 12,863 11,060 2,880 2,527 Institutional Investors 3,236 3,970 1,017 903 Investment Managers 9,275 9,128 3,590 3,029 Investments in New Businesses 594 662 1,644 1,706 Total from business segments $ 58,152 $ 56,137 $ 18,800 $ 17,379 Corporate Overhead 1,700 2,090 657 567 $ 59,852 $ 58,227 $ 19,457 $ 17,946 Amortization 2016 2015 Private Banks $ 23,452 $ 22,300 Investment Advisors 7,764 7,371 Institutional Investors 1,249 1,133 Investment Managers 816 755 Investments in New Businesses 106 76 Total from business segments $ 33,387 $ 31,635 Corporate Overhead 297 171 $ 33,684 $ 31,806

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The gross liability for unrecognized tax benefits at September 30, 2016 and December 31, 2015 was $16,028 and $14,517 , respectively, exclusive of interest and penalties, of which $14,054 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 September 30, 2016 and December 31, 2015 , the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $1,411 and $1,391 , respectively. September 30, 2016 December 31, 2015 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 16,028 $ 14,517 Interest and penalties on unrecognized benefits 1,411 1,391 Total gross uncertain tax positions $ 17,439 $ 15,908 Amount included in Current liabilities $ 3,336 $ 4,511 Amount included in Other long-term liabilities 14,103 11,397 $ 17,439 $ 15,908 The Company’s effective tax rate was 33.8 percent and 34.1 percent for the three months ended September 30 , 2016 and 2015 , respectively. For the nine months ended September 30, 2016 and 2015 , the Company's tax rate was 34.7 percent and 35.1 percent , respectively. 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 $3,336 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

Commitments And Contingencies	9 Months Ended
	Sep. 30, 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. On May 2, 2016, the District Court certified the class as being "all persons for whom Stanford Trust Company purchased or renewed Stanford Investment Bank Limited certificates of deposit in Louisiana between January 1, 2007 and February 13, 2009". SEI has asked the Court to clarify the class definition because the one remaining claim in the action - secondary liability under the Louisiana Securities Law -requires proof that Stanford Trust Company sold or offered to sell securities. 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

Sale of SEI Asset Korea	9 Months Ended
	Sep. 30, 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 nine months ended September 30, 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.

Summary of Significant Accoun21

Summary of Significant Accounting Policies (Policy)	9 Months Ended
	Sep. 30, 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 September 30, 2016 , the results of operations for the three and nine months ended September 30, 2016 and 2015 , and cash flows for the nine -month periods ended September 30, 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 nine months ended September 30, 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).
Reclassifications	Reclassifications Certain prior year amounts have been reclassified to conform to current year presentation.
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.
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 nine months ended September 30 , 2016 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2015 .
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.
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.
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 Accoun22

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Calculation Of Basic And Diluted Earnings Per Share	The calculations of basic and diluted earnings per share for the three and nine months ended September 30, 2016 and 2015 are: Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Net income $ 86,704 $ 79,425 $ 245,206 $ 250,276 Shares used to compute basic earnings per common share 160,916,000 165,579,000 161,908,000 166,142,000 Dilutive effect of stock options 3,009,000 3,676,000 3,145,000 3,835,000 Shares used to compute diluted earnings per common share 163,925,000 169,255,000 165,053,000 169,977,000 Basic earnings per common share $ 0.54 $ 0.48 $ 1.51 $ 1.51 Diluted earnings per common share $ 0.53 $ 0.47 $ 1.49 $ 1.47
Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities	The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the nine months ended September 30 : 2016 2015 Net income $ 245,206 $ 250,276 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 19,457 17,946 Amortization 33,684 31,806 Equity in earnings of unconsolidated affiliates (92,042 ) (104,917 ) Distributions received from unconsolidated affiliate 102,246 116,913 Stock-based compensation 12,044 11,476 Provision for losses on receivables 338 (196 ) Deferred income tax expense (1,521 ) (4,942 ) Gain from sale of SEI AK (2,791 ) (2,791 ) Net (gain) loss from investments (320 ) 544 Change in other long-term liabilities 2,706 1,926 Change in other assets (2,463 ) (706 ) Write-off of capitalized and purchased software — 6,055 Other 602 (2,364 ) Change in current asset and liabilities Decrease (increase) in Receivables from investment products (685 ) 2,601 Receivables (25,037 ) (23,081 ) Other current assets (4,072 ) (11,013 ) Increase (decrease) in Accounts payable 2,497 (5,950 ) Accrued liabilities (6,945 ) (11,808 ) Deferred revenue 589 2,708 Total adjustments 38,287 24,207 Net cash provided by operating activities $ 283,493 $ 274,483

Investment In Unconsolidated 23

Investment In Unconsolidated Affiliates (Tables)	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2016 and 2015 : Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Revenues $ 103,341 $ 102,754 $ 291,819 $ 326,192 Net income 83,646 85,686 235,893 270,868

Composition of Certain Financ24

Composition of Certain Financial Statement Captions (Tables)	9 Months Ended
	Sep. 30, 2016
Items Included in Consolidated Statement of Financial Condition [Abstract]
Receivables	Receivables on the accompanying Consolidated Balance Sheets consist of: September 30, 2016 December 31, 2015 Trade receivables $ 54,729 $ 47,179 Fees earned, not billed 179,494 154,919 Other receivables 14,488 21,574 248,711 223,672 Less: Allowance for doubtful accounts (987 ) (649 ) $ 247,724 $ 223,023
Property And Equipment	Property and Equipment on the accompanying Consolidated Balance Sheets consists of: September 30, 2016 December 31, 2015 Buildings $ 151,937 $ 151,604 Equipment 103,448 86,941 Land 10,030 10,003 Purchased software 128,935 122,433 Furniture and fixtures 17,230 16,143 Leasehold improvements 15,182 15,393 Construction in progress 1,175 961 427,937 403,478 Less: Accumulated depreciation (278,675 ) (259,501 ) Property and Equipment, net $ 149,262 $ 143,977
Accrued Liabilities	Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: September 30, 2016 December 31, 2015 Accrued employee compensation $ 56,832 $ 74,687 Accrued consulting, outsourcing and professional fees 24,351 21,575 Accrued sub-advisory, distribution and other asset management fees 34,739 32,674 Accrued brokerage fees 8,613 9,058 Accrued dividend payable — 42,625 Accrued income taxes 9,390 3,505 Other accrued liabilities 36,828 33,463 Total accrued liabilities $ 170,753 $ 217,587

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 23,576 $ 23,576 $ — Fixed-income available-for-sale securities 69,581 — 69,581 Fixed-income securities owned 21,320 — 21,320 Investment funds sponsored by LSV (1) 4,888 $ 119,365 $ 23,576 $ 90,901 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 amounts presented in the tables above are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the accompanying Consolidated Balance Sheets (See Note 6).

Marketable Securities (Tables)

Marketable Securities (Tables)	9 Months Ended
	Sep. 30, 2016
Marketable Securities [Abstract]
Investments Available For Sale	Investments available for sale classified as non-current assets consist of: At September 30, 2016 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 21,268 $ 52 $ (868 ) $ 20,452 Equities and other mutual funds 2,965 159 — 3,124 Debt securities 68,524 1,057 — 69,581 $ 92,757 $ 1,268 $ (868 ) $ 93,157 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

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2016 and 2015 , respectively, as follows: Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Stock-based compensation expense $ 4,066 $ 3,867 $ 12,044 $ 11,476 Less: Deferred tax benefit (1,466 ) (1,425 ) (4,235 ) (4,084 ) Stock-based compensation expense, net of tax $ 2,600 $ 2,442 $ 7,809 $ 7,392

Accumulated Other Comprehensi28

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 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 (loss) gain before reclassifications (5,704 ) 190 (5,514 ) Amounts reclassified from accumulated other comprehensive income — 266 266 Net current-period other comprehensive (loss) gain (5,704 ) 456 (5,248 ) Balance, September 30, 2016 $ (30,692 ) $ 154 $ (30,538 )

Business Segment Information (T

Business Segment Information (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2016 and 2015 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended September 30, 2016 Revenues $ 115,952 $ 85,258 $ 76,222 $ 75,672 $ 1,537 $ 354,641 Expenses 105,523 45,080 36,943 48,588 5,348 241,482 Operating profit (loss) $ 10,429 $ 40,178 $ 39,279 $ 27,084 $ (3,811 ) $ 113,159 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended September 30, 2015 Revenues $ 116,280 $ 76,238 $ 74,515 $ 67,162 $ 1,427 $ 335,622 Expenses 104,217 45,530 36,923 43,899 5,179 235,748 Operating profit (loss) $ 12,063 $ 30,708 $ 37,592 $ 23,263 $ (3,752 ) $ 99,874 The following tables highlight certain financial information about each of the Company’s business segments for the nine months ended September 30, 2016 and 2015 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Nine Months Ended September 30, 2016 Revenues $ 344,149 $ 243,820 $ 223,793 $ 216,528 $ 4,445 $ 1,032,735 Expenses 312,126 134,575 108,875 140,831 15,935 712,342 Operating profit (loss) $ 32,023 $ 109,245 $ 114,918 $ 75,697 $ (11,490 ) $ 320,393 Gain on sale of subsidiary 2,791 — — — — 2,791 Segment profit (loss) $ 34,814 $ 109,245 $ 114,918 $ 75,697 $ (11,490 ) $ 323,184 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Nine Months Ended September 30, 2015 Revenues $ 342,826 $ 228,006 $ 224,043 $ 199,809 $ 4,127 $ 998,811 Expenses 308,200 125,446 108,662 126,663 14,848 683,819 Operating profit (loss) $ 34,626 $ 102,560 $ 115,381 $ 73,146 $ (10,721 ) $ 314,992 Gain on sale of subsidiary 2,791 — — — — 2,791 Segment profit (loss) $ 37,417 $ 102,560 $ 115,381 $ 73,146 $ (10,721 ) $ 317,783
Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations	A reconciliation of the total operating profit reported for the business segments to income from operations in the Consolidated Statements of Operations for the three months ended September 30 , 2016 and 2015 is as follows: 2016 2015 Total operating profit from segments $ 113,159 $ 99,874 Corporate overhead expenses (15,941 ) (12,856 ) Income from operations $ 97,218 $ 87,018 A reconciliation of the total operating profit reported for the business segments to income from operations in the Consolidated Statements of Operations for the nine months ended September 30, 2016 and 2015 is as follows: 2016 2015 Total operating profit from segments $ 320,393 $ 314,992 Corporate overhead expenses (42,840 ) (38,986 ) Income from operations $ 277,553 $ 276,006
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table Text Block]	The following tables provide additional information for the three months ended September 30 , 2016 and 2015 pertaining to our business segments: Capital Expenditures (1) Depreciation 2016 2015 2016 2015 Private Banks $ 15,018 $ 12,707 $ 3,289 $ 3,141 Investment Advisors 6,744 4,899 940 864 Institutional Investors 1,744 1,955 344 302 Investment Managers 6,210 5,286 1,228 1,039 Investments in New Businesses 379 379 549 572 Total from business segments $ 30,095 $ 25,226 $ 6,350 $ 5,918 Corporate overhead 1,111 1,205 226 190 $ 31,206 $ 26,431 $ 6,576 $ 6,108 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2016 2015 Private Banks $ 7,972 $ 7,604 Investment Advisors 2,626 2,512 Institutional Investors 425 383 Investment Managers 275 255 Investments in New Businesses 40 26 Total from business segments $ 11,338 $ 10,780 Corporate overhead 50 57 $ 11,388 $ 10,837 The following tables provide additional information for the nine months ended September 30, 2016 and 2015 pertaining to our business segments: Capital Expenditures Depreciation 2016 2015 2016 2015 Private Banks $ 32,184 $ 31,317 $ 9,669 $ 9,214 Investment Advisors 12,863 11,060 2,880 2,527 Institutional Investors 3,236 3,970 1,017 903 Investment Managers 9,275 9,128 3,590 3,029 Investments in New Businesses 594 662 1,644 1,706 Total from business segments $ 58,152 $ 56,137 $ 18,800 $ 17,379 Corporate Overhead 1,700 2,090 657 567 $ 59,852 $ 58,227 $ 19,457 $ 17,946 Amortization 2016 2015 Private Banks $ 23,452 $ 22,300 Investment Advisors 7,764 7,371 Institutional Investors 1,249 1,133 Investment Managers 816 755 Investments in New Businesses 106 76 Total from business segments $ 33,387 $ 31,635 Corporate Overhead 297 171 $ 33,684 $ 31,806

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Schedule Of Interest And Penalties	September 30, 2016 December 31, 2015 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 16,028 $ 14,517 Interest and penalties on unrecognized benefits 1,411 1,391 Total gross uncertain tax positions $ 17,439 $ 15,908 Amount included in Current liabilities $ 3,336 $ 4,511 Amount included in Other long-term liabilities 14,103 11,397 $ 17,439 $ 15,908

Summary of Significant Accoun31

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Cash and cash equivalents invested in SEI-sponsored money market funds	$ 623,162	$ 647,589	$ 623,162	$ 647,589	$ 679,661	$ 667,446
Restricted cash	5,500		5,500		5,500
Capitalized software development costs			33,196	$ 22,508
Net book value of SEI Wealth Platform	$ 290,329		$ 290,329		290,522
Anti-dilutive employee stock options	10,258	9,938	10,384	9,999
Antidilutive securities excluded from computation of net income, per outstanding unit, amount	$ 34.11	$ 30.02	$ 34.07	$ 30.02
SEI Investments Distribution Co. (SIDCO) [Member]
Restricted cash	$ 500		$ 500		500
SEI Investments (Europe) Limited [Member]
Restricted cash	5,000		5,000		5,000
SEI-Sponsored Open-Ended Money Market Mutual Funds [Member]
Cash and cash equivalents invested in SEI-sponsored money market funds	347,477		347,477		$ 448,957
SEI Wealth Platform [Member]
Capitalized software development costs			27,387	$ 19,344
Net book value of SEI Wealth Platform	$ 279,621		279,621
Estimated useful life of the SEI Wealth Platform	15 years
Amortization expense related to the SEI Wealth Platform			33,387	31,635
Income statement classification for capitalized software write-off related to the SEI Wealth Platform		Facilities, supplies and other costs
New application for Investment Managers segment [Member]
Capitalized software development costs			$ 5,809	$ 3,164
Weighted Average [Member] | SEI Wealth Platform [Member]
Estimated useful life of the SEI Wealth Platform	5 years 8 months 27 days
Private Banks [Member] | SEI Wealth Platform [Member]
Segment classification for capitalized software write-off		Private Banks
Investment Advisors [Member] | SEI Wealth Platform [Member]
Segment classification for capitalized software write-off		Investment Advisors
Capitalized software [Member] | SEI Wealth Platform [Member]
Loss on write-off of capitalized software related to the SEI Wealth Platform		$ 5,533

Summary of Significant Accoun32

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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accounting Policies [Abstract]
Net income	$ 86,704	$ 79,425	$ 245,206	$ 250,276
Shares used to compute basic earnings per common share	160,916	165,579	161,908	166,142
Dilutive effect of stock options	3,009	3,676	3,145	3,835
Shares used to compute diluted earnings per common share	163,925	169,255	165,053	169,977
Basic earnings per common share	$ 0.54	$ 0.48	$ 1.51	$ 1.51
Diluted earnings per common share	$ 0.53	$ 0.47	$ 1.49	$ 1.47

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accounting Policies [Abstract]
Net income	$ 86,704	$ 79,425	$ 245,206	$ 250,276
Depreciation	6,576	6,108	19,457	17,946
Amortization	11,388	10,837	33,684	31,806
Equity in earnings of unconsolidated affiliates	(32,565)	(33,595)	(92,042)	(104,917)
Distributions received from unconsolidated affiliate			102,246	116,913
Stock-based compensation	4,066	3,867	12,044	11,476
Provision for losses on receivables			338	(196)
Deferred income tax expense			(1,521)	(4,942)
Gain on sale of SEI AK	$ 0	$ 0	(2,791)	(2,791)
Net (gain) loss from investments			(320)	544
Change in other long-term liabilities			2,706	1,926
Change in other assets			(2,463)	(706)
Write-off of capitalized and purchased software			0	6,055
Other			602	(2,364)
Decrease (increase) in Receivables from investment products			(685)	2,601
Decrease (increase) in Receivables			(25,037)	(23,081)
Decrease (increase) in Other current assets			(4,072)	(11,013)
Increase (decrease) in Accounts payable			2,497	(5,950)
Increase (decrease) in Accrued liabilities			(6,945)	(11,808)
Increase (decrease) in Deferred revenue			589	2,708
Total adjustments			38,287	24,207
Net cash provided by operating activities			$ 283,493	$ 274,483

Investment In Unconsolidated 34

Investment In Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Oct. 13, 2016	Apr. 30, 2016	Mar. 31, 2016	Oct. 31, 2012
Investments in and Advances to Affiliates [Line Items]
Distributions received from unconsolidated affiliate			$ 102,246	$ 116,913
Company's share in the earnings of equity method investee	$ 32,565	$ 33,595	92,042	104,917
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					$ 7,914
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						38.90%	39.20%
Total investment in equity method investee	39,376		39,376
Distributions received from unconsolidated affiliate			102,246	116,913
Company's share in the earnings of equity method investee	$ 32,565	$ 33,595	$ 92,042	$ 106,267
Maximum [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%

Investment In Unconsolidated 35

Investment In Unconsolidated Affiliates (Condensed Statement Of Operations Of LSV) (Details) - L S V Asset Management [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]
Revenue of LSV Asset Management	$ 103,341	$ 102,754	$ 291,819	$ 326,192
Net income of LSV Asset Management	$ 83,646	$ 85,686	$ 235,893	$ 270,868

Variable Interest Entities - 36

Variable Interest Entities - Investment Products (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
SEI-Sponsored Open-Ended Money Market Mutual Funds [Member]
Financial Support for Nonconsolidated Legal Entity [Line Items]
Fees waived according to expense limitation agreements	$ 9,145	$ 12,960	$ 31,513	$ 36,146

Composition of Certain Financ37

Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Items Included in Consolidated Statement of Financial Condition [Abstract]
Trade receivables	$ 54,729	$ 47,179
Fees earned, not billed	179,494	154,919
Other receivables	14,488	21,574
Receivables, Gross, Current	248,711	223,672
Less: Allowance for doubtful accounts	(987)	(649)
Receivables, net	$ 247,724	$ 223,023

Composition of Certain Financ38

Composition of Certain Financial Statement Captions (Property And Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 427,937		$ 427,937		$ 403,478
Less: Accumulated depreciation	(278,675)		(278,675)		(259,501)
Property and Equipment, net	149,262		149,262		143,977
Depreciation expense	6,576	$ 6,108	19,457	$ 17,946
Loss on write-off of purchased software related to the SEI Wealth Platform			0	$ (6,055)
Building [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	151,937		151,937		151,604
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	103,448		103,448		86,941
Land [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	10,030		10,030		10,003
Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	128,935		128,935		122,433
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	17,230		17,230		16,143
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	15,182		15,182		15,393
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 1,175		$ 1,175		$ 961
SEI Wealth Platform [Member]
Property, Plant and Equipment [Line Items]
Income statement classification for capitalized software write-off related to the SEI Wealth Platform		Facilities, supplies and other costs
Private Banks [Member] | SEI Wealth Platform [Member]
Property, Plant and Equipment [Line Items]
Segment classification for capitalized software write-off		Private Banks
Property, Plant and Equipment [Member] | SEI Wealth Platform [Member]
Property, Plant and Equipment [Line Items]
Loss on write-off of purchased software related to the SEI Wealth Platform		$ 522

Composition of Certain Financ39

Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 56,832	$ 74,687
Accrued consulting, outsourcing and professional fees	24,351	21,575
Accrued sub-advisory, distribution and other asset management fees	34,739	32,674
Accrued brokerage fees	8,613	9,058
Accrued dividend payable	0	42,625
Accrued income taxes	9,390	3,505
Other accrued liabilities	36,828	33,463
Total accrued liabilities	$ 170,753	$ 217,587

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Of Certain Financial Assets And Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	$ 23,576	$ 10,657
Fixed income available-for-sale securities	69,581	70,637
Fixed income securities owned	21,320	21,235
Investment funds sponsored by LSV	4,888	4,039
Assets, fair value	119,365	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	23,576	10,657
Fixed income available-for-sale securities	0	0
Fixed income securities owned	0	0
Assets, fair value	23,576	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	69,581	70,637
Fixed income securities owned	21,320	21,235
Assets, fair value	$ 90,901	$ 91,872

Marketable Securities (Narrativ

Marketable Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule of Investments [Line Items]
Net unrealized gains (losses)	$ 154		$ 154		$ (302)
Unrealized gains (losses) during the period, income tax expense (benefit)	246		246		(43)
Available-for-sale securities, gross realized gains			270	$ 394
Available-for-sale securities, gross realized losses			679	535
Investment funds sponsored by LSV	4,888		4,888		4,039
Securities owned	21,320		21,320		21,235
Private Equity Funds, Foreign [Member]
Schedule of Investments [Line Items]
Investment funds sponsored by LSV	4,888		4,888		$ 4,039
Realized gains (losses) from investment funds sponsored by LSV	$ 468	$ (581)	$ 849	$ (579)

Marketable Securities (Investme

Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	$ 92,757	$ 81,639
Available-for-sale securities, accumulated gross unrealized gain, before tax	1,268	397
Available-for-sale securities, accumulated gross unrealized loss, before tax	(868)	(742)
Available-for-sale securities, fair value	93,157	81,294
SEI-Sponsored Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	21,268	8,474
Available-for-sale securities, accumulated gross unrealized gain, before tax	52	0
Available-for-sale securities, accumulated gross unrealized loss, before tax	(868)	(742)
Available-for-sale securities, fair value	20,452	7,732
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	2,965	2,857
Available-for-sale securities, accumulated gross unrealized gain, before tax	159	68
Available-for-sale securities, accumulated gross unrealized loss, before tax	0	0
Available-for-sale securities, fair value	3,124	2,925
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	68,524	70,308
Available-for-sale securities, accumulated gross unrealized gain, before tax	1,057	329
Available-for-sale securities, accumulated gross unrealized loss, before tax	0	0
Available-for-sale securities, fair value	$ 69,581	$ 70,637

Lines of Credit (Details)

Lines of Credit (Details) - Line of Credit [Member] - USD ($)	Jun. 13, 2016	Sep. 30, 2016
Line of Credit Facility [Line Items]
Credit facility term	5 years
Credit facility maximum borrowing capacity	$ 300,000,000
Credit facility expiration date	Jun. 12, 2021
Credit facility stated percentage	0.00%
Credit facility accordion feature, increase limit	$ 100,000,000
Borrowings outstanding		$ 0
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread (as a percent)	1.00%
Credit facility description of variable rate basis	London InterBank Offered Rate
Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread (as a percent)	0.50%
Credit facility description of variable rate basis	Federal Funds Rate
Minimum [Member]
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion (as a percent)	0.15%
Minimum [Member] | Lender's Base Rate Plus Market Spread [Member]
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread (as a percent)	0.25%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread (as a percent)	1.25%
Maximum [Member]
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion (as a percent)	0.30%
Maximum [Member] | Lender's Base Rate Plus Market Spread [Member]
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread (as a percent)	1.00%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread (as a percent)	2.00%

Shareholders' Equity (Narrative

Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Jun. 22, 2016	May 25, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost			$ 45,151		$ 45,151
Total intrinsic value of options exercised					31,793
Aggregate intrinsic value of options exercisable			$ 171,673		$ 171,673
Market value of Company's common stock			$ 45.61		$ 45.61
Weighted average exercise price per share			$ 21.63		$ 21.63
Total options outstanding			17,416		17,416
Total options exercisable			7,158		7,158
Dividends declared per common share		$ 0.26	$ 0	$ 0	$ 0.26	$ 0.24
Cash dividends paid per common share	$ 0.26
Cash dividends declared on the Company's common stock					$ 42,061	$ 39,852
Common Stock Buyback [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased and retired					5,193
Company purchased, cost					$ 227,551
Remaining stock repurchase authorization amount			$ 85,575		$ 85,575
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%

Shareholders' Equity (Stock-Bas

Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 4,066	$ 3,867	$ 12,044	$ 11,476
Less: Deferred tax benefit	(1,466)	(1,425)	(4,235)	(4,084)
Stock-based compensation expense, net of tax	$ 2,600	$ 2,442	$ 7,809	$ 7,392

Accumulated Other Comprehensi46

Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)
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 (loss) gain before reclassifications	(5,514)
Amounts reclassified from accumulated other comprehensive income	266
Net current-period other comprehensive (loss) gain	(5,248)
Ending balance	(30,538)
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 (loss) gain before reclassifications	(5,704)
Amounts reclassified from accumulated other comprehensive income	0
Net current-period other comprehensive (loss) gain	(5,704)
Ending balance	(30,692)
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 (loss) gain before reclassifications	190
Amounts reclassified from accumulated other comprehensive income	266
Net current-period other comprehensive (loss) gain	456
Ending balance	$ 154

Business Segment Information (S

Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenues	$ 354,641	$ 335,622	$ 1,032,735	$ 998,811
Expenses	241,482	235,748	712,342	683,819
Operating profit (loss)	113,159	99,874	320,393	314,992
Gain on sale of subsidiary	0	0	2,791	2,791
Segment profit (loss)			323,184	317,783
Private Banks [Member]
Segment Reporting Information [Line Items]
Revenues	115,952	116,280	344,149	342,826
Expenses	105,523	104,217	312,126	308,200
Operating profit (loss)	10,429	12,063	32,023	34,626
Gain on sale of subsidiary	0	0	2,791	2,791
Segment profit (loss)			34,814	37,417
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Revenues	85,258	76,238	243,820	228,006
Expenses	45,080	45,530	134,575	125,446
Operating profit (loss)	40,178	30,708	109,245	102,560
Gain on sale of subsidiary	0	0	0	0
Segment profit (loss)			109,245	102,560
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Revenues	76,222	74,515	223,793	224,043
Expenses	36,943	36,923	108,875	108,662
Operating profit (loss)	39,279	37,592	114,918	115,381
Gain on sale of subsidiary	0	0	0	0
Segment profit (loss)			114,918	115,381
Investment Managers [Member]
Segment Reporting Information [Line Items]
Revenues	75,672	67,162	216,528	199,809
Expenses	48,588	43,899	140,831	126,663
Operating profit (loss)	27,084	23,263	75,697	73,146
Gain on sale of subsidiary	0	0	0	0
Segment profit (loss)			75,697	73,146
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Revenues	1,537	1,427	4,445	4,127
Expenses	5,348	5,179	15,935	14,848
Operating profit (loss)	(3,811)	(3,752)	(11,490)	(10,721)
Gain on sale of subsidiary	$ 0	$ 0	0	0
Segment profit (loss)			$ (11,490)	$ (10,721)

Business Segment Information (R

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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Total operating profit from segments above	$ 113,159	$ 99,874	$ 320,393	$ 314,992
Income from operations	97,218	87,018	277,553	276,006
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total operating profit from segments above	113,159	99,874	320,393	314,992
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Corporate overhead expenses	$ (15,941)	$ (12,856)	$ (42,840)	$ (38,986)

Business Segment Information 49

Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Capital Expenditures	$ 31,206	$ 26,431	$ 59,852	$ 58,227
Depreciation	6,576	6,108	19,457	17,946
Amortization	11,388	10,837	33,684	31,806
Private Banks [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	15,018	12,707	32,184	31,317
Depreciation	3,289	3,141	9,669	9,214
Amortization	7,972	7,604	23,452	22,300
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	6,744	4,899	12,863	11,060
Depreciation	940	864	2,880	2,527
Amortization	2,626	2,512	7,764	7,371
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	1,744	1,955	3,236	3,970
Depreciation	344	302	1,017	903
Amortization	425	383	1,249	1,133
Investment Managers [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	6,210	5,286	9,275	9,128
Depreciation	1,228	1,039	3,590	3,029
Amortization	275	255	816	755
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	379	379	594	662
Depreciation	549	572	1,644	1,706
Amortization	40	26	106	76
Total From Business Segments [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	30,095	25,226	58,152	56,137
Depreciation	6,350	5,918	18,800	17,379
Amortization	11,338	10,780	33,387	31,635
Corporate Overhead [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	1,111	1,205	1,700	2,090
Depreciation	226	190	657	567
Amortization	$ 50	$ 57	$ 297	$ 171

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 16,028		$ 16,028		$ 14,517
Unrecognized tax benefits that would affect effective tax rate	14,054		14,054		12,898
Interest and penalties on unrecognized benefits	$ 1,411		$ 1,411		$ 1,391
Effective tax rates	33.80%	34.10%	34.70%	35.10%
Settlement and Lapse of Statute [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits within the next twelve months	$ 3,336		$ 3,336

Income Taxes (Interest And Pena

Income Taxes (Interest And Penalties) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 16,028	$ 14,517
Interest and penalties on unrecognized benefits	1,411	1,391
Gross uncertain tax positions	17,439	15,908
Amount included in Current liabilities	3,336	4,511
Amount included in Other long-term liabilities	$ 14,103	$ 11,397

Sale of SEI Asset Korea (Narrat

Sale of SEI Asset Korea (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Mar. 28, 2013	Sep. 30, 2016	Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of subsidiary	$ 0	$ 0		$ 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