SEI Investments (SEIC) 10-Q 27 Jul 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 20, 2017
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	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Trading Symbol	SEIC
Amendment Flag	false
Entity Common Stock, Shares Outstanding		158,107,559

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 660,362	$ 695,701
Restricted cash	3,502	3,500
Receivables from investment products	49,048	61,761
Receivables, net of allowance for doubtful accounts of $680 and $523	262,544	227,957
Securities owned	21,412	21,339
Other current assets	31,953	27,575
Total Current Assets	1,028,821	1,037,833
Property and Equipment, net of accumulated depreciation of $298,294 and $285,322	145,537	146,190
Capitalized Software, net of accumulated amortization of $328,026 and $303,540	304,673	295,867
Investments Available for Sale	86,085	84,033
Investments in Affiliated Funds, at fair value	5,350	4,858
Investment in Unconsolidated Affiliate	45,197	50,459
Deferred Income Taxes	1,773	2,127
Other Assets, net	16,653	15,456
Total Assets	1,634,089	1,636,823
Current Liabilities:
Accounts payable	5,407	5,966
Accrued liabilities	170,577	240,525
Deferred revenue	2,809	2,880
Total Current Liabilities	178,793	249,371
Deferred Tax Liabilities, Net	69,419	69,693
Other Long-term Liabilities	14,142	14,645
Total Liabilities	262,354	333,709
Commitments and Contingencies
SEI Investments shareholders' equity:
Common stock, $.01 par value, 750,000 shares authorized; 157,986 and 159,031 shares issued and outstanding	1,580	1,590
Capital in excess of par value	988,761	955,461
Retained earnings	409,409	384,018
Accumulated other comprehensive loss, net	(28,015)	(37,955)
Total Shareholders' Equity	1,371,735	1,303,114
Total Liabilities and Shareholders' Equity	$ 1,634,089	$ 1,636,823

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current Assets:
Receivables, allowance for doubtful accounts	$ 680	$ 523
Property and Equipment, accumulated depreciation	298,294	285,322
Capitalized Software, accumulated amortization	$ 328,026	$ 303,540
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	157,986,000	159,031,000
Common stock, shares outstanding	157,986,000	159,031,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Asset management, administration and distribution fees	$ 288,490	$ 262,275	$ 567,055	$ 513,712
Information processing and software servicing fees	77,816	74,992	152,579	148,391
Transaction-based and trade execution fees	6,025	6,564	12,681	15,991
Total revenues	372,331	343,831	732,315	678,094
Expenses:
Subadvisory, distribution and other asset management costs	43,288	40,870	85,790	80,065
Software royalties and other information processing costs	7,712	7,677	15,374	15,425
Brokerage commissions	4,226	5,093	9,185	12,201
Compensation, benefits and other personnel	109,555	102,282	218,498	204,213
Stock-based compensation	6,259	4,189	12,439	7,978
Consulting, outsourcing and professional fees	48,335	39,575	91,484	78,081
Data processing and computer related	17,883	15,782	34,655	31,500
Facilities, supplies and other costs	18,682	17,122	36,160	33,119
Amortization	12,565	11,284	24,587	22,296
Depreciation	6,599	6,434	13,399	12,881
Total expenses	275,104	250,308	541,571	497,759
Income from operations	97,227	93,523	190,744	180,335
Net gain from investments	44	250	391	124
Interest and dividend income	1,686	1,033	3,029	2,116
Interest expense	(114)	(187)	(226)	(301)
Equity in earnings of unconsolidated affiliate	36,315	30,285	69,880	59,477
Gain on sale of subsidiary	0	0	0	2,791
Income before income taxes	135,158	124,904	263,818	244,542
Income taxes	43,389	43,899	83,312	86,040
Net income	$ 91,769	$ 81,005	$ 180,506	$ 158,502
Basic earnings per common share	$ 0.58	$ 0.50	$ 1.14	$ 0.98
Shares used to compute basic earnings per share	158,325	161,795	158,708	162,404
Diluted earnings per common share	$ 0.57	$ 0.49	$ 1.11	$ 0.96
Shares used to compute diluted earnings per share	161,709	165,088	162,226	165,616
Dividends declared per common share	$ 0.28	$ 0.26	$ 0.28	$ 0.26

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 91,769	$ 81,005	$ 180,506	$ 158,502
Other comprehensive gain (loss), net of tax:
Foreign currency translation adjustments	7,222	(5,080)	9,710	(2,651)
Unrealized gain (loss) on investments:
Unrealized gains during the period, net of income taxes of $(51), $(49), $(32) and $(240)	165	20	141	350
Less: reclassification adjustment for losses (gains) realized in net income, net of income taxes of $(53), $12, $(43) and $(91)	111	(23)	89	164
Unrealized gain (loss) on investments:	276	(3)	230	514
Total other comprehensive gain (loss), net of tax	7,498	(5,083)	9,940	(2,137)
Comprehensive income	$ 99,267	$ 75,922	$ 190,446	$ 156,365

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Unrealized (losses) gains during the period, income tax benefit (expense)	$ (51)	$ (49)	$ (32)	$ (240)
Reclassification adjustment for (gains) losses realized in net income, income tax expense (benefit)	$ (53)	$ 12	$ (43)	$ (91)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 180,506	$ 158,502
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1)	4,349	4,952
Net cash provided by operating activities	184,855	163,454
Cash flows from investing activities:
Additions to property and equipment	(10,247)	(9,049)
Additions to capitalized software	(33,292)	(19,597)
Purchases of marketable securities	(28,703)	(32,648)
Prepayments and maturities of marketable securities	26,811	26,148
Sales of marketable securities	0	185
Receipt of contingent payment from sale of SEI AK	0	2,791
Other investing activities	(1,450)	200
Net cash used in investing activities	(46,881)	(31,970)
Cash flows from financing activities:
Purchase and retirement of common stock	(122,066)	(155,730)
Proceeds from issuance of common stock	29,127	26,336
Payment of dividends	(88,862)	(84,626)
Net cash used in financing activities	(181,801)	(214,020)
Effect of exchange rate changes on cash and cash equivalents	8,488	(2,358)
Net decrease in cash and cash equivalents	(35,339)	(84,894)
Cash and cash equivalents, beginning of period	695,701	679,661
Cash and cash equivalents, end of period	$ 660,362	$ 594,767

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017 , the results of operations for the three and six months ended June 30, 2017 and 2016 , and cash flows for the six -month periods ended June 30, 2017 and 2016 . 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, 2016 . There have been no significant changes in significant accounting policies during the six months ended June 30, 2017 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 with the exception of the adoption of Accounting Standards Update (ASU) 2016-09, Improvements to Employee Share-Based Payment Accounting (ASU 2016-09). As required by ASU 2016-09, excess tax benefits recognized on stock-based compensation expense are reflected in the accompanying Consolidated Statements of Operations as a component of the provision for income taxes on a prospective basis (See Note 11). Additionally, excess tax benefits or deficiencies recognized on stock-based compensation expense are classified as an operating activity in the accompanying Consolidated Statements of Cash Flows. The Company has applied this provision retrospectively for the periods prior to the date of adoption. As a result, for the six months ended June 30, 2016 , net cash provided by operating activities increased by $4,004 with a corresponding offset to net cash used for financing activities. ASU 2016-09 also allows for the option to account for forfeitures as they occur when determining the amount of compensation cost to be recognized, rather than estimating expected forfeitures over the course of a vesting period. The Company elected to account for forfeitures as they occur. In addition, ASU 2016-09 eliminates anticipated windfalls and shortfalls that were included in the calculation of assumed proceeds for computing the dilutive effect of share-based payment awards in the calculation of diluted earnings per share. No adjustments to the Company's prior period reported diluted earnings per share amounts were permitted by ASU 2016-09. The net cumulative effect to the Company from the adoption of ASU 2016-09 was an increase to paid-in capital of $2,582 , a reduction to retained earnings of $1,669 and an increase to deferred tax assets of $913 as of January 1, 2017. Cash and Cash Equivalents Cash and cash equivalents includes $230,721 and $374,760 at June 30, 2017 and December 31, 2016 , 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 $3,000 at June 30, 2017 and December 31, 2016 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $502 and $500 at June 30, 2017 and December 31, 2016 , respectively, segregated in special reserve accounts for the benefit of customers of the Company’s broker-dealer subsidiary, SEI Investments Distribution Co. (SIDCO), in accordance with certain rules established by the Securities and Exchange Commission (SEC) for broker-dealers. Capitalized Software The Company capitalized $33,292 and $19,597 of software development costs during the six months ended June 30, 2017 and 2016 , respectively. The Company's software development costs primarily relate to the continued development of the SEI Wealth Platform SM (the Platform). The Company capitalized $27,994 and $16,120 of software development costs for significant enhancements to the Platform during the six months ended June 30, 2017 and 2016 , respectively. As of June 30, 2017 , the net book value of the Platform was $283,867 . The Platform has an estimated useful life of 15 years and a weighted average remaining life of 5.0 years . Amortization expense for the Platform was $24,486 and $22,049 during the six months ended June 30, 2017 and 2016 , respectively. The Company also capitalized $5,298 and $3,477 of software development costs during the six months ended June 30, 2017 and 2016 , respectively, related to an application for the Investment Managers segment. Capitalized software development costs in-progress at June 30, 2017 associated with the application were $20,806 . The application is not yet ready for use. Earnings per Share The calculations of basic and diluted earnings per share for the three and six months ended June 30, 2017 and 2016 are: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Net income $ 91,769 $ 81,005 $ 180,506 $ 158,502 Shares used to compute basic earnings per common share 158,325,000 161,795,000 158,708,000 162,404,000 Dilutive effect of stock options 3,384,000 3,293,000 3,518,000 3,212,000 Shares used to compute diluted earnings per common share 161,709,000 165,088,000 162,226,000 165,616,000 Basic earnings per common share $ 0.58 $ 0.50 $ 1.14 $ 0.98 Diluted earnings per common share $ 0.57 $ 0.49 $ 1.11 $ 0.96 During the three months ended June 30 , 2017 and 2016 , employee stock options to purchase 11,255,000 and 10,388,000 shares of common stock with an average exercise price of $37.68 and $34.06 , respectively, were outstanding but not included in the computation of diluted earnings per common share. During the six months ended June 30 , 2017 and 2016 , employee stock options to purchase 11,267,000 and 10,447,000 shares of common stock with an average exercise price of $37.69 and $34.05 , respectively, were outstanding but not included in the computation of diluted earnings per common share. These options for the three and six 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 six months ended June 30 : 2017 2016 Net income $ 180,506 $ 158,502 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 13,399 12,881 Amortization 24,587 22,296 Equity in earnings of unconsolidated affiliate (69,880 ) (59,477 ) Distributions received from unconsolidated affiliate 75,142 67,061 Stock-based compensation 12,439 7,978 Provision for losses on receivables 157 297 Deferred income tax expense 918 (311 ) Gain from sale of SEI AK — (2,791 ) Net gain from investments (391 ) (124 ) Tax benefit on stock options exercised (1) — 4,004 Change in other long-term liabilities (503 ) 865 Change in other assets 122 1,084 Other 492 1,030 Change in current assets and liabilities Decrease (increase) in Receivables from investment products 12,713 1,032 Receivables (34,744 ) (19,357 ) Other current assets (4,378 ) (4,006 ) Increase (decrease) in Accounts payable (2,329 ) (970 ) Accrued liabilities (23,324 ) (27,634 ) Deferred revenue (71 ) 1,094 Total adjustments 4,349 4,952 Net cash provided by operating activities $ 184,855 $ 163,454 (1) The tax benefit on stock options exercised for the six months ended June 30, 2016 was reclassified to operating activities from financing activities upon the adoption of ASU 2016-09. New Accounting Pronouncements In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) (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. The FASB has issued several amendments to the standard, including principal versus agent guidance and identifying performance obligations. ASU 2014-09 will become effective for the Company during the first quarter 2018. The Company continues to assess the impact of ASU 2014-09 on its revenue arrangements. The Company expects the adoption of ASU 2014-09 to have an impact to its business processes, financial reporting disclosures and internal controls over financial reporting (ICFR). As part of its project plan’s preliminary assessment and design implementation phases for the adoption of ASU 2014-09, the Company has adopted implementation controls that allows it to properly and timely adopt ASU 2014-09 on the effective date. The Company will make continuous updates to the quarterly and year-end disclosures, with a focus on both status and internal controls over financial reporting. The new standard will have a significant impact to the Company's financial statement disclosures, including identifying information that the Company will have to develop under the new standard. The Company’s implementation plan includes the following: • Developed a phased implementation project plan with a specific timeline and milestones; • Developed an understanding of the new standard and its requirements; • Analyzed the Company’s revenue streams; • Gathering and evaluating the required and relevant information for ASU 2014-09; and • Continue to monitor the impact of ASU 2014-09 and the various interpretations and supplemental guidance that become available. Upon its initial assessment, the Company has made the following observations: Revenue: • The Company offers many services which are bundled together, and provided and completed for the client on a monthly basis. In assessing these contracts, the Company expects to continue to recognize revenue for these types of services on a monthly basis as the client consumes the benefits continuously over time. Similarly, the Company expects that transaction-based and trade execution fees based on current period activity will not be affected by the adoption of ASU 2014-09. • The Company continues to assess the effect of the adoption of the new standard on the timing of the recognition of implementation fees, which are recognized in Information processing and software servicing fees as well as fund conversion fees and other ancillary fees recognized in Asset management, administration and distribution fees. While the Company has not made a final determination, the timing of the recognition for these revenues may change. • The new standard also modified some of the principal and agent considerations which may result in changes to gross or net treatment of revenue and expenses but would not affect final net income. Contract costs: • The Company is in the process of evaluating the costs of obtaining these contracts, especially for the information processing and software servicing fees revenue stream, which are affected by the standard. Sales commissions and contract costs related to fund conversions are also being evaluated. Under current guidance, contract costs are expensed at inception of an agreement but under the new standard, the costs will generally be capitalized and amortized over the period of customer life as defined in the new standard, unless a practical expedient is applied to fully expense contract costs for contracts with an amortization period of one year or less. Transition method: • The new standard provides companies with alternative methods of adoption. The Company is in the process of determining the method of adoption, which depends in part upon the completion of the evaluation of the remaining revenue arrangements. The Company expects to select the transition method by the third quarter of 2017. Upon completion of the Company’s implementation plan and evaluation of the remaining revenue contracts, the Company plans to adopt additional controls around internal controls over financial reporting and its business processes for any new revenue arrangements that the Company enters. The Company is on target to complete its assessment of ASU 2014-09 and the impact on the Company’s consolidated financial statements and related disclosures as of January 1, 2018. 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.

Investment In Unconsolidated Af

Investment In Unconsolidated Affiliate	6 Months Ended
	Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Investment In Unconsolidated Affiliate	Investment in Unconsolidated Affiliate LSV Asset Management The Company has an investment in LSV Asset Management (LSV), a registered investment advisor that provides investment advisory services primarily to institutions, including pension plans and investment companies. LSV is currently an investment sub-advisor for a limited number of SEI-sponsored 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 affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations. At June 30, 2017 , the Company’s total investment in LSV was $45,197 . The Company receives partnership distributions from LSV on a quarterly basis. The Company received partnership distributions from LSV of $75,142 and $67,061 in the six months ended June 30 , 2017 and 2016 , respectively. As such, the Company considers these distribution payments as returns on investment rather than returns of the Company's original investment in LSV and has therefore classified the associated cash inflows as an operating activity on the Consolidated Statements of Cash Flows. The Company’s proportionate share in the earnings of LSV was $36,315 and $30,285 during the three months ended June 30 , 2017 and 2016 , respectively. During the six months ended June 30 , 2017 and 2016 , the Company's proportionate share in the earnings of LSV was $69,880 and $59,477 , respectively. These tables contain condensed financial information of LSV: Condensed Statement of Operations Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Revenues $ 119,320 $ 95,825 $ 229,273 $ 188,478 Net income 93,372 77,790 179,587 152,247 Condensed Balance Sheets June 30, 2017 December 31, 2016 Current assets $ 128,808 $ 125,872 Non-current assets 1,683 1,927 Total assets $ 130,491 $ 127,799 Current liabilities $ 55,427 $ 39,303 Partners’ capital 75,064 88,496 Total liabilities and partners’ capital $ 130,491 $ 127,799 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 had the right to seek payment from the Company in the event of a default by LSV Employee Group III. LSV provided 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 determined that LSV Employee Group III was a variable interest entity (VIE); however, the Company was not considered the primary beneficiary because it did 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 and June 2017, LSV Employee Group III made the final principal payments related to the term loans guaranteed by LSV and the Company, respectively, and has no further obligation regarding the agreement. The Company has no other interests in LSV Employee Group III and, therefore, no longer considers LSV Employee Group III to be a VIE.

Variable Interest Entities - In

Variable Interest Entities - Investment Products	6 Months Ended
	Jun. 30, 2017
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 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 $6,606 and $9,891 in fees during the three months ended June 30, 2017 and 2016 , respectively. During the six months ended June 30 , 2017 and 2016 , the Company waived $13,678 and $22,368 , respectively, in fees.

Composition of Certain Financia

Composition of Certain Financial Statement Captions	6 Months Ended
	Jun. 30, 2017
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: June 30, 2017 December 31, 2016 Trade receivables $ 56,262 $ 48,683 Fees earned, not billed 193,943 168,971 Other receivables 13,019 10,826 263,224 228,480 Less: Allowance for doubtful accounts (680 ) (523 ) $ 262,544 $ 227,957 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: June 30, 2017 December 31, 2016 Buildings $ 154,007 $ 152,171 Equipment 111,363 106,759 Land 10,030 10,030 Purchased software 131,494 128,008 Furniture and fixtures 17,607 17,292 Leasehold improvements 16,700 15,175 Construction in progress 2,630 2,077 443,831 431,512 Less: Accumulated depreciation (298,294 ) (285,322 ) Property and Equipment, net $ 145,537 $ 146,190 The Company recognized $13,399 and $12,881 in depreciation expense related to property and equipment for the six months ended June 30 , 2017 and 2016 , respectively. Accrued Liabilities Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: June 30, 2017 December 31, 2016 Accrued employee compensation $ 48,510 $ 79,735 Accrued consulting, outsourcing and professional fees 34,822 24,428 Accrued sub-advisory, distribution and other asset management fees 36,935 41,666 Accrued dividend payable — 44,596 Other accrued liabilities 50,310 50,100 Total accrued liabilities $ 170,577 $ 240,525

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2017
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 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 fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets. The valuation of the Company's Level 2 financial assets held by SIDCO and SPTC are based upon securities pricing policies and procedures utilized by third-party pricing vendors. The pricing policies and procedures applied during the six months ended June 30 , 2017 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2016 . The Company had no Level 3 financial assets or liabilities at June 30, 2017 or December 31, 2016 . There were no transfers of financial assets between levels within the fair value hierarchy during the six months ended June 30 , 2017 . 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 June 30, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 10,172 $ 10,172 $ — Fixed-income available-for-sale securities 75,913 — 75,913 Fixed-income securities owned 21,412 — 21,412 Investment funds sponsored by LSV (1) 5,350 $ 112,847 $ 10,172 $ 97,325 Fair Value Measurements at the End of the Reporting Period Using Assets December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 9,581 $ 9,581 $ — Fixed-income available-for-sale securities 74,452 — 74,452 Fixed-income securities owned 21,339 — 21,339 Investment funds sponsored by LSV (1) 4,858 $ 110,230 $ 9,581 $ 95,791 (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	6 Months Ended
	Jun. 30, 2017
Marketable Securities [Abstract]
Marketable Securities	Marketable Securities Investments Available for Sale Investments available for sale classified as non-current assets consist of: At June 30, 2017 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,330 $ 82 $ (574 ) $ 6,838 Equities and other mutual funds 3,213 121 — 3,334 Debt securities 76,372 — (459 ) 75,913 $ 86,915 $ 203 $ (1,033 ) $ 86,085 At December 31, 2016 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,357 $ 24 $ (996 ) $ 6,385 Equities and other mutual funds 2,968 228 — 3,196 Debt securities 74,843 — (391 ) 74,452 $ 85,168 $ 252 $ (1,387 ) $ 84,033 Net unrealized losses at June 30, 2017 and December 31, 2016 were $606 (net of income tax benefit of $224 ) and $836 (net of income tax benefit of $299 ), respectively. These net unrealized losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets. There were gross realized gains of $264 and gross realized losses of $396 from available-for-sale securities during the six months ended June 30 , 2017 . There were gross realized gains of $237 and gross realized losses of $492 from available-for-sale securities during the six months ended June 30 , 2016 . Gains and losses from available-for-sale securities, including amounts reclassified from accumulated comprehensive income, are reflected in Net gain from investments on the accompanying Consolidated Statements of Operations. Investments in Affiliated Funds The Company has an investment in funds sponsored by LSV. The Company records this investment on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these funds are recognized in Net gain 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 $5,350 and $4,858 at June 30, 2017 and December 31, 2016 , respectively. The Company recognized gains of $194 and $492 during the three and six months ended June 30, 2017 , respectively, from the change in fair value of the funds. The Company recognized gains of $237 and $381 during the three and six months ended June 30, 2016 , respectively, from the change in fair value of the funds. Securities Owned The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings. The securities had a fair value of $21,412 and $21,339 at June 30, 2017 and December 31, 2016 , respectively. There were no material net gains or losses from the change in fair value of the securities during the three and six months ended June 30, 2017 and 2016 .

Line of Credit

Line of Credit	6 Months Ended
	Jun. 30, 2017
Line of Credit Facility [Abstract]
Lines of Credit	Line of Credit The Company has a five-year $300,000 Credit Agreement (the Credit Facility) with Wells Fargo Bank, National Association, and a syndicate of other lenders. The Credit Facility is scheduled to expire in 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 June 30, 2017 . The Company was in compliance with all covenants of the Credit Facility during the six months ended June 30, 2017 . During July 2017, the Company elected to borrow $40,000 under the Credit Facility for cash management purposes subsequent to the funding of an acquisition (See Note 14). As of July 20, 2017, the amount of the Credit Facility that is available for general corporate purposes was $260,000 .

Shareholders' Equity

Shareholders' Equity	6 Months Ended
	Jun. 30, 2017
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 six months ended June 30, 2017 and 2016 , respectively, as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Stock-based compensation expense $ 6,259 $ 4,189 $ 12,439 $ 7,978 Less: Deferred tax benefit (2,189 ) (1,469 ) (4,342 ) (2,768 ) Stock-based compensation expense, net of tax $ 4,070 $ 2,720 $ 8,097 $ 5,210 As of June 30, 2017 , there was approximately $64,208 of unrecognized compensation cost remaining 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 six months ended June 30 , 2017 was $37,976 . The total options exercisable as of June 30, 2017 had an intrinsic value of $176,559 . The total intrinsic value for options exercisable is calculated as the difference between the market value of the Company’s common stock as of June 30, 2017 and the weighted average exercise price of the shares. The market value of the Company’s common stock as of June 30, 2017 was $53.78 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of June 30, 2017 was $21.21 . Total options that were outstanding as of June 30, 2017 were 16,676,000 . Total options that were exercisable as of June 30, 2017 were 5,421,000 . Common Stock Buyback The Company’s Board of Directors, under multiple authorizations, has authorized the repurchase of the Company’s common stock on the open market or through private transactions. The Company purchased 2,357,000 shares at a total cost of $120,041 during the six months ended June 30 , 2017 , which reduced the total shares outstanding of common stock. The cost of stock purchases during the period includes the cost of certain transactions that settled in the following quarter. As of June 30, 2017 , the Company had approximately $98,710 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 24, 2017 , the Board of Directors declared a cash dividend of $0.28 per share on the Company's common stock, which was paid on June 16, 2017 , to shareholders of record on June 7, 2017 . Cash dividends declared during the six months ended June 30 , 2017 and 2016 were $44,264 and $42,001 , respectively.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2017
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, 2017 $ (37,119 ) $ (836 ) $ (37,955 ) Other comprehensive gain before reclassifications 9,710 141 9,851 Amounts reclassified from accumulated other comprehensive loss — 89 89 Net current-period other comprehensive gain 9,710 230 9,940 Balance, June 30, 2017 $ (27,409 ) $ (606 ) $ (28,015 )

Business Segment Information

Business Segment Information	6 Months Ended
	Jun. 30, 2017
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 to retirement plan sponsors, healthcare systems 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 six months ended June 30, 2017 and 2016 . 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, 2016 . The following tables highlight certain financial information about each of the Company’s business segments for the three months ended June 30, 2017 and 2016 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended June 30, 2017 Revenues $ 116,184 $ 92,746 $ 78,068 $ 83,616 $ 1,717 $ 372,331 Expenses 112,353 49,380 38,668 53,847 5,124 259,372 Operating profit (loss) $ 3,831 $ 43,366 $ 39,400 $ 29,769 $ (3,407 ) $ 112,959 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended June 30, 2016 Revenues $ 114,836 $ 81,883 $ 74,674 $ 70,938 $ 1,500 $ 343,831 Expenses 102,862 44,721 36,550 46,968 5,355 236,456 Operating profit (loss) $ 11,974 $ 37,162 $ 38,124 $ 23,970 $ (3,855 ) $ 107,375 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 June 30 , 2017 and 2016 is as follows: 2017 2016 Total operating profit from segments $ 112,959 $ 107,375 Corporate overhead expenses (15,732 ) (13,852 ) Income from operations $ 97,227 $ 93,523 The following tables provide additional information for the three months ended June 30 , 2017 and 2016 pertaining to our business segments: Capital Expenditures (1) Depreciation 2017 2016 2017 2016 Private Banks $ 9,479 $ 8,454 $ 4,172 $ 3,199 Investment Advisors 3,698 3,267 802 964 Institutional Investors 1,086 696 244 339 Investment Managers 8,665 1,743 1,028 1,172 Investments in New Businesses 153 121 171 547 Total from business segments $ 23,081 $ 14,281 $ 6,417 $ 6,221 Corporate overhead 392 279 182 213 $ 23,473 $ 14,560 $ 6,599 $ 6,434 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2017 2016 Private Banks $ 8,876 $ 7,769 Investment Advisors 2,897 2,585 Institutional Investors 426 425 Investment Managers 275 275 Investments in New Businesses 41 40 Total from business segments $ 12,515 $ 11,094 Corporate overhead 50 190 $ 12,565 $ 11,284 The following tables highlight certain financial information about each of the Company’s business segments for the six months ended June 30, 2017 and 2016 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Six Months Ended June 30, 2017 Revenues $ 228,818 $ 180,984 $ 155,072 $ 164,103 $ 3,338 $ 732,315 Expenses 220,903 96,919 77,496 105,912 10,004 511,234 Operating profit (loss) $ 7,915 $ 84,065 $ 77,576 $ 58,191 $ (6,666 ) $ 221,081 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Six Months Ended June 30, 2016 Revenues $ 228,197 $ 158,562 $ 147,571 $ 140,856 $ 2,908 $ 678,094 Expenses 206,603 89,495 71,932 92,243 10,587 470,860 Operating profit (loss) $ 21,594 $ 69,067 $ 75,639 $ 48,613 $ (7,679 ) $ 207,234 Gain on sale of subsidiary 2,791 — — — — 2,791 Segment profit (loss) $ 24,385 $ 69,067 $ 75,639 $ 48,613 $ (7,679 ) $ 210,025 A reconciliation of the total operating profit reported for the business segments to income from operations in the Consolidated Statements of Operations for the six months ended June 30 , 2017 and 2016 is as follows: 2017 2016 Total operating profit from segments $ 221,081 $ 207,234 Corporate overhead expenses (30,337 ) (26,899 ) Income from operations $ 190,744 $ 180,335 The following tables provide additional information for the six months ended June 30 , 2017 and 2016 pertaining to our business segments: Capital Expenditures (1) Depreciation 2017 2016 2017 2016 Private Banks $ 22,329 $ 17,166 $ 8,582 $ 6,380 Investment Advisors 8,230 6,119 1,535 1,940 Institutional Investors 1,897 1,492 471 673 Investment Managers 10,280 3,065 1,944 2,362 Investments in New Businesses 259 215 539 1,095 Total from business segments $ 42,995 $ 28,057 $ 13,071 $ 12,450 Corporate Overhead 544 589 328 431 $ 43,539 $ 28,646 $ 13,399 $ 12,881 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2017 2016 Private Banks $ 17,339 $ 15,480 Investment Advisors 5,747 5,138 Institutional Investors 749 824 Investment Managers 491 541 Investments in New Businesses 160 66 Total from business segments $ 24,486 $ 22,049 Corporate Overhead 101 247 $ 24,587 $ 22,296

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The gross liability for unrecognized tax benefits at June 30, 2017 and December 31, 2016 was $18,856 and $17,287 , respectively, exclusive of interest and penalties, of which $16,392 and $14,868 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 June 30, 2017 and December 31, 2016 , the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $1,579 and $1,224 , respectively. June 30, 2017 December 31, 2016 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 18,856 $ 17,287 Interest and penalties on unrecognized benefits 1,579 1,224 Total gross uncertain tax positions $ 20,435 $ 18,511 Amount included in Current liabilities $ 6,293 $ 3,866 Amount included in Other long-term liabilities 14,142 14,645 $ 20,435 $ 18,511 The Company's effective income tax rate for the three and six months ended June 30, 2017 and 2016 differs from the federal income tax statutory rate due to the following: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Statutory rate 35.0 % 35.0 % 35.0 % 35.0 % State taxes, net of federal tax benefit 1.7 1.4 1.7 1.4 Foreign tax expense and tax rate differential (1.0 ) (0.7 ) (1.0 ) (0.7 ) Tax benefit from stock option exercises (3.0 ) — (3.6 ) — Other, net (0.6 ) (0.5 ) (0.5 ) (0.5 ) 32.1 % 35.2 % 31.6 % 35.2 % The decrease in the tax rates for the three and six months ended June 30, 2017 was primarily due to the adoption of ASU 2016-09. Under this standard, the tax effects of stock option exercises are treated as discrete items in the reporting period in which they occur. Therefore, the tax effect of stock option exercises is not spread over the entire year through the use of the annual effective tax rate, but instead is recorded entirely in the period in which the tax deduction arose. Accordingly, the Company recorded the income tax benefit as a discrete item in income for the three and six months ended June 30, 2017. The Company's effective tax rate could fluctuate significantly on a quarterly basis due to the tax effects of stock-based compensation. 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 2013 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2010 . The Company estimates it will recognize $6,293 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	6 Months Ended
	Jun. 30, 2017
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 seven lawsuits filed in Louisiana courts; four of the cases also name SPTC as a defendant. The underlying allegations in all actions relate to the purported role of SPTC in providing back-office services to Stanford Trust Company. The complaints allege that SEI and SPTC participated in some manner in the sale of “certificates of deposit” issued by Stanford International Bank so as to be a “seller” of the certificates of deposit for purposes of primary liability under the Louisiana Securities Law or so as to be secondarily liable under that statute for sales of certificates of deposit made by Stanford Trust Company. Two of the actions also include claims for violations of the Louisiana Racketeering Act and possibly conspiracy, and a third also asserts claims of negligence, breach of contract, breach of fiduciary duty, violations of the uniform fiduciaries law, negligent misrepresentation, detrimental reliance, violations of the Louisiana Racketeering Act, and conspiracy. The procedural status of the seven cases varies. The Lillie case, filed originally in the 19th Judicial District Court for the Parish of East Baton Rouge, was brought as a class action and is procedurally the most advanced of the cases. SEI and SPTC filed exceptions, which the Court granted in part, dismissing claims under the Louisiana Unfair Trade Practices Act and permitting the claims under the Louisiana Securities Law to go forward. On March 11, 2013, newly-added insurance carrier defendants removed the case to the United States District Court for the Middle District of Louisiana. On August 7, 2013, the Judicial Panel on Multidistrict Litigation transferred the matter to the Northern District of Texas where MDL 2099, In re: Stanford Entities Securities Litigation (“the Stanford MDL”), is pending. On September 22, 2015, the District Court on the motion of SEI and SPTC dismissed plaintiffs’ claims for primary liability under Section 714(A) of the Louisiana Securities Law, but declined to dismiss plaintiffs’ claims for secondary liability under Section 714(B) of the Louisiana Securities Law based on the allegations pled by plaintiffs. 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 in Lillie 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". Notice of the pendency of the class action was mailed to potential class members on October 4, 2016. On December 1, 2016, a group of plaintiffs who opted out of the Lillie class filed a complaint against SEI and SPTC in the United States District Court in the Middle District of Louisiana, alleging claims essentially the same as those in Lillie . In January 2017, the Judicial Panel on Multidistrict Litigation transferred the proceeding to the Northern District of Texas and the Stanford MDL. During February 2017, SEI filed its response to the Complaint and in March 2017 the District Court for the Northern District of Texas approved the stipulated dismissal of all claims in this complaint predicated on Section 712(D) or Section 714(A) of the Louisiana Securities Law. Another one of the cases, filed in the 23rd Judicial District Court for the Parish of Ascension, also was removed to federal court and transferred by the Judicial Panel on Multidistrict Litigation to the Northern District of Texas and the Stanford MDL. The schedule for responding to that Complaint has not yet been established. The plaintiffs in two of the cases remaining in the Parish of East Baton Rouge have granted SEI and SPTC indefinite extensions to respond to the petitions. In the two additional cases, filed in East Baton Rouge and brought by the same counsel who filed the Lillie 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 remains uncertain, SEI and SPTC believe that they have valid defenses to plaintiffs' claims and intend to defend the lawsuits vigorously. Because of uncertainty in the make-up of the Lillie class, the specific theories of liability that may survive a motion for summary judgment or other dispositive motion, the relative 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. 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 - Depositary & Custodial Services (Ireland) Limited (D&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 D&C, damages of approximately $84 million. GFSL and D&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. The appeal is still pending. While the outcome of this action is uncertain given its early phase and the lack of specific theories of liability asserted against GFSL and D&C, each of GFSL and D&C believe that they have valid defenses to plaintiffs’ claims and intend to defend the lawsuit vigorously, and GFSL and D&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	6 Months Ended
	Jun. 30, 2017
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 a pre-tax gain of $2,791 , or $0.01 diluted earnings per share, during the six months ended June 30, 2016 representing the final annual payment under the terms of the agreement. The Company's gain from the sale of SEI AK are included in Gain on sale of subsidiary on the accompanying Consolidated Statement of Operations.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events On July 3, 2017, the Company acquired all ownership interests of Archway Technology Partners, LLC, Archway Finance & Operations, Inc. and Keystone Capital Holdings, LLC (collectively, Archway), a provider of operating technologies and services to the family office industry, from Keystone International Holdings, Inc. The purchase price paid by the Company included approximately $81,532 in cash consideration, subject to adjustment and including transaction costs, with up to an additional $8,000 payable to the seller as a contingent purchase price with respect to two one-year periods ending December 31, 2017 and 2018 depending upon whether Archway achieves specified financial measures during such periods. Archway will be integrated into the Company's Investment Managers business segment. The initial purchase accounting for this transaction has not yet been completed given the short period of time between the acquisition date and the issuance of these financial statements. Subsequent to the funding of the cash consideration for the acquisition of Archway, the Company elected to borrow $40,000 under the Credit Facility for other cash management purposes (See Note 7).

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Policy)	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017 , the results of operations for the three and six months ended June 30, 2017 and 2016 , and cash flows for the six -month periods ended June 30, 2017 and 2016 . 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, 2016 . There have been no significant changes in significant accounting policies during the six months ended June 30, 2017 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 with the exception of the adoption of Accounting Standards Update (ASU) 2016-09, Improvements to Employee Share-Based Payment Accounting (ASU 2016-09). As required by ASU 2016-09, excess tax benefits recognized on stock-based compensation expense are reflected in the accompanying Consolidated Statements of Operations as a component of the provision for income taxes on a prospective basis (See Note 11). Additionally, excess tax benefits or deficiencies recognized on stock-based compensation expense are classified as an operating activity in the accompanying Consolidated Statements of Cash Flows. The Company has applied this provision retrospectively for the periods prior to the date of adoption. As a result, for the six months ended June 30, 2016 , net cash provided by operating activities increased by $4,004 with a corresponding offset to net cash used for financing activities. ASU 2016-09 also allows for the option to account for forfeitures as they occur when determining the amount of compensation cost to be recognized, rather than estimating expected forfeitures over the course of a vesting period. The Company elected to account for forfeitures as they occur. In addition, ASU 2016-09 eliminates anticipated windfalls and shortfalls that were included in the calculation of assumed proceeds for computing the dilutive effect of share-based payment awards in the calculation of diluted earnings per share. No adjustments to the Company's prior period reported diluted earnings per share amounts were permitted by ASU 2016-09. The net cumulative effect to the Company from the adoption of ASU 2016-09 was an increase to paid-in capital of $2,582 , a reduction to retained earnings of $1,669 and an increase to deferred tax assets of $913 as of January 1, 2017.
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 In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) (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. The FASB has issued several amendments to the standard, including principal versus agent guidance and identifying performance obligations. ASU 2014-09 will become effective for the Company during the first quarter 2018. The Company continues to assess the impact of ASU 2014-09 on its revenue arrangements. The Company expects the adoption of ASU 2014-09 to have an impact to its business processes, financial reporting disclosures and internal controls over financial reporting (ICFR). As part of its project plan’s preliminary assessment and design implementation phases for the adoption of ASU 2014-09, the Company has adopted implementation controls that allows it to properly and timely adopt ASU 2014-09 on the effective date. The Company will make continuous updates to the quarterly and year-end disclosures, with a focus on both status and internal controls over financial reporting. The new standard will have a significant impact to the Company's financial statement disclosures, including identifying information that the Company will have to develop under the new standard. The Company’s implementation plan includes the following: • Developed a phased implementation project plan with a specific timeline and milestones; • Developed an understanding of the new standard and its requirements; • Analyzed the Company’s revenue streams; • Gathering and evaluating the required and relevant information for ASU 2014-09; and • Continue to monitor the impact of ASU 2014-09 and the various interpretations and supplemental guidance that become available. Upon its initial assessment, the Company has made the following observations: Revenue: • The Company offers many services which are bundled together, and provided and completed for the client on a monthly basis. In assessing these contracts, the Company expects to continue to recognize revenue for these types of services on a monthly basis as the client consumes the benefits continuously over time. Similarly, the Company expects that transaction-based and trade execution fees based on current period activity will not be affected by the adoption of ASU 2014-09. • The Company continues to assess the effect of the adoption of the new standard on the timing of the recognition of implementation fees, which are recognized in Information processing and software servicing fees as well as fund conversion fees and other ancillary fees recognized in Asset management, administration and distribution fees. While the Company has not made a final determination, the timing of the recognition for these revenues may change. • The new standard also modified some of the principal and agent considerations which may result in changes to gross or net treatment of revenue and expenses but would not affect final net income. Contract costs: • The Company is in the process of evaluating the costs of obtaining these contracts, especially for the information processing and software servicing fees revenue stream, which are affected by the standard. Sales commissions and contract costs related to fund conversions are also being evaluated. Under current guidance, contract costs are expensed at inception of an agreement but under the new standard, the costs will generally be capitalized and amortized over the period of customer life as defined in the new standard, unless a practical expedient is applied to fully expense contract costs for contracts with an amortization period of one year or less. Transition method: • The new standard provides companies with alternative methods of adoption. The Company is in the process of determining the method of adoption, which depends in part upon the completion of the evaluation of the remaining revenue arrangements. The Company expects to select the transition method by the third quarter of 2017. Upon completion of the Company’s implementation plan and evaluation of the remaining revenue contracts, the Company plans to adopt additional controls around internal controls over financial reporting and its business processes for any new revenue arrangements that the Company enters. The Company is on target to complete its assessment of ASU 2014-09 and the impact on the Company’s consolidated financial statements and related disclosures as of January 1, 2018. 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.
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 affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations.
Variable Interest Entities	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 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 fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets. The valuation of the Company's Level 2 financial assets held by SIDCO and SPTC are based upon securities pricing policies and procedures utilized by third-party pricing vendors. The pricing policies and procedures applied during the six months ended June 30 , 2017 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2016 .
Investments in Affiliated Funds	The fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets.
Available-for-sale Securities	These net unrealized losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets.
Securities Owned	The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings.

Summary of Significant Accoun23

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Calculation Of Basic And Diluted Earnings Per Share	The calculations of basic and diluted earnings per share for the three and six months ended June 30, 2017 and 2016 are: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Net income $ 91,769 $ 81,005 $ 180,506 $ 158,502 Shares used to compute basic earnings per common share 158,325,000 161,795,000 158,708,000 162,404,000 Dilutive effect of stock options 3,384,000 3,293,000 3,518,000 3,212,000 Shares used to compute diluted earnings per common share 161,709,000 165,088,000 162,226,000 165,616,000 Basic earnings per common share $ 0.58 $ 0.50 $ 1.14 $ 0.98 Diluted earnings per common share $ 0.57 $ 0.49 $ 1.11 $ 0.96
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 six months ended June 30 : 2017 2016 Net income $ 180,506 $ 158,502 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 13,399 12,881 Amortization 24,587 22,296 Equity in earnings of unconsolidated affiliate (69,880 ) (59,477 ) Distributions received from unconsolidated affiliate 75,142 67,061 Stock-based compensation 12,439 7,978 Provision for losses on receivables 157 297 Deferred income tax expense 918 (311 ) Gain from sale of SEI AK — (2,791 ) Net gain from investments (391 ) (124 ) Tax benefit on stock options exercised (1) — 4,004 Change in other long-term liabilities (503 ) 865 Change in other assets 122 1,084 Other 492 1,030 Change in current assets and liabilities Decrease (increase) in Receivables from investment products 12,713 1,032 Receivables (34,744 ) (19,357 ) Other current assets (4,378 ) (4,006 ) Increase (decrease) in Accounts payable (2,329 ) (970 ) Accrued liabilities (23,324 ) (27,634 ) Deferred revenue (71 ) 1,094 Total adjustments 4,349 4,952 Net cash provided by operating activities $ 184,855 $ 163,454 (1) The tax benefit on stock options exercised for the six months ended June 30, 2016 was reclassified to operating activities from financing activities upon the adoption of ASU 2016-09.

Investment In Unconsolidated 24

Investment In Unconsolidated Affiliate (Tables)	6 Months Ended
	Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Condensed financial information of LSV	These tables contain condensed financial information of LSV: Condensed Statement of Operations Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Revenues $ 119,320 $ 95,825 $ 229,273 $ 188,478 Net income 93,372 77,790 179,587 152,247 Condensed Balance Sheets June 30, 2017 December 31, 2016 Current assets $ 128,808 $ 125,872 Non-current assets 1,683 1,927 Total assets $ 130,491 $ 127,799 Current liabilities $ 55,427 $ 39,303 Partners’ capital 75,064 88,496 Total liabilities and partners’ capital $ 130,491 $ 127,799

Composition of Certain Financ25

Composition of Certain Financial Statement Captions (Tables)	6 Months Ended
	Jun. 30, 2017
Items Included in Consolidated Statement of Financial Condition [Abstract]
Receivables	Receivables on the accompanying Consolidated Balance Sheets consist of: June 30, 2017 December 31, 2016 Trade receivables $ 56,262 $ 48,683 Fees earned, not billed 193,943 168,971 Other receivables 13,019 10,826 263,224 228,480 Less: Allowance for doubtful accounts (680 ) (523 ) $ 262,544 $ 227,957
Property And Equipment	Property and Equipment on the accompanying Consolidated Balance Sheets consists of: June 30, 2017 December 31, 2016 Buildings $ 154,007 $ 152,171 Equipment 111,363 106,759 Land 10,030 10,030 Purchased software 131,494 128,008 Furniture and fixtures 17,607 17,292 Leasehold improvements 16,700 15,175 Construction in progress 2,630 2,077 443,831 431,512 Less: Accumulated depreciation (298,294 ) (285,322 ) Property and Equipment, net $ 145,537 $ 146,190
Accrued Liabilities	Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: June 30, 2017 December 31, 2016 Accrued employee compensation $ 48,510 $ 79,735 Accrued consulting, outsourcing and professional fees 34,822 24,428 Accrued sub-advisory, distribution and other asset management fees 36,935 41,666 Accrued dividend payable — 44,596 Other accrued liabilities 50,310 50,100 Total accrued liabilities $ 170,577 $ 240,525

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 10,172 $ 10,172 $ — Fixed-income available-for-sale securities 75,913 — 75,913 Fixed-income securities owned 21,412 — 21,412 Investment funds sponsored by LSV (1) 5,350 $ 112,847 $ 10,172 $ 97,325 Fair Value Measurements at the End of the Reporting Period Using Assets December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 9,581 $ 9,581 $ — Fixed-income available-for-sale securities 74,452 — 74,452 Fixed-income securities owned 21,339 — 21,339 Investment funds sponsored by LSV (1) 4,858 $ 110,230 $ 9,581 $ 95,791 (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)	6 Months Ended
	Jun. 30, 2017
Marketable Securities [Abstract]
Investments Available For Sale	Investments available for sale classified as non-current assets consist of: At June 30, 2017 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,330 $ 82 $ (574 ) $ 6,838 Equities and other mutual funds 3,213 121 — 3,334 Debt securities 76,372 — (459 ) 75,913 $ 86,915 $ 203 $ (1,033 ) $ 86,085 At December 31, 2016 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,357 $ 24 $ (996 ) $ 6,385 Equities and other mutual funds 2,968 228 — 3,196 Debt securities 74,843 — (391 ) 74,452 $ 85,168 $ 252 $ (1,387 ) $ 84,033

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2017
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 six months ended June 30, 2017 and 2016 , respectively, as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Stock-based compensation expense $ 6,259 $ 4,189 $ 12,439 $ 7,978 Less: Deferred tax benefit (2,189 ) (1,469 ) (4,342 ) (2,768 ) Stock-based compensation expense, net of tax $ 4,070 $ 2,720 $ 8,097 $ 5,210

Accumulated Other Comprehensi29

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2017
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, 2017 $ (37,119 ) $ (836 ) $ (37,955 ) Other comprehensive gain before reclassifications 9,710 141 9,851 Amounts reclassified from accumulated other comprehensive loss — 89 89 Net current-period other comprehensive gain 9,710 230 9,940 Balance, June 30, 2017 $ (27,409 ) $ (606 ) $ (28,015 )

Business Segment Information (T

Business Segment Information (Tables)	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017 and 2016 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended June 30, 2017 Revenues $ 116,184 $ 92,746 $ 78,068 $ 83,616 $ 1,717 $ 372,331 Expenses 112,353 49,380 38,668 53,847 5,124 259,372 Operating profit (loss) $ 3,831 $ 43,366 $ 39,400 $ 29,769 $ (3,407 ) $ 112,959 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended June 30, 2016 Revenues $ 114,836 $ 81,883 $ 74,674 $ 70,938 $ 1,500 $ 343,831 Expenses 102,862 44,721 36,550 46,968 5,355 236,456 Operating profit (loss) $ 11,974 $ 37,162 $ 38,124 $ 23,970 $ (3,855 ) $ 107,375 The following tables highlight certain financial information about each of the Company’s business segments for the six months ended June 30, 2017 and 2016 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Six Months Ended June 30, 2017 Revenues $ 228,818 $ 180,984 $ 155,072 $ 164,103 $ 3,338 $ 732,315 Expenses 220,903 96,919 77,496 105,912 10,004 511,234 Operating profit (loss) $ 7,915 $ 84,065 $ 77,576 $ 58,191 $ (6,666 ) $ 221,081 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Six Months Ended June 30, 2016 Revenues $ 228,197 $ 158,562 $ 147,571 $ 140,856 $ 2,908 $ 678,094 Expenses 206,603 89,495 71,932 92,243 10,587 470,860 Operating profit (loss) $ 21,594 $ 69,067 $ 75,639 $ 48,613 $ (7,679 ) $ 207,234 Gain on sale of subsidiary 2,791 — — — — 2,791 Segment profit (loss) $ 24,385 $ 69,067 $ 75,639 $ 48,613 $ (7,679 ) $ 210,025
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 six months ended June 30 , 2017 and 2016 is as follows: 2017 2016 Total operating profit from segments $ 221,081 $ 207,234 Corporate overhead expenses (30,337 ) (26,899 ) Income from operations $ 190,744 $ 180,335 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 June 30 , 2017 and 2016 is as follows: 2017 2016 Total operating profit from segments $ 112,959 $ 107,375 Corporate overhead expenses (15,732 ) (13,852 ) Income from operations $ 97,227 $ 93,523
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table Text Block]	The following tables provide additional information for the six months ended June 30 , 2017 and 2016 pertaining to our business segments: Capital Expenditures (1) Depreciation 2017 2016 2017 2016 Private Banks $ 22,329 $ 17,166 $ 8,582 $ 6,380 Investment Advisors 8,230 6,119 1,535 1,940 Institutional Investors 1,897 1,492 471 673 Investment Managers 10,280 3,065 1,944 2,362 Investments in New Businesses 259 215 539 1,095 Total from business segments $ 42,995 $ 28,057 $ 13,071 $ 12,450 Corporate Overhead 544 589 328 431 $ 43,539 $ 28,646 $ 13,399 $ 12,881 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2017 2016 Private Banks $ 17,339 $ 15,480 Investment Advisors 5,747 5,138 Institutional Investors 749 824 Investment Managers 491 541 Investments in New Businesses 160 66 Total from business segments $ 24,486 $ 22,049 Corporate Overhead 101 247 $ 24,587 $ 22,296 The following tables provide additional information for the three months ended June 30 , 2017 and 2016 pertaining to our business segments: Capital Expenditures (1) Depreciation 2017 2016 2017 2016 Private Banks $ 9,479 $ 8,454 $ 4,172 $ 3,199 Investment Advisors 3,698 3,267 802 964 Institutional Investors 1,086 696 244 339 Investment Managers 8,665 1,743 1,028 1,172 Investments in New Businesses 153 121 171 547 Total from business segments $ 23,081 $ 14,281 $ 6,417 $ 6,221 Corporate overhead 392 279 182 213 $ 23,473 $ 14,560 $ 6,599 $ 6,434 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2017 2016 Private Banks $ 8,876 $ 7,769 Investment Advisors 2,897 2,585 Institutional Investors 426 425 Investment Managers 275 275 Investments in New Businesses 41 40 Total from business segments $ 12,515 $ 11,094 Corporate overhead 50 190 $ 12,565 $ 11,284

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Schedule Of Interest And Penalties	June 30, 2017 December 31, 2016 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 18,856 $ 17,287 Interest and penalties on unrecognized benefits 1,579 1,224 Total gross uncertain tax positions $ 20,435 $ 18,511 Amount included in Current liabilities $ 6,293 $ 3,866 Amount included in Other long-term liabilities 14,142 14,645 $ 20,435 $ 18,511
Schedule of Effective Income Tax Rate Reconciliation	The Company's effective income tax rate for the three and six months ended June 30, 2017 and 2016 differs from the federal income tax statutory rate due to the following: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Statutory rate 35.0 % 35.0 % 35.0 % 35.0 % State taxes, net of federal tax benefit 1.7 1.4 1.7 1.4 Foreign tax expense and tax rate differential (1.0 ) (0.7 ) (1.0 ) (0.7 ) Tax benefit from stock option exercises (3.0 ) — (3.6 ) — Other, net (0.6 ) (0.5 ) (0.5 ) (0.5 ) 32.1 % 35.2 % 31.6 % 35.2 %

Summary of Significant Accoun32

Summary of Significant Accounting Policies (New Accounting Pronouncements and Changes in Accounting Principle) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to net cash provided by operating activities	$ 184,855	$ 163,454
Corresponding offset to net cash used for financing activities	$ 181,801	214,020
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to net cash provided by operating activities		4,004
Corresponding offset to net cash used for financing activities		$ 4,004
Increase to deferred tax assets			$ 913
Accounting Standards Update 2016-09 [Member] | Paid-in Capital [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cumulative effect adjustment			2,582
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cumulative effect adjustment			$ 1,669

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Cash and cash equivalents invested in SEI-sponsored money market funds	$ 660,362	$ 594,767	$ 660,362	$ 594,767	$ 695,701	$ 679,661
Restricted cash	3,502		3,502		3,500
Capitalized software development costs			33,292	$ 19,597
Net book value of capitalized software	$ 304,673		$ 304,673		295,867
Anti-dilutive employee stock options	11,255	10,388	11,267	10,447
Anti-dilutive employee stock options, per share	$ 37.68	$ 34.06	$ 37.69	$ 34.05
SEI Wealth Platform [Member]
Capitalized software development costs			$ 27,994	$ 16,120
Net book value of capitalized software	$ 283,867		283,867
Estimated useful life of the SEI Wealth Platform	15 years
Amortization expense related to the SEI Wealth Platform			24,486	22,049
SEI Wealth Platform [Member] | Weighted Average [Member]
Estimated useful life of the SEI Wealth Platform	5 years
Application for Investment Managers segment [Member]
Capitalized software development costs			5,298	$ 3,477
Net book value of capitalized software	$ 20,806		20,806
SEI Investments (Europe) Limited [Member]
Restricted cash	3,000		3,000		3,000
SEI Investments Distribution Co. (SIDCO) [Member]
Restricted cash	502		502		500
SEI-Sponsored Open-Ended Money Market Mutual Funds [Member]
Cash and cash equivalents invested in SEI-sponsored money market funds	$ 230,721		$ 230,721		$ 374,760

Summary of Significant Accoun34

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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accounting Policies [Abstract]
Net income	$ 91,769	$ 81,005	$ 180,506	$ 158,502
Shares used to compute basic earnings per common share	158,325	161,795	158,708	162,404
Dilutive effect of stock options	3,384	3,293	3,518	3,212
Shares used to compute diluted earnings per common share	161,709	165,088	162,226	165,616
Basic earnings per common share	$ 0.58	$ 0.50	$ 1.14	$ 0.98
Diluted earnings per common share	$ 0.57	$ 0.49	$ 1.11	$ 0.96

Summary of Significant Accoun35

Summary of Significant Accounting Policies (Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accounting Policies [Abstract]
Net income	$ 91,769	$ 81,005	$ 180,506	$ 158,502
Depreciation	6,599	6,434	13,399	12,881
Amortization	12,565	11,284	24,587	22,296
Equity in earnings of unconsolidated affiliate	(36,315)	(30,285)	(69,880)	(59,477)
Distributions received from unconsolidated affiliate			75,142	67,061
Stock-based compensation	6,259	4,189	12,439	7,978
Provision for losses on receivables			157	297
Deferred income tax expense			918	(311)
Gain from sale of SEI AK	$ 0	$ 0	0	(2,791)
Net gain from investments			(391)	(124)
Tax benefit on stock options exercised (1)			0	4,004
Change in other long-term liabilities			(503)	865
Change in other assets			122	1,084
Other			492	1,030
Decrease (increase) in Receivables from investment products			12,713	1,032
Decrease (increase) in Receivables			(34,744)	(19,357)
Decrease (increase) in Other current assets			(4,378)	(4,006)
Increase (decrease) in Accounts payable			(2,329)	(970)
Increase (decrease) in Accrued liabilities			(23,324)	(27,634)
Increase (decrease) in Deferred revenue			(71)	1,094
Total adjustments			4,349	4,952
Net cash provided by operating activities			$ 184,855	$ 163,454

Investment In Unconsolidated 36

Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Apr. 30, 2016	Mar. 31, 2016	Oct. 31, 2012
Investments in and Advances to Affiliates [Line Items]
Distributions received from unconsolidated affiliate			$ 75,142	$ 67,061
Company's share in the earnings of equity method investee	$ 36,315	$ 30,285	69,880	59,477
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
LSV Employee Group III [Member] | Financial Guarantee [Member]
Investments in and Advances to Affiliates [Line Items]
Amount of guarantor's obligation, maximum exposure							45,000
L S V Asset Management [Member] | Financial Guarantee [Member]
Investments in and Advances to Affiliates [Line Items]
Amount of guarantor's obligation, maximum exposure							$ 24,930
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	45,197		45,197
Distributions received from unconsolidated affiliate			75,142	67,061
Company's share in the earnings of equity method investee	$ 36,315	$ 30,285	$ 69,880	$ 59,477
Maximum [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%

Investment In Unconsolidated 37

Investment In Unconsolidated Affiliate (Condensed Statement Of Operations Of LSV) (Details) - L S V Asset Management [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]
Revenue of LSV Asset Management	$ 119,320	$ 95,825	$ 229,273	$ 188,478
Net income of LSV Asset Management	$ 93,372	$ 77,790	$ 179,587	$ 152,247

Investment in Unconsolidated 38

Investment in Unconsolidated Affiliate (Condensed Balance Sheets Of LSV) (Details) - L S V Asset Management [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Current assets	$ 128,808	$ 125,872
Non-current assets	1,683	1,927
Total assets	130,491	127,799
Current liabilities	55,427	39,303
Partners’ capital	75,064	88,496
Total liabilities and partners’ capital	$ 130,491	$ 127,799

Variable Interest Entities - 39

Variable Interest Entities - Investment Products (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
SEI-Sponsored Open-Ended Money Market Mutual Funds [Member]
Financial Support for Nonconsolidated Legal Entity [Line Items]
Fees waived according to expense limitation agreements	$ 6,606	$ 9,891	$ 13,678	$ 22,368

Composition of Certain Financ40

Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Items Included in Consolidated Statement of Financial Condition [Abstract]
Trade receivables	$ 56,262	$ 48,683
Fees earned, not billed	193,943	168,971
Other receivables	13,019	10,826
Receivables, Gross, Current	263,224	228,480
Less: Allowance for doubtful accounts	(680)	(523)
Receivables, net	$ 262,544	$ 227,957

Composition of Certain Financ41

Composition of Certain Financial Statement Captions (Property And Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Property and Equipment [Line Items]
Property and Equipment, gross	$ 443,831		$ 443,831		$ 431,512
Less: Accumulated depreciation	(298,294)		(298,294)		(285,322)
Property and Equipment, net	145,537		145,537		146,190
Depreciation expense	6,599	$ 6,434	13,399	$ 12,881
Building [Member]
Property and Equipment [Line Items]
Property and Equipment, gross	154,007		154,007		152,171
Equipment [Member]
Property and Equipment [Line Items]
Property and Equipment, gross	111,363		111,363		106,759
Land [Member]
Property and Equipment [Line Items]
Property and Equipment, gross	10,030		10,030		10,030
Purchased Software [Member]
Property and Equipment [Line Items]
Property and Equipment, gross	131,494		131,494		128,008
Furniture and Fixtures [Member]
Property and Equipment [Line Items]
Property and Equipment, gross	17,607		17,607		17,292
Leasehold Improvements [Member]
Property and Equipment [Line Items]
Property and Equipment, gross	16,700		16,700		15,175
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and Equipment, gross	$ 2,630		$ 2,630		$ 2,077

Composition of Certain Financ42

Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 48,510	$ 79,735
Accrued consulting, outsourcing and professional fees	34,822	24,428
Accrued sub-advisory, distribution and other asset management fees	36,935	41,666
Accrued dividend payable	0	44,596
Other accrued liabilities	50,310	50,100
Total accrued liabilities	$ 170,577	$ 240,525

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Of Certain Financial Assets And Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	$ 10,172	$ 9,581
Fixed-income available-for-sale securities	75,913	74,452
Fixed-income securities owned	21,412	21,339
Investment funds sponsored by LSV	5,350	4,858
Assets, fair value	112,847	110,230
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	10,172	9,581
Fixed-income available-for-sale securities	0	0
Fixed-income securities owned	0	0
Assets, fair value	10,172	9,581
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	75,913	74,452
Fixed-income securities owned	21,412	21,339
Assets, fair value	$ 97,325	$ 95,791

Marketable Securities (Narrativ

Marketable Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Schedule of Investments [Line Items]
Net unrealized losses	$ (606)		$ (606)		$ (836)
Unrealized losses during the period, income tax benefit	(224)		(224)		(299)
Available-for-sale securities, gross realized gains			264	$ 237
Available-for-sale securities, gross realized losses			396	492
Fair value of investment funds sponsored by LSV	5,350		5,350		4,858
Securities owned	21,412		21,412		21,339
Investment Funds Sponsored by LSV [Member]
Schedule of Investments [Line Items]
Fair value of investment funds sponsored by LSV	5,350		5,350		$ 4,858
Gains from investment funds sponsored by LSV	$ 194	$ 237	$ 492	$ 381

Marketable Securities (Investme

Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	$ 86,915	$ 85,168
Available-for-sale securities, accumulated gross unrealized gain, before tax	203	252
Available-for-sale securities, accumulated gross unrealized loss, before tax	(1,033)	(1,387)
Available-for-sale securities, fair value	86,085	84,033
SEI-Sponsored Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	7,330	7,357
Available-for-sale securities, accumulated gross unrealized gain, before tax	82	24
Available-for-sale securities, accumulated gross unrealized loss, before tax	(574)	(996)
Available-for-sale securities, fair value	6,838	6,385
Equities and Other Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	3,213	2,968
Available-for-sale securities, accumulated gross unrealized gain, before tax	121	228
Available-for-sale securities, accumulated gross unrealized loss, before tax	0	0
Available-for-sale securities, fair value	3,334	3,196
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	76,372	74,843
Available-for-sale securities, accumulated gross unrealized gain, before tax	0	0
Available-for-sale securities, accumulated gross unrealized loss, before tax	(459)	(391)
Available-for-sale securities, fair value	$ 75,913	$ 74,452

Line of Credit (Details)

Line of Credit (Details) - Revolving Credit Facility [Member] - USD ($)	Jul. 07, 2017	Jun. 13, 2016	Jul. 20, 2017	Jun. 30, 2017
Line of Credit Facility [Line Items]
Credit facility term of agreement		5 years
Credit facility maximum borrowing capacity		$ 300,000,000
Credit facility scheduled expiration date		Jun. 12, 2021
Credit facility stated percentage		0.00%
Credit facility accordion feature, increase limit		$ 100,000,000
Credit facility amount outstanding at reporting date				$ 0
Subsequent Event [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings	$ 40,000,000
Credit facility remaining borrowing capacity			$ 260,000,000
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. 16, 2017	May 24, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost			$ 64,208		$ 64,208
Total intrinsic value of options exercised					37,976
Aggregate intrinsic value of options exercisable			$ 176,559		$ 176,559
Market value of Company's common stock			$ 53.78		$ 53.78
Weighted average exercise price per share			$ 21.21		$ 21.21
Total options outstanding			16,676		16,676
Total options exercisable			5,421		5,421
Dividends declared per common share		$ 0.28	$ 0.28	$ 0.26	$ 0.28	$ 0.26
Cash dividends paid per common share	$ 0.28
Cash dividends declared on the Company's common stock					$ 44,264	$ 42,001
Common Stock Buyback [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased and retired					2,357
Company purchased, cost					$ 120,041
Remaining stock repurchase authorization amount			$ 98,710		$ 98,710
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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 6,259	$ 4,189	$ 12,439	$ 7,978
Less: Deferred tax benefit	(2,189)	(1,469)	(4,342)	(2,768)
Stock-based compensation expense, net of tax	$ 4,070	$ 2,720	$ 8,097	$ 5,210

Accumulated Other Comprehensi49

Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (37,955)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	9,851
Amounts reclassified from accumulated other comprehensive loss	89
Net current-period other comprehensive gain	9,940
Ending balance	(28,015)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(37,119)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	9,710
Amounts reclassified from accumulated other comprehensive loss	0
Net current-period other comprehensive gain	9,710
Ending balance	(27,409)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(836)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	141
Amounts reclassified from accumulated other comprehensive loss	89
Net current-period other comprehensive gain	230
Ending balance	$ (606)

Business Segment Information (S

Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 372,331	$ 343,831	$ 732,315	$ 678,094
Expenses	259,372	236,456	511,234	470,860
Operating profit (loss)	112,959	107,375	221,081	207,234
Gain on sale of subsidiary	0	0	0	2,791
Segment profit (loss)	112,959	107,375	221,081	210,025
Private Banks [Member]
Segment Reporting Information [Line Items]
Revenues	116,184	114,836	228,818	228,197
Expenses	112,353	102,862	220,903	206,603
Operating profit (loss)	3,831	11,974	7,915	21,594
Gain on sale of subsidiary	0	0	0	2,791
Segment profit (loss)	3,831	11,974	7,915	24,385
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Revenues	92,746	81,883	180,984	158,562
Expenses	49,380	44,721	96,919	89,495
Operating profit (loss)	43,366	37,162	84,065	69,067
Gain on sale of subsidiary	0	0	0	0
Segment profit (loss)	43,366	37,162	84,065	69,067
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Revenues	78,068	74,674	155,072	147,571
Expenses	38,668	36,550	77,496	71,932
Operating profit (loss)	39,400	38,124	77,576	75,639
Gain on sale of subsidiary	0	0	0	0
Segment profit (loss)	39,400	38,124	77,576	75,639
Investment Managers [Member]
Segment Reporting Information [Line Items]
Revenues	83,616	70,938	164,103	140,856
Expenses	53,847	46,968	105,912	92,243
Operating profit (loss)	29,769	23,970	58,191	48,613
Gain on sale of subsidiary	0	0	0	0
Segment profit (loss)	29,769	23,970	58,191	48,613
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Revenues	1,717	1,500	3,338	2,908
Expenses	5,124	5,355	10,004	10,587
Operating profit (loss)	(3,407)	(3,855)	(6,666)	(7,679)
Gain on sale of subsidiary	0	0	0	0
Segment profit (loss)	$ (3,407)	$ (3,855)	$ (6,666)	$ (7,679)

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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Total operating profit from segments above	$ 112,959	$ 107,375	$ 221,081	$ 207,234
Income from operations	97,227	93,523	190,744	180,335
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total operating profit from segments above	112,959	107,375	221,081	207,234
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Corporate overhead expenses	$ (15,732)	$ (13,852)	$ (30,337)	$ (26,899)

Business Segment Information 52

Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Capital Expenditures	$ 23,473	$ 14,560	$ 43,539	$ 28,646
Depreciation	6,599	6,434	13,399	12,881
Amortization	12,565	11,284	24,587	22,296
Private Banks [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	9,479	8,454	22,329	17,166
Depreciation	4,172	3,199	8,582	6,380
Amortization	8,876	7,769	17,339	15,480
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	3,698	3,267	8,230	6,119
Depreciation	802	964	1,535	1,940
Amortization	2,897	2,585	5,747	5,138
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	1,086	696	1,897	1,492
Depreciation	244	339	471	673
Amortization	426	425	749	824
Investment Managers [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	8,665	1,743	10,280	3,065
Depreciation	1,028	1,172	1,944	2,362
Amortization	275	275	491	541
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	153	121	259	215
Depreciation	171	547	539	1,095
Amortization	41	40	160	66
Total From Business Segments [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	23,081	14,281	42,995	28,057
Depreciation	6,417	6,221	13,071	12,450
Amortization	12,515	11,094	24,486	22,049
Corporate Overhead [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	392	279	544	589
Depreciation	182	213	328	431
Amortization	$ 50	$ 190	$ 101	$ 247

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 18,856	$ 17,287
Unrecognized tax benefits that would affect effective tax rate	16,392	14,868
Interest and penalties on unrecognized benefits	1,579	$ 1,224
Settlement and Lapse of Statute [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits within the next twelve months	$ 6,293

Income Taxes (Interest And Pena

Income Taxes (Interest And Penalties) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 18,856	$ 17,287
Interest and penalties on unrecognized benefits	1,579	1,224
Gross uncertain tax positions	20,435	18,511
Amount included in Current liabilities	6,293	3,866
Amount included in Other long-term liabilities	$ 14,142	$ 14,645

Income Taxes Income Taxes (Effe

Income Taxes Income Taxes (Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Abstract]
Statutory rate	35.00%	35.00%	35.00%	35.00%
State taxes, net of federal tax benefit	1.70%	1.40%	1.70%	1.40%
Foreign tax expense and tax rate differential	(1.00%)	(0.70%)	(1.00%)	(0.70%)
Tax benefit from stock option exercises	(3.00%)	0.00%	(3.60%)	0.00%
Other, net	(0.60%)	(0.50%)	(0.50%)	(0.50%)
Effective income tax rate	32.10%	35.20%	31.60%	35.20%

Sale of SEI Asset Korea (Narrat

Sale of SEI Asset Korea (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Mar. 28, 2013	Jun. 30, 2017	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of subsidiary	$ 0	$ 0		$ 0	$ 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
Gain on sale of subsidiary, diluted earnings per share impact, net					$ 0.01

Subsequent Events (Narrative) (

Subsequent Events (Narrative) (Details) - Subsequent Event [Member] - Archway [Member] - USD ($) $ in Thousands	Jul. 07, 2017	Jul. 03, 2017
Business Acquisition [Line Items]
Cash consideration transferred		$ 81,532
Maximum contingent purchase price payable by the Company		$ 8,000
Borrowings under Credit facility	$ 40,000