SEI Investments (SEIC) 10-Q 24 Jul 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 16, 2018
Document And Entity Information [Abstract]
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, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Trading Symbol	SEIC
Amendment Flag	false
Entity Common Stock, Shares Outstanding		156,826,030

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 693,442	$ 744,247
Restricted cash	3,509	3,505
Receivables from investment products	53,386	56,666
Receivables, net of allowance for doubtful accounts of $605 and $695	314,631	282,706
Securities owned	28,981	21,526
Other current assets	36,248	31,158
Total Current Assets	1,130,197	1,139,808
Property and Equipment, net of accumulated depreciation of $323,992 and $309,955	144,330	146,428
Capitalized Software, net of accumulated amortization of $372,249 and $350,045	312,814	310,405
Investments Available for Sale	89,019	87,983
Investments in Affiliated Funds, at fair value	5,739	6,034
Investment in Unconsolidated Affiliate	51,810	59,492
Goodwill	65,249	52,990
Intangible Assets, net of accumulated amortization of $3,248 and $1,552	33,852	28,578
Deferred Contract Costs	21,521	0
Deferred Income Taxes	2,360	2,767
Other Assets, net	33,815	18,884
Total Assets	1,890,706	1,853,369
Current Liabilities:
Accounts payable	7,519	5,268
Accrued liabilities	193,832	265,058
Deferred revenue	5,587	4,723
Total Current Liabilities	206,938	275,049
Borrowings Under Revolving Credit Facility	0	30,000
Long-term Income Taxes Payable	9,629	10,629
Deferred Income Taxes	56,871	48,472
Other Long-term Liabilities	26,386	12,380
Total Liabilities	299,824	376,530
Commitments and Contingencies
Shareholders' Equity:
Common stock, $.01 par value, 750,000 shares authorized; 156,800 and 157,069 shares issued and outstanding	1,568	1,571
Capital in excess of par value	1,094,771	1,027,709
Retained earnings	522,764	467,467
Accumulated other comprehensive loss, net	(28,221)	(19,908)
Total Shareholders' Equity	1,590,882	1,476,839
Total Liabilities and Shareholders' Equity	$ 1,890,706	$ 1,853,369

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current Assets:
Receivables, allowance for doubtful accounts	$ 605	$ 695
Property and Equipment, accumulated depreciation	323,992	309,955
Capitalized software, accumulated amortization	372,249	350,045
Intangible assets, accumulated amortization	$ 3,248	$ 1,552
Stockholders' Equity:
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	156,800,000	157,069,000
Common stock, shares outstanding	156,800,000	157,069,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Revenues	$ 404,830	$ 372,331	$ 810,428	$ 732,315
Expenses:
Subadvisory, distribution and other asset management costs	45,209	43,907	90,414	87,059
Software royalties and other information processing costs	7,977	11,319	16,695	23,290
Compensation, benefits and other personnel	127,375	109,555	251,652	218,498
Stock-based compensation	5,323	6,259	10,518	12,439
Consulting, outsourcing and professional fees	50,441	48,335	99,148	91,484
Data processing and computer related	21,133	18,990	41,724	37,315
Facilities, supplies and other costs	17,783	17,575	35,396	33,500
Amortization	12,161	12,565	24,015	24,587
Depreciation	7,138	6,599	14,260	13,399
Total expenses	294,540	275,104	583,822	541,571
Income from operations	110,290	97,227	226,606	190,744
Net (loss) gain from investments	(139)	44	(549)	391
Interest and dividend income	3,162	1,686	5,664	3,029
Interest expense	(132)	(114)	(389)	(226)
Equity in earnings of unconsolidated affiliate	41,073	36,315	81,680	69,880
Income before income taxes	154,254	135,158	313,012	263,818
Income taxes	32,577	43,389	51,497	83,312
Net income	$ 121,677	$ 91,769	$ 261,515	$ 180,506
Basic earnings per common share (in USD per share)	$ 0.77	$ 0.58	$ 1.66	$ 1.14
Shares used to compute basic earnings per share	157,542	158,325	157,488	158,708
Diluted earnings per common share (in USD per share)	$ 0.75	$ 0.57	$ 1.61	$ 1.11
Shares used to compute diluted earnings per share	162,225	161,709	162,825	162,226
Dividends declared per common share (in USD per share)	$ 0.30	$ 0.28	$ 0.30	$ 0.28
Asset management, administration and distribution fees
Revenues:
Revenues	$ 316,508	$ 289,682	$ 632,717	$ 569,143
Information processing and software servicing fees
Revenues:
Revenues	$ 88,322	$ 82,649	$ 177,711	$ 163,172

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 121,677	$ 91,769	$ 261,515	$ 180,506
Other comprehensive (loss) gain, net of tax:
Foreign currency translation adjustments	(10,203)	7,222	(6,826)	9,710
Unrealized gain (loss) on investments:
Unrealized gains (losses) during the period, net of income taxes of $(52), $(51), $372 and $(32)	32	165	(1,325)	141
Less: reclassification adjustment for losses (gains) realized in net income, net of income taxes of $(31), $(53), $(46) and $(43)	112	111	(162)	89
Unrealized gain (loss) on investments:	144	276	(1,487)	230
Total other comprehensive (loss) gain, net of tax	(10,059)	7,498	(8,313)	9,940
Comprehensive income	$ 111,618	$ 99,267	$ 253,202	$ 190,446

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) during the period, income tax	$ (52)	$ (51)	$ 372	$ (32)
Reclassification adjustment for losses realized in net income, income tax	$ (31)	$ (53)	$ (46)	$ (43)

Consolidated Condensed Statemen

Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 261,515	$ 180,506
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1)	1,361	4,351
Net cash provided by operating activities	262,876	184,857
Cash flows from investing activities:
Additions to property and equipment	(12,671)	(10,247)
Additions to capitalized software	(24,613)	(33,292)
Purchases of marketable securities	(74,957)	(28,703)
Prepayments and maturities of marketable securities	64,626	26,811
Cash paid for acquisition, net of cash acquired	(5,794)	0
Other investing activities	(10,500)	(1,450)
Net cash used in investing activities	(63,909)	(46,881)
Cash flows from financing activities:
Repayments under revolving credit facility	(30,000)	0
Purchase and retirement of common stock	(189,372)	(122,066)
Proceeds from issuance of common stock	69,958	29,127
Payment of dividends	(94,318)	(88,862)
Net cash used in financing activities	(243,732)	(181,801)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(6,036)	8,488
Net decrease in cash, cash equivalents and restricted cash	(50,801)	(35,337)
Cash, cash equivalents and restricted cash, beginning of period	747,752	699,201
Cash, cash equivalents and restricted cash, end of period	$ 696,951	$ 663,864

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2018
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 platforms 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 platforms consist of application and business process outsourcing services, professional services and transaction-based services. Revenues from investment processing platforms are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. 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 platforms consist of outsourcing services including fund and investment accounting, administration, reconciliation, investor servicing and client reporting. Revenues from investment operations platforms are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Basis of Presentation The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America. Certain financial information and accompanying note disclosure normally included in the Company’s Annual Report on Form 10-K have been condensed or omitted. The interim financial information is unaudited but reflects all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of financial position of the Company as of June 30, 2018 , the results of operations for the three and six months ended June 30, 2018 and 2017 , and cash flows for the six -month periods ended June 30, 2018 and 2017 . 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, 2017 . The Company adopted the requirements of Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606) (Accounting Standards Codification (ASC) 606 (ASC 606)) using the modified retrospective method during the six months ended June 30, 2018 . As a result of the adoption of ASC 606, the Company recorded a cumulative effect adjustment of $14,402 to retained earnings as of January 1, 2018. Prior period information has not been restated (see following caption "Revenue Recognition"). The Company also adopted ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (see Note 6) and ASU No. 2016-18, Statement of Cash Flows, Restricted Cash (Topic 230) (see following caption "Statements of Cash Flows"). All amounts and disclosures set forth in this Form 10-Q have been updated to comply with the new standards. Revenue Recognition Revenue is recognized when the transfer of control of promised goods or services under the terms of a contract with customers are satisfied in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those promised goods or services. Certain portions of the Company’s revenues involve a third party in providing goods or services to its customers. In such circumstances, the Company must determine whether the nature of its promise to the customer is to provide the underlying goods or services (the Company is the principal in the transaction and reports the transaction gross) or to arrange for a third party to provide the underlying goods or services (the entity is the agent in the transaction and reports the transaction net). ASC 606 did not change the accounting for the majority of the Company’s revenue arrangements and did not have a material impact to the Company’s consolidated financial statements. The following is a summary of the impact from the adoption of ASC 606: • The majority of the Company’s services are bundled together, and provided and completed for the client on a monthly basis. For these revenue arrangements, the Company will continue to recognize revenue on a monthly basis as the client consumes the benefits continuously over time. The timing and recognition of revenues from these arrangements did not change. • Contracts with new clients or with existing clients for new services generally include implementation fees. These fees are recognized in Information processing and software servicing fees when in connection with investment processing platforms and are recognized in Asset management, administration and distribution fees when in connection with investment operations platforms. The Company concluded that most of the current arrangements for implementation services are a distinct and separate performance obligation from the monthly recurring services. The timing and recognition of fees for most of these arrangements have not changed. However, each new revenue arrangement for implementation fees is analyzed to determine whether or not it is a distinct performance obligation. Implementation fees determined not to be a distinct performance obligation would be required to be recognized over the expected life of the client relationship along with the costs relating directly to satisfying such performance obligation. The Company will evaluate each contract in accordance with the requirements of ASC 606. • Research services provided by SIDCO, the Company’s broker-dealer subsidiary, to customers in soft-dollar arrangements were determined to be a separate performance obligation. Research services provided by a broker-dealer may be internally generated or provided by a third party and paid directly by the broker-dealer on the customer’s behalf. It was determined that SIDCO is considered an agent since it does not control the research services before they are transferred to the customer. Therefore, fees received for research services should be recorded in revenues net of amounts paid for the soft dollar arrangement. These amounts paid by the Company were previously recorded gross as an expense and, beginning January 1, 2018, are recorded net of any revenue recognized. The amounts related to soft dollar arrangements during the three months ended June 30, 2018 and 2017 were $3,265 and $3,429 , respectively. The amounts related to soft dollar arrangements during the six months ended June 30, 2018 and 2017 were $7,232 and $7,502 , respectively. • Incremental contract acquisition costs related to information processing contracts in the Private Banks segment and investment operations contracts in the Investment Managers segment will be deferred and recognized over the expected client life. These costs primarily consist of sales compensation payments to the Company's sales personnel. As a result, incremental contract acquisition costs are capitalized and subsequently amortized. The Company recorded a cumulative effect adjustment to retained earnings associated with the capitalization of contract costs. For the Company's other sales compensation payments, the Company either applies the practical expedient permitting the expensing of costs to obtain a contract when the expected amortization period is one year or less or there are no contract acquisition costs required to be deferred under the requirements of ASC 606. Cash and Cash Equivalents Cash and cash equivalents includes $314,718 and $401,292 at June 30, 2018 and December 31, 2017 , 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, 2018 and December 31, 2017 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $509 and $505 at June 30, 2018 and December 31, 2017 , 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 $24,613 and $33,292 of software development costs during the six months ended June 30, 2018 and 2017 , respectively. The Company's software development costs primarily relate to the continued development of the SEI Wealth Platform SM (the Platform). The Company capitalized $23,768 and $27,994 of software development costs for significant enhancements to the Platform during the six months ended June 30, 2018 and 2017 , respectively. As of June 30, 2018 , the net book value of the Platform was $289,376 . The net book value includes $36,189 of capitalized software development costs in-progress associated with future releases. The Platform has a weighted average remaining life of 8.4 years . Amortization expense for the Platform was $19,599 and $24,486 during the six months ended June 30, 2018 and 2017 , respectively. The Company also capitalized $845 and $5,298 of software development costs during the six months ended June 30, 2018 and 2017 , respectively, related to an application for the Investment Managers segment. The application was placed into service during the first quarter 2018 with an estimated useful life of 5 years . The net book value of the application at June 30, 2018 was $23,438 . Amortization expense for the application was $2,605 during the six months ended June 30, 2018 . Earnings per Share The calculations of basic and diluted earnings per share for the three and six months ended June 30, 2018 and 2017 are: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Net income $ 121,677 $ 91,769 $ 261,515 $ 180,506 Shares used to compute basic earnings per common share 157,542,000 158,325,000 157,488,000 158,708,000 Dilutive effect of stock options 4,683,000 3,384,000 5,337,000 3,518,000 Shares used to compute diluted earnings per common share 162,225,000 161,709,000 162,825,000 162,226,000 Basic earnings per common share $ 0.77 $ 0.58 $ 1.66 $ 1.14 Diluted earnings per common share $ 0.75 $ 0.57 $ 1.61 $ 1.11 During the three months ended June 30 , 2018 and 2017 , employee stock options to purchase 6,221,000 and 11,255,000 shares of common stock with an average exercise price of $53.33 and $37.68 , respectively, were outstanding but not included in the computation of diluted earnings per common share. During the six months ended June 30 , 2018 and 2017 , employee stock options to purchase 6,138,000 and 11,267,000 shares of common stock with an average exercise price of $53.03 and $37.69 , 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. New Accounting Pronouncements 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 updated standard is effective for the Company beginning in the first quarter of 2019. Early adoption is permitted. As part of its project plan’s preliminary assessment and design implementation phases for the adoption of ASU 2016-02, the Company has adopted implementation controls that allows it to properly and timely adopt 2016-02 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. While the Company is not yet in a position to assess the full impact of the adoption of ASU 2016-02 on its consolidated financial statements and related disclosures, the Company is currently in the process of cataloging existing lease agreements and evaluating the transition method to be elected. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13) which requires that expected credit losses relating to financial assets measured on an amortized cost basis and available-for-sale debt securities be recorded through an allowance for credit losses. ASU 2016-13 limits the amount of credit losses to be recognized for available-for-sale debt securities to the amount by which carrying value exceeds fair value and also requires the reversal of previously recognized credit losses if fair value increases. ASU 2016-13 becomes effective for the Company during the first quarter of 2020. Early adoption is permitted. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment (ASU 2017-04). The objective of ASU 2017-04 is to simplify the subsequent measurement of goodwill by entities performing their annual goodwill impairment tests by comparing the fair value of a reporting unit, including income tax effects from any tax-deductible goodwill, with its carrying amount and recognizing an impairment charge for the amount by which the carrying amount exceeds fair value. ASU 2017-04 is effective for the Company beginning in the first quarter of 2020. Early adoption is permitted. The Company is currently evaluating the impact of adopting ASU 2017-04 on its consolidated financial statements and related disclosures. In June 2018, the FASB issued ASU 2018-07, Improvements to Nonemployee Share-Based Payment Accounting (ASU 2018-07) which simplifies the accounting for nonemployee share-based payment transactions. The amendments specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor’s own operations by issuing share-based payment awards. ASU 2018-07 is effective for the Company beginning in the first quarter of 2019. The Company is currently evaluating the impact of adopting ASU 2018-07 on its consolidated financial statements and related disclosures. 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 Company adopted ASU No. 2016-18, Statement of Cash Flows, Restricted Cash (Topic 230) (ASU 2016-18) on January 1, 2018 which requires that a statement of cash flows explain the change during the period for the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The prior period was retrospectively adjusted to conform to the current period’s presentation. There was no material impact to net cash flows for the six months ended June 30, 2017 as a result of including restricted cash with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts presented on the accompanying Consolidated Condensed Statement of Cash Flows in accordance with ASU 2016-18. 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 : 2018 2017 Net income $ 261,515 $ 180,506 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 14,260 13,399 Amortization 24,015 24,587 Equity in earnings of unconsolidated affiliate (81,680 ) (69,880 ) Distributions received from unconsolidated affiliate 89,362 75,142 Stock-based compensation 10,518 12,439 Provision for losses on receivables (90 ) 157 Deferred income tax expense 4,893 918 Net loss (gain) from investments 549 (391 ) Change in long-term income taxes payable (1,000 ) — Change in other long-term liabilities 1,222 (503 ) Change in other assets (4,713 ) 122 Other (3,206 ) 494 Change in current assets and liabilities Decrease (increase) in Receivables from investment products 3,280 12,713 Receivables (31,835 ) (34,744 ) Other current assets (5,090 ) (4,378 ) Increase (decrease) in Accounts payable 2,251 (2,329 ) Accrued liabilities (22,121 ) (23,324 ) Deferred revenue 746 (71 ) Total adjustments 1,361 4,351 Net cash provided by operating activities $ 262,876 $ 184,857

Investment In Unconsolidated Af

Investment In Unconsolidated Affiliate	6 Months Ended
	Jun. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Investment In Unconsolidated Affiliate	Investment in Unconsolidated Affiliate LSV Asset Management The Company has an investment in LSV Asset Management (LSV), a registered investment advisor that provides investment advisory services primarily to institutions, including pension plans and investment companies. LSV is currently an investment sub-advisor for a limited number of SEI-sponsored investment products. The Company's partnership interest in LSV as of June 30, 2018 was 38.9 percent . 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, 2018 , the Company’s total investment in LSV was $51,810 . The Company receives partnership distributions from LSV on a quarterly basis. The Company received partnership distributions from LSV of $89,362 and $75,142 in the six months ended June 30 , 2018 and 2017 , 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 $41,073 and $36,315 during the three months ended June 30 , 2018 and 2017 , respectively. During the six months ended June 30, 2018 and 2017 , the Company’s proportionate share in the earnings of LSV was $81,680 and $69,880 , respectively. These tables contain condensed financial information of LSV: Condensed Statement of Operations Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Revenues $ 132,111 $ 119,320 $ 263,829 $ 229,273 Net income 105,605 93,372 210,011 179,587 Condensed Balance Sheets June 30, 2018 December 31, 2017 Current assets $ 153,014 $ 155,239 Non-current assets 1,520 1,407 Total assets $ 154,534 $ 156,646 Current liabilities $ 63,594 $ 46,486 Partners’ capital 90,940 110,160 Total liabilities and partners’ capital $ 154,534 $ 156,646

Variable Interest Entities - In

Variable Interest Entities - Investment Products	6 Months Ended
	Jun. 30, 2018
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 voting interest entity (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 $6,372 and $6,606 in fees during the three months ended June 30, 2018 and 2017 , respectively. During the six months ended June 30 , 2018 and 2017 , the Company waived $13,026 and $13,678

Composition of Certain Financia

Composition of Certain Financial Statement Captions	6 Months Ended
	Jun. 30, 2018
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, 2018 December 31, 2017 Trade receivables $ 85,113 $ 76,760 Fees earned, not billed 218,237 194,331 Other receivables 11,886 12,310 315,236 283,401 Less: Allowance for doubtful accounts (605 ) (695 ) $ 314,631 $ 282,706 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, 2018 December 31, 2017 Buildings $ 154,305 $ 153,961 Equipment 121,442 115,546 Land 10,557 10,030 Purchased software 138,122 134,610 Furniture and fixtures 18,007 18,114 Leasehold improvements 18,464 18,017 Construction in progress 7,425 6,105 468,322 456,383 Less: Accumulated depreciation (323,992 ) (309,955 ) Property and Equipment, net $ 144,330 $ 146,428 The Company recognized $14,260 and $13,399 in depreciation expense related to property and equipment for the six months ended June 30 , 2018 and 2017 , respectively. Accrued Liabilities Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: June 30, 2018 December 31, 2017 Accrued employee compensation $ 57,077 $ 88,960 Accrued consulting, outsourcing and professional fees 29,340 29,658 Accrued sub-advisory, distribution and other asset management fees 46,455 42,365 Accrued dividend payable — 47,179 Accrued income taxes 14,387 5,583 Other accrued liabilities 46,573 51,313 Total accrued liabilities $ 193,832 $ 265,058

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2018
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 2021 to 2041 . The fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets. The valuation of the Company's Level 2 financial assets held by SIDCO and SPTC are based upon securities pricing policies and procedures utilized by third-party pricing vendors. The pricing policies and procedures applied for our Level 1 and Level 2 financial assets during the six months ended June 30 , 2018 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2017 . The Company had no Level 3 financial assets at June 30, 2018 or December 31, 2017 that were required to be measured at fair value on a recurring basis. The Company's Level 3 financial liabilities at June 30, 2018 consist entirely of the estimated contingent consideration of $13,220 resulting from an acquisition (See Note 13). There was no material change in the fair value of the contingent consideration from the acquisition date through June 30, 2018 . The Company had no Level 3 financial liabilities as of December 31, 2017 that were required to be measured at fair value on a recurring basis. There were no transfers of financial assets between levels within the fair value hierarchy during the six months ended June 30 , 2018 . The fair value of certain financial assets of the Company was determined using the following inputs: Fair Value Measurements at the End of the Reporting Period Using Assets June 30, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 11,042 $ 11,042 $ — Fixed-income available-for-sale securities 77,977 — 77,977 Fixed-income securities owned 28,981 — 28,981 Investment funds sponsored by LSV (1) 5,739 $ 123,739 $ 11,042 $ 106,958 Fair Value Measurements at the End of the Reporting Period Using Assets December 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 11,250 $ 11,250 $ — Fixed-income available-for-sale securities 76,733 — 76,733 Fixed-income securities owned 21,526 — 21,526 Investment funds sponsored by LSV (1) 6,034 $ 115,543 $ 11,250 $ 98,259

Marketable Securities

Marketable Securities	6 Months Ended
	Jun. 30, 2018
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, 2018 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,388 $ 96 $ (355 ) $ 7,129 Equities and other mutual funds 3,461 452 — 3,913 Debt securities 80,409 — (2,432 ) 77,977 $ 91,258 $ 548 $ (2,787 ) $ 89,019 At December 31, 2017 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,369 $ 110 $ (143 ) $ 7,336 Equities and other mutual funds 3,456 458 — 3,914 Debt securities 77,745 — (1,012 ) 76,733 $ 88,570 $ 568 $ (1,155 ) $ 87,983 The Company adopted ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01) on January 1, 2018 which requires the Company to recognize all changes in fair value of available-for-sale equity securities in current period earnings. Previously, these changes in fair value were recognized as a separate component of comprehensive income. The adoption of ASU 2016-01 did not have a material impact to the Company's consolidated financial statements. Net unrealized losses at June 30, 2018 and December 31, 2017 of the Company's available-for-sale debt securities were $1,873 (net of income tax benefit of $559 ) and $779 (net of income tax benefit of $233 ), respectively. These net unrealized losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets. There were no material realized gains or losses from available-for-sale securities during the six months ended June 30 , 2018 and 2017 . Gains and losses from available-for-sale securities, including amounts reclassified from accumulated comprehensive loss, are reflected in Net (loss) gain from investments on the accompanying Consolidated Statements of Operations. Investments in Affiliated Funds The Company has an investment in funds sponsored by LSV. The Company records this investment on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these funds are recognized in Net (loss) gain from investments on the accompanying Consolidated Statements of Operations. The 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 $5,739 and $6,034 at June 30, 2018 and December 31, 2017 , respectively. The Company recognized gains of $205 and $194 during the three months ended June 30, 2018 and 2017 , respectively, from the change in fair value of the funds. The Company recognized losses of $295 and gains of $492 during the six months ended June 30, 2018 and 2017 , 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 $28,981 and $21,526 at June 30, 2018 and December 31, 2017 , respectively. There were no material net gains or losses related to the securities during the three and six months ended June 30, 2018 and 2017

Line of Credit

Line of Credit	6 Months Ended
	Jun. 30, 2018
Line of Credit Facility [Abstract]
Line 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. In July 2017, the Company borrowed $40,000 under the Credit Facility for the funding of an acquisition. In October 2017, the Company made a principal payment of $10,000 . During the six months ended June 30, 2018 , the Company made additional principal payments of $30,000 to fully repay the remaining outstanding balance of the Credit Facility. The Company was in compliance with all covenants of the Credit Facility during the six months ended June 30, 2018 . As of July 16, 2018 , the amount of the Credit Facility that is available for general corporate purposes was $300,000

Shareholders' Equity

Shareholders' Equity	6 Months Ended
	Jun. 30, 2018
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. Options granted in December 2017 include a service condition which requires a minimum two or four year waiting period from the grant date along with the attainment of the applicable financial vesting target. Earnings per share targets are established at time of grant and exclude the impact of stock-based compensation and, for earnings per share targets for the options granted in December 2017, also exclude income tax expense. The targets are measured annually on December 31. The amount of stock-based compensation expense recognized in the period is based upon management’s estimate of when the earnings per share targets may be achieved. Any change in management’s estimate could result in the remaining amount of stock-based compensation expense to be accelerated, spread out over a longer period, or reversed. This may cause volatility in the recognition of stock-based compensation expense in future periods and could materially affect the Company’s earnings. The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three and six months ended June 30, 2018 and 2017 , respectively, as follows: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Stock-based compensation expense $ 5,323 $ 6,259 $ 10,518 $ 12,439 Less: Deferred tax benefit (1,142 ) (2,189 ) (2,245 ) (4,342 ) Stock-based compensation expense, net of tax $ 4,181 $ 4,070 $ 8,273 $ 8,097 As of June 30, 2018 , there was approximately $54,314 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 , 2018 was $111,031 . The total options exercisable as of June 30, 2018 had an intrinsic value of $271,157 . 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, 2018 and the weighted average exercise price of the shares. The market value of the Company’s common stock as of June 30, 2018 was $62.52 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of June 30, 2018 was $29.36 . Total options that were outstanding as of June 30, 2018 were 14,399,000 . Total options that were exercisable as of June 30, 2018 were 8,178,000 . 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 2,751,000 shares at a total cost of $186,900 during the six months ended June 30 , 2018 , 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, 2018 , the Company had approximately $183,738 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 30, 2018 , the Board of Directors declared a cash dividend of $0.30 per share on the Company's common stock, which was paid on June 22, 2018 , to shareholders of record on June 14, 2018 . Cash dividends declared during the six months ended June 30, 2018 and 2017 were $47,139 and $44,264

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive 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, 2018 $ (19,522 ) $ (386 ) $ (19,908 ) Other comprehensive gain before reclassifications (6,826 ) (1,325 ) (8,151 ) Amounts reclassified from accumulated other comprehensive loss — (162 ) (162 ) Net current-period other comprehensive gain (6,826 ) (1,487 ) (8,313 ) Balance, June 30, 2018 $ (26,348 ) $ (1,873 ) $ (28,221 )

Business Segment Information

Business Segment Information	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Business Segment Information	Business Segment Information The Company’s reportable business segments are: Private Banks – provides outsourced investment processing and investment management platforms to banks and trust institutions, independent wealth advisers and financial advisors worldwide; Investment Advisors – provides investment management and investment processing platforms to affluent investors through a network of independent registered investment advisors, financial planners and other investment professionals in the United States; Institutional Investors – provides investment management and administrative outsourcing platforms to retirement plan sponsors, healthcare systems and not-for-profit organizations worldwide; Investment Managers – provides investment operations outsourcing platforms 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 platforms; 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, 2018 and 2017 . 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, 2017 . The following tables highlight certain financial information about each of the Company’s business segments for the three months ended June 30, 2018 and 2017 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended June 30, 2018 Revenues $ 121,126 $ 99,890 $ 83,434 $ 97,566 $ 2,814 $ 404,830 Expenses 114,842 53,052 40,871 63,321 5,940 278,026 Operating profit (loss) $ 6,284 $ 46,838 $ 42,563 $ 34,245 $ (3,126 ) $ 126,804 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 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 , 2018 and 2017 is as follows: 2018 2017 Total operating profit from segments $ 126,804 $ 112,959 Corporate overhead expenses (16,514 ) (15,732 ) Income from operations $ 110,290 $ 97,227 The following tables provide additional information for the three months ended June 30 , 2018 and 2017 pertaining to our business segments: Capital Expenditures (1) Depreciation 2018 2017 2018 2017 Private Banks $ 9,529 $ 9,479 $ 3,323 $ 4,172 Investment Advisors 4,284 3,698 1,105 802 Institutional Investors 997 1,086 452 244 Investment Managers 3,370 8,665 1,806 1,028 Investments in New Businesses 240 153 155 171 Total from business segments $ 18,420 $ 23,081 $ 6,841 $ 6,417 Corporate overhead 366 392 297 182 $ 18,786 $ 23,473 $ 7,138 $ 6,599 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2018 2017 Private Banks $ 6,747 $ 8,876 Investment Advisors 2,401 2,897 Institutional Investors 427 426 Investment Managers 2,345 275 Investments in New Businesses 184 41 Total from business segments $ 12,104 $ 12,515 Corporate overhead 57 50 $ 12,161 $ 12,565 The following tables highlight certain financial information about each of the Company’s business segments for the six months ended June 30, 2018 and 2017 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Six Months Ended June 30, 2018 Revenues $ 243,290 $ 199,082 $ 168,925 $ 194,421 $ 4,710 $ 810,428 Expenses 227,044 105,505 82,120 126,659 11,038 552,366 Operating profit (loss) $ 16,246 $ 93,577 $ 86,805 $ 67,762 $ (6,328 ) $ 258,062 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 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, 2018 and 2017 is as follows: 2018 2017 Total operating profit from segments $ 258,062 $ 221,081 Corporate overhead expenses (31,456 ) (30,337 ) Income from operations $ 226,606 $ 190,744 The following tables provide additional information for the six months ended June 30, 2018 and 2017 pertaining to our business segments: Capital Expenditures (1) Depreciation 2018 2017 2018 2017 Private Banks $ 19,768 $ 22,329 $ 6,642 $ 8,582 Investment Advisors 8,544 8,230 2,210 1,535 Institutional Investors 1,964 1,897 900 471 Investment Managers 5,890 10,280 3,615 1,944 Investments in New Businesses 444 259 305 539 Total from business segments $ 36,610 $ 42,995 $ 13,672 $ 13,071 Corporate Overhead 674 544 588 328 $ 37,284 $ 43,539 $ 14,260 $ 13,399 Amortization 2018 2017 Private Banks $ 13,374 $ 17,339 Investment Advisors 4,758 5,747 Institutional Investors 854 749 Investment Managers 4,690 491 Investments in New Businesses 224 160 Total from business segments $ 23,900 $ 24,486 Corporate Overhead 115 101 $ 24,015 $ 24,587

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The gross liability for unrecognized tax benefits at June 30, 2018 and December 31, 2017 was $15,167 and $14,480 , respectively, exclusive of interest and penalties, of which $14,546 and $13,737 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, 2018 and December 31, 2017 , the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $1,379 and $1,175 , respectively. June 30, 2018 December 31, 2017 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 15,167 $ 14,480 Interest and penalties on unrecognized benefits 1,379 1,175 Total gross uncertain tax positions $ 16,546 $ 15,655 Amount included in Current liabilities $ 2,944 $ 3,275 Amount included in Other long-term liabilities 13,602 12,380 $ 16,546 $ 15,655 The Company's effective income tax rate for the three and six months ended June 30, 2018 and 2017 differs from the federal income tax statutory rate due to the following: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Statutory rate 21.0 % 35.0 % 21.0 % 35.0 % State taxes, net of federal tax benefit 2.3 1.7 2.3 1.7 Foreign tax expense and tax rate differential (0.1 ) (1.0 ) (0.1 ) (1.0 ) Tax benefit from stock option exercises (2.0 ) (3.0 ) (6.5 ) (3.6 ) Other, net (0.1 ) (0.6 ) (0.2 ) (0.5 ) 21.1 % 32.1 % 16.5 % 31.6 % The decrease in the effective tax rates for the three and six months ended June 30, 2018 was primarily due to the tax changes enacted in the 2017 Tax Cut and Jobs Act (The Tax Act). The Tax Act was enacted on December 22, 2017 and included a permanent reduction in the corporate tax rate from 35.0 percent to 21.0 percent. The Company's effective tax rates were also positively impacted by the excess tax benefits recognized on stock-based compensation expense. The Tax Act also imposed a territorial rather than worldwide system which requires a one-time transition tax on the repatriation of previously deferred foreign earnings. The Company's estimate of the one-time transition tax as of June 30, 2018 was $11,544 . The Company made a payment of $1,000 during the six months ended June 30, 2018 . Of the remaining amount payable related to the transition tax, $915 is expected to be paid within one year and $9,629 is included in Long-term income taxes payable on the accompanying Consolidated Balance Sheet. 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 2014 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2013 . The Company estimates it will recognize $2,944

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
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

Business Acquisition

Business Acquisition	6 Months Ended
	Jun. 30, 2018
Business Combinations [Abstract]
Business Acquisition	Business Acquisition On April 2, 2018 , the Company acquired all ownership interests of Huntington Steele, LLC (Huntington Steele), a registered investment advisor based in Seattle, Washington servicing the ultra-high-net-worth market, to enhance the Company's business development and research efforts in an additional geographic region. Under the acquisition method of accounting, the total purchase price was preliminarily allocated to Huntington Steele's net tangible and intangible assets based upon their estimated fair values as of April 2, 2018 based on management’s best estimates and assumptions as of the reporting date and are considered preliminary pending finalization of valuation analyses pertaining to the intangible assets acquired and the contingent consideration. The total estimated purchase price for Huntington Steele is $19,014 , which includes $5,794 in cash consideration, net of $125 in cash acquired, and an estimated contingent purchase price of $13,220 . The contingent purchase price consists of amounts payable to the sellers upon the attainment of specified financial measures determined at various intervals over the next five years. The current portion of the contingent purchase price is included in Accrued liabilities on the accompanying Balance Sheet. The long-term portion of the contingent consideration is included in Other long-term liabilities on the accompanying Balance Sheet. The results of operations of Huntington Steele, as well as all tangible and intangible assets resulting from the transaction, are included in the Investments in New Businesses segment. Amortization expense related to the intangible assets acquired was $144 during the period ended June 30, 2018 . Any goodwill generated from the acquisition is fully deductible for income tax purposes.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets On April 2, 2018, the Company acquired all ownership interests of Huntington Steele (See Note 13). The excess purchase price over the value of the identifiable intangible assets was preliminarily allocated to goodwill and is included on the accompanying Consolidated Balance Sheet. In July 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. The total purchase price was allocated to Archway’s net tangible and intangible assets based upon their estimated fair values at the date of purchase. The excess purchase price over the value of the net tangible and identifiable intangible assets was recorded as goodwill. The total amount of goodwill from this transaction amounted to $52,990 and is included on the accompanying Consolidated Balance Sheets. The change in the gross carrying amount of the Company's goodwill and intangible assets during the six months ended June 30, 2018 was due to the acquisition of Huntington Steele. The Company recognized $1,696 of amortization expense related to the intangible assets acquired from Archway and Huntington Steele during the six months ended June 30, 2018

Revenues from Contracts with Cu

Revenues from Contracts with Customers	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenues from Contracts with Customers	Revenues from Contracts with Customers The Company’s principal sources of revenues are: (1) asset management, administration and distribution fees primarily earned based upon a contractual percentage of net assets under management or administration; and (2) information processing and software servicing fees that are either recurring and primarily earned based upon the number of trust accounts being serviced or a percentage of the total average daily market value of the clients' assets processed on the Company's platforms, or non-recurring and based upon project-oriented contractual agreements related to client implementations. Disaggregation of Revenue The following tables provide additional information pertaining to our revenues disaggregated by major product line and primary geographic market based on the location of the use of the products or services for each of the Company’s business segments for the three and six months ended June 30, 2018 : Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total Major Product Lines: For the Three Months Ended June 30, 2018 Investment management fees from pooled investment products $ 35,164 $ 72,481 $ 15,347 $ 239 $ 237 $ 123,468 Investment management fees from investment management agreements 214 23,389 67,608 80 2,549 93,840 Investment operations fees 375 — — 88,311 — 88,686 Investment processing fees - PaaS 43,915 — — 642 — 44,557 Investment processing fees - SaaS 35,453 — — 2,370 — 37,823 Professional services fees 4,195 — — 1,981 — 6,176 Account fees and other 1,810 4,020 479 3,943 28 10,280 Total revenues $ 121,126 $ 99,890 $ 83,434 $ 97,566 $ 2,814 $ 404,830 Primary Geographic Markets: United States $ 75,669 $ 99,890 $ 64,048 $ 92,845 $ 2,814 $ 335,266 United Kingdom 29,005 — 13,894 — — 42,899 Canada 11,516 — 2,134 — — 13,650 Ireland 4,936 — 3,027 4,721 — 12,684 Other — — 331 — — 331 Total revenues $ 121,126 $ 99,890 $ 83,434 $ 97,566 $ 2,814 $ 404,830 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total Major Product Lines: For the Six Months Ended June 30, 2018 Investment management fees from pooled investment products $ 70,354 $ 144,899 $ 31,205 $ 239 $ 462 $ 247,159 Investment management fees from investment management agreements 412 46,153 136,884 163 4,183 187,795 Investment operations fees 757 — — 175,766 — 176,523 Investment processing fees - PaaS 88,500 — — 1,125 — 89,625 Investment processing fees - SaaS 70,055 — — 4,735 — 74,790 Professional services fees 9,614 — — 3,868 — 13,482 Account fees and other 3,598 8,030 836 8,525 65 21,054 Total revenues $ 243,290 $ 199,082 $ 168,925 $ 194,421 $ 4,710 $ 810,428 Primary Geographic Markets: United States $ 153,802 $ 199,082 $ 128,816 $ 184,604 $ 4,710 $ 671,014 United Kingdom 56,530 — 28,681 — — 85,211 Canada 23,117 — 4,805 — — 27,922 Ireland 9,841 — 5,454 9,817 — 25,112 Other — — 1,169 — — 1,169 Total revenues $ 243,290 $ 199,082 $ 168,925 $ 194,421 $ 4,710 $ 810,428 Investment management fees from pooled investment products - Revenues associated with clients' assets invested in Company-sponsored pooled investment products. Contractual fees are stated as a percentage of the average market value of assets under management and collected on a monthly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment management fees from Investment Management agreements - Revenues based on assets of clients of the Institutional Investors segment primarily invested in Company-sponsored products. Each client is charged an investment management fee that is stated as a percentage of the average market value of all assets under management. The client is billed directly on a quarterly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Revenues associated with the separately managed account program offered through registered investment advisors located throughout the United States. The contractual fee is stated as a percentage of the average market value of all assets invested in the separately managed account and collected on a quarterly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment operations fees - Revenues earned from accounting and administrative services, distribution support services and regulatory and compliance services to investment management firms and family offices. The Company contracts directly with the investment management firm or family office. The contractual fees are stated as a percentage of net assets under administration and billed when asset valuations are finalized. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment Processing fees - Software as a Service - Revenues associated with clients that outsource investment processing technology software and computer processing by accessing our proprietary software and data center remotely but retain responsibility for all investment operations, client administration and other back-office trust operations. The contractual fee is based on a monthly fee plus additional fees determined on a per-account or per-transaction basis. The client is billed directly on a monthly basis. Revenues are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Investment Processing fees - Platform as a Service - Revenues associated with clients that outsource their entire investment operation and back-office processing functions. Through the use of the Company's proprietary platforms, the Company assumes all back-office investment processing services including investment processing, custody and safekeeping of assets, income collections, securities settlement and other related trust activities. The contractual fee is based on a monthly fee plus additional fees determined on a per-account or per-transaction basis. Contractual fees can also be stated as a percentage of the value of assets processed on the Company's platforms each month as long as the fee is in excess of a monthly contractual minimum. The client is billed directly on a monthly basis. Revenues are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Professional Services - Revenues associated with the business services migration for investment processing clients of the Private Banks segment and investment operations clients of the Investment Managers segment. In addition, Professional services include other services such as business transformation consulting. Typically, fees are stated as a contractual fixed fee. The client is billed directly and fees are collected according to the terms of the agreement. Other - Revenues associated with custody account servicing, account terminations, reimbursements received for out-of-pocket expenses, and other fees for the provision of ancillary services. Revenue is recognized by the Company when the performance obligations are satisfied and transfer of control to the client is completed. The majority of the Company’s performance obligations are satisfied and control is transferred to the client continuously. Therefore, revenue is recognized on a monthly basis. The amount of revenue recognized reflects the amount of consideration expected to be received by the Company in exchange for satisfied performance obligations. Deferred Contract Costs Deferred contract costs, which primarily consist of deferred sales commissions, were $21,521 as of June 30, 2018 . The Company deferred expenses related to contract costs of $2,267 and $4,083 during the three and six months ended June 30, 2018 , respectively. Amortization expense related to deferred contract costs were $619 and $1,201 during the three and six months ended June 30, 2018 , respectively. There was no impairment loss in relation to deferred contract costs during the six months ended June 30, 2018

Summary of Significant Accoun23

Summary of Significant Accounting Policies (Policy)	6 Months Ended
	Jun. 30, 2018
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, 2018 , the results of operations for the three and six months ended June 30, 2018 and 2017 , and cash flows for the six -month periods ended June 30, 2018 and 2017 . 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, 2017 . The Company adopted the requirements of Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606) (Accounting Standards Codification (ASC) 606 (ASC 606)) using the modified retrospective method during the six months ended June 30, 2018 . As a result of the adoption of ASC 606, the Company recorded a cumulative effect adjustment of $14,402 to retained earnings as of January 1, 2018. Prior period information has not been restated (see following caption "Revenue Recognition"). The Company also adopted ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (see Note 6) and ASU No. 2016-18, Statement of Cash Flows, Restricted Cash (Topic 230) (see following caption "Statements of Cash Flows"). All amounts and disclosures set forth in this Form 10-Q have been updated to comply with the new standards.
Revenue Recognition	Revenue Recognition Revenue is recognized when the transfer of control of promised goods or services under the terms of a contract with customers are satisfied in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those promised goods or services. Certain portions of the Company’s revenues involve a third party in providing goods or services to its customers. In such circumstances, the Company must determine whether the nature of its promise to the customer is to provide the underlying goods or services (the Company is the principal in the transaction and reports the transaction gross) or to arrange for a third party to provide the underlying goods or services (the entity is the agent in the transaction and reports the transaction net). ASC 606 did not change the accounting for the majority of the Company’s revenue arrangements and did not have a material impact to the Company’s consolidated financial statements. The following is a summary of the impact from the adoption of ASC 606: • The majority of the Company’s services are bundled together, and provided and completed for the client on a monthly basis. For these revenue arrangements, the Company will continue to recognize revenue on a monthly basis as the client consumes the benefits continuously over time. The timing and recognition of revenues from these arrangements did not change. • Contracts with new clients or with existing clients for new services generally include implementation fees. These fees are recognized in Information processing and software servicing fees when in connection with investment processing platforms and are recognized in Asset management, administration and distribution fees when in connection with investment operations platforms. The Company concluded that most of the current arrangements for implementation services are a distinct and separate performance obligation from the monthly recurring services. The timing and recognition of fees for most of these arrangements have not changed. However, each new revenue arrangement for implementation fees is analyzed to determine whether or not it is a distinct performance obligation. Implementation fees determined not to be a distinct performance obligation would be required to be recognized over the expected life of the client relationship along with the costs relating directly to satisfying such performance obligation. The Company will evaluate each contract in accordance with the requirements of ASC 606. • Research services provided by SIDCO, the Company’s broker-dealer subsidiary, to customers in soft-dollar arrangements were determined to be a separate performance obligation. Research services provided by a broker-dealer may be internally generated or provided by a third party and paid directly by the broker-dealer on the customer’s behalf. It was determined that SIDCO is considered an agent since it does not control the research services before they are transferred to the customer. Therefore, fees received for research services should be recorded in revenues net of amounts paid for the soft dollar arrangement. These amounts paid by the Company were previously recorded gross as an expense and, beginning January 1, 2018, are recorded net of any revenue recognized. The amounts related to soft dollar arrangements during the three months ended June 30, 2018 and 2017 were $3,265 and $3,429 , respectively. The amounts related to soft dollar arrangements during the six months ended June 30, 2018 and 2017 were $7,232 and $7,502 , respectively. •
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents includes $314,718 and $401,292 at June 30, 2018 and December 31, 2017
Restricted Cash	Restricted Cash Restricted cash includes $3,000 at June 30, 2018 and December 31, 2017 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $509 and $505 at June 30, 2018 and December 31, 2017
Reclassifications	ReclassificationsCertain prior year amounts have been reclassified to conform to current year presentation.
New Accounting Pronouncements	New Accounting Pronouncements 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 updated standard is effective for the Company beginning in the first quarter of 2019. Early adoption is permitted. As part of its project plan’s preliminary assessment and design implementation phases for the adoption of ASU 2016-02, the Company has adopted implementation controls that allows it to properly and timely adopt 2016-02 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. While the Company is not yet in a position to assess the full impact of the adoption of ASU 2016-02 on its consolidated financial statements and related disclosures, the Company is currently in the process of cataloging existing lease agreements and evaluating the transition method to be elected. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13) which requires that expected credit losses relating to financial assets measured on an amortized cost basis and available-for-sale debt securities be recorded through an allowance for credit losses. ASU 2016-13 limits the amount of credit losses to be recognized for available-for-sale debt securities to the amount by which carrying value exceeds fair value and also requires the reversal of previously recognized credit losses if fair value increases. ASU 2016-13 becomes effective for the Company during the first quarter of 2020. Early adoption is permitted. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment (ASU 2017-04). The objective of ASU 2017-04 is to simplify the subsequent measurement of goodwill by entities performing their annual goodwill impairment tests by comparing the fair value of a reporting unit, including income tax effects from any tax-deductible goodwill, with its carrying amount and recognizing an impairment charge for the amount by which the carrying amount exceeds fair value. ASU 2017-04 is effective for the Company beginning in the first quarter of 2020. Early adoption is permitted. The Company is currently evaluating the impact of adopting ASU 2017-04 on its consolidated financial statements and related disclosures. In June 2018, the FASB issued ASU 2018-07, Improvements to Nonemployee Share-Based Payment Accounting (ASU 2018-07) which simplifies the accounting for nonemployee share-based payment transactions. The amendments specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor’s own operations by issuing share-based payment awards. ASU 2018-07 is effective for the Company beginning in
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 voting interest entity (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 2021 to 2041 . The fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets. The valuation of the Company's Level 2 financial assets held by SIDCO and SPTC are based upon securities pricing policies and procedures utilized by third-party pricing vendors. The pricing policies and procedures applied for our Level 1 and Level 2 financial assets during the six months ended June 30 , 2018 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2017 . The Company had no Level 3 financial assets at June 30, 2018 or December 31, 2017
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 Accoun24

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2018
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, 2018 and 2017 are: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Net income $ 121,677 $ 91,769 $ 261,515 $ 180,506 Shares used to compute basic earnings per common share 157,542,000 158,325,000 157,488,000 158,708,000 Dilutive effect of stock options 4,683,000 3,384,000 5,337,000 3,518,000 Shares used to compute diluted earnings per common share 162,225,000 161,709,000 162,825,000 162,226,000 Basic earnings per common share $ 0.77 $ 0.58 $ 1.66 $ 1.14 Diluted earnings per common share $ 0.75 $ 0.57 $ 1.61 $ 1.11
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 : 2018 2017 Net income $ 261,515 $ 180,506 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 14,260 13,399 Amortization 24,015 24,587 Equity in earnings of unconsolidated affiliate (81,680 ) (69,880 ) Distributions received from unconsolidated affiliate 89,362 75,142 Stock-based compensation 10,518 12,439 Provision for losses on receivables (90 ) 157 Deferred income tax expense 4,893 918 Net loss (gain) from investments 549 (391 ) Change in long-term income taxes payable (1,000 ) — Change in other long-term liabilities 1,222 (503 ) Change in other assets (4,713 ) 122 Other (3,206 ) 494 Change in current assets and liabilities Decrease (increase) in Receivables from investment products 3,280 12,713 Receivables (31,835 ) (34,744 ) Other current assets (5,090 ) (4,378 ) Increase (decrease) in Accounts payable 2,251 (2,329 ) Accrued liabilities (22,121 ) (23,324 ) Deferred revenue 746 (71 ) Total adjustments 1,361 4,351 Net cash provided by operating activities $ 262,876 $ 184,857

Investment In Unconsolidated 25

Investment In Unconsolidated Affiliate (Tables)	6 Months Ended
	Jun. 30, 2018
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, 2018 2017 2018 2017 Revenues $ 132,111 $ 119,320 $ 263,829 $ 229,273 Net income 105,605 93,372 210,011 179,587 Condensed Balance Sheets June 30, 2018 December 31, 2017 Current assets $ 153,014 $ 155,239 Non-current assets 1,520 1,407 Total assets $ 154,534 $ 156,646 Current liabilities $ 63,594 $ 46,486 Partners’ capital 90,940 110,160 Total liabilities and partners’ capital $ 154,534 $ 156,646

Composition of Certain Financ26

Composition of Certain Financial Statement Captions (Tables)	6 Months Ended
	Jun. 30, 2018
Items Included in Consolidated Statement of Financial Condition [Abstract]
Receivables	Receivables on the accompanying Consolidated Balance Sheets consist of: June 30, 2018 December 31, 2017 Trade receivables $ 85,113 $ 76,760 Fees earned, not billed 218,237 194,331 Other receivables 11,886 12,310 315,236 283,401 Less: Allowance for doubtful accounts (605 ) (695 ) $ 314,631 $ 282,706
Property And Equipment	Property and Equipment on the accompanying Consolidated Balance Sheets consists of: June 30, 2018 December 31, 2017 Buildings $ 154,305 $ 153,961 Equipment 121,442 115,546 Land 10,557 10,030 Purchased software 138,122 134,610 Furniture and fixtures 18,007 18,114 Leasehold improvements 18,464 18,017 Construction in progress 7,425 6,105 468,322 456,383 Less: Accumulated depreciation (323,992 ) (309,955 ) Property and Equipment, net $ 144,330 $ 146,428
Accrued Liabilities	Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: June 30, 2018 December 31, 2017 Accrued employee compensation $ 57,077 $ 88,960 Accrued consulting, outsourcing and professional fees 29,340 29,658 Accrued sub-advisory, distribution and other asset management fees 46,455 42,365 Accrued dividend payable — 47,179 Accrued income taxes 14,387 5,583 Other accrued liabilities 46,573 51,313 Total accrued liabilities $ 193,832 $ 265,058

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Of Certain Financial Assets And Liabilities	The fair value of certain financial assets of the Company was determined using the following inputs: Fair Value Measurements at the End of the Reporting Period Using Assets June 30, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 11,042 $ 11,042 $ — Fixed-income available-for-sale securities 77,977 — 77,977 Fixed-income securities owned 28,981 — 28,981 Investment funds sponsored by LSV (1) 5,739 $ 123,739 $ 11,042 $ 106,958 Fair Value Measurements at the End of the Reporting Period Using Assets December 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 11,250 $ 11,250 $ — Fixed-income available-for-sale securities 76,733 — 76,733 Fixed-income securities owned 21,526 — 21,526 Investment funds sponsored by LSV (1) 6,034 $ 115,543 $ 11,250 $ 98,259

Marketable Securities (Tables)

Marketable Securities (Tables)	6 Months Ended
	Jun. 30, 2018
Marketable Securities [Abstract]
Investments Available For Sale	Investments available for sale classified as non-current assets consist of: At June 30, 2018 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,388 $ 96 $ (355 ) $ 7,129 Equities and other mutual funds 3,461 452 — 3,913 Debt securities 80,409 — (2,432 ) 77,977 $ 91,258 $ 548 $ (2,787 ) $ 89,019 At December 31, 2017 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,369 $ 110 $ (143 ) $ 7,336 Equities and other mutual funds 3,456 458 — 3,914 Debt securities 77,745 — (1,012 ) 76,733 $ 88,570 $ 568 $ (1,155 ) $ 87,983

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2018
Stockholders' Equity Note [Abstract]
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan	The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three and six months ended June 30, 2018 and 2017 , respectively, as follows: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Stock-based compensation expense $ 5,323 $ 6,259 $ 10,518 $ 12,439 Less: Deferred tax benefit (1,142 ) (2,189 ) (2,245 ) (4,342 ) Stock-based compensation expense, net of tax $ 4,181 $ 4,070 $ 8,273 $ 8,097

Accumulated Other Comprehensi30

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2018
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, 2018 $ (19,522 ) $ (386 ) $ (19,908 ) Other comprehensive gain before reclassifications (6,826 ) (1,325 ) (8,151 ) Amounts reclassified from accumulated other comprehensive loss — (162 ) (162 ) Net current-period other comprehensive gain (6,826 ) (1,487 ) (8,313 ) Balance, June 30, 2018 $ (26,348 ) $ (1,873 ) $ (28,221 )

Business Segment Information (T

Business Segment Information (Tables)	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
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, 2018 and 2017 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended June 30, 2018 Revenues $ 121,126 $ 99,890 $ 83,434 $ 97,566 $ 2,814 $ 404,830 Expenses 114,842 53,052 40,871 63,321 5,940 278,026 Operating profit (loss) $ 6,284 $ 46,838 $ 42,563 $ 34,245 $ (3,126 ) $ 126,804 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 six months ended June 30, 2018 and 2017 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Six Months Ended June 30, 2018 Revenues $ 243,290 $ 199,082 $ 168,925 $ 194,421 $ 4,710 $ 810,428 Expenses 227,044 105,505 82,120 126,659 11,038 552,366 Operating profit (loss) $ 16,246 $ 93,577 $ 86,805 $ 67,762 $ (6,328 ) $ 258,062 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
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, 2018 and 2017 is as follows: 2018 2017 Total operating profit from segments $ 258,062 $ 221,081 Corporate overhead expenses (31,456 ) (30,337 ) Income from operations $ 226,606 $ 190,744 three months ended June 30 , 2018 and 2017 is as follows: 2018 2017 Total operating profit from segments $ 126,804 $ 112,959 Corporate overhead expenses (16,514 ) (15,732 ) Income from operations $ 110,290 $ 97,227
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated	The following tables provide additional information for the six months ended June 30, 2018 and 2017 pertaining to our business segments: Capital Expenditures (1) Depreciation 2018 2017 2018 2017 Private Banks $ 19,768 $ 22,329 $ 6,642 $ 8,582 Investment Advisors 8,544 8,230 2,210 1,535 Institutional Investors 1,964 1,897 900 471 Investment Managers 5,890 10,280 3,615 1,944 Investments in New Businesses 444 259 305 539 Total from business segments $ 36,610 $ 42,995 $ 13,672 $ 13,071 Corporate Overhead 674 544 588 328 $ 37,284 $ 43,539 $ 14,260 $ 13,399 Amortization 2018 2017 Private Banks $ 13,374 $ 17,339 Investment Advisors 4,758 5,747 Institutional Investors 854 749 Investment Managers 4,690 491 Investments in New Businesses 224 160 Total from business segments $ 23,900 $ 24,486 Corporate Overhead 115 101 $ 24,015 $ 24,587 three months ended June 30 , 2018 and 2017 pertaining to our business segments: Capital Expenditures (1) Depreciation 2018 2017 2018 2017 Private Banks $ 9,529 $ 9,479 $ 3,323 $ 4,172 Investment Advisors 4,284 3,698 1,105 802 Institutional Investors 997 1,086 452 244 Investment Managers 3,370 8,665 1,806 1,028 Investments in New Businesses 240 153 155 171 Total from business segments $ 18,420 $ 23,081 $ 6,841 $ 6,417 Corporate overhead 366 392 297 182 $ 18,786 $ 23,473 $ 7,138 $ 6,599 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2018 2017 Private Banks $ 6,747 $ 8,876 Investment Advisors 2,401 2,897 Institutional Investors 427 426 Investment Managers 2,345 275 Investments in New Businesses 184 41 Total from business segments $ 12,104 $ 12,515 Corporate overhead 57 50 $ 12,161 $ 12,565

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Schedule Of Interest And Penalties	June 30, 2018 December 31, 2017 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 15,167 $ 14,480 Interest and penalties on unrecognized benefits 1,379 1,175 Total gross uncertain tax positions $ 16,546 $ 15,655 Amount included in Current liabilities $ 2,944 $ 3,275 Amount included in Other long-term liabilities 13,602 12,380 $ 16,546 $ 15,655
Schedule of Effective Income Tax Rate Reconciliation	The Company's effective income tax rate for the three and six months ended June 30, 2018 and 2017 differs from the federal income tax statutory rate due to the following: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Statutory rate 21.0 % 35.0 % 21.0 % 35.0 % State taxes, net of federal tax benefit 2.3 1.7 2.3 1.7 Foreign tax expense and tax rate differential (0.1 ) (1.0 ) (0.1 ) (1.0 ) Tax benefit from stock option exercises (2.0 ) (3.0 ) (6.5 ) (3.6 ) Other, net (0.1 ) (0.6 ) (0.2 ) (0.5 ) 21.1 % 32.1 % 16.5 % 31.6 %

Revenues from Contracts with 33

Revenues from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables provide additional information pertaining to our revenues disaggregated by major product line and primary geographic market based on the location of the use of the products or services for each of the Company’s business segments for the three and six months ended June 30, 2018 : Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total Major Product Lines: For the Three Months Ended June 30, 2018 Investment management fees from pooled investment products $ 35,164 $ 72,481 $ 15,347 $ 239 $ 237 $ 123,468 Investment management fees from investment management agreements 214 23,389 67,608 80 2,549 93,840 Investment operations fees 375 — — 88,311 — 88,686 Investment processing fees - PaaS 43,915 — — 642 — 44,557 Investment processing fees - SaaS 35,453 — — 2,370 — 37,823 Professional services fees 4,195 — — 1,981 — 6,176 Account fees and other 1,810 4,020 479 3,943 28 10,280 Total revenues $ 121,126 $ 99,890 $ 83,434 $ 97,566 $ 2,814 $ 404,830 Primary Geographic Markets: United States $ 75,669 $ 99,890 $ 64,048 $ 92,845 $ 2,814 $ 335,266 United Kingdom 29,005 — 13,894 — — 42,899 Canada 11,516 — 2,134 — — 13,650 Ireland 4,936 — 3,027 4,721 — 12,684 Other — — 331 — — 331 Total revenues $ 121,126 $ 99,890 $ 83,434 $ 97,566 $ 2,814 $ 404,830 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total Major Product Lines: For the Six Months Ended June 30, 2018 Investment management fees from pooled investment products $ 70,354 $ 144,899 $ 31,205 $ 239 $ 462 $ 247,159 Investment management fees from investment management agreements 412 46,153 136,884 163 4,183 187,795 Investment operations fees 757 — — 175,766 — 176,523 Investment processing fees - PaaS 88,500 — — 1,125 — 89,625 Investment processing fees - SaaS 70,055 — — 4,735 — 74,790 Professional services fees 9,614 — — 3,868 — 13,482 Account fees and other 3,598 8,030 836 8,525 65 21,054 Total revenues $ 243,290 $ 199,082 $ 168,925 $ 194,421 $ 4,710 $ 810,428 Primary Geographic Markets: United States $ 153,802 $ 199,082 $ 128,816 $ 184,604 $ 4,710 $ 671,014 United Kingdom 56,530 — 28,681 — — 85,211 Canada 23,117 — 4,805 — — 27,922 Ireland 9,841 — 5,454 9,817 — 25,112 Other — — 1,169 — — 1,169 Total revenues $ 243,290 $ 199,082 $ 168,925 $ 194,421 $ 4,710 $ 810,428

Summary of Significant Accoun34

Summary of Significant Accounting Policies (New Accounting Pronouncements and Changes in Accounting Principle) (Details) $ in Thousands	Jan. 01, 2018USD ($)
Accounting Standards Update 2014-09 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cumulative effect adjustment	$ 14,402

Summary of Significant Accoun35

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Summary of Significant Accounting Policies [Line Items]
Expense related to soft dollar arrangement	$ 3,265	$ 3,429	$ 7,232	$ 7,502
Cash and cash equivalents invested in SEI-sponsored money market funds	693,442		693,442		$ 744,247
Restricted cash	3,509		3,509		3,505
Capitalized software development costs			24,613	$ 33,292
Net book value of capitalized software	$ 312,814		$ 312,814		310,405
Anti-dilutive employee stock options	6,221	11,255	6,138	11,267
Anti-dilutive employee stock options, per share	$ 53.33	$ 37.68	$ 53.03	$ 37.69
SEI Wealth Platform
Summary of Significant Accounting Policies [Line Items]
Capitalized software development costs			$ 23,768	$ 27,994
Net book value of capitalized software	$ 289,376		289,376
Capitalized software in progress	$ 36,189		36,189
Amortization expense of capitalized software			19,599	24,486
SEI Wealth Platform | Weighted Average
Summary of Significant Accounting Policies [Line Items]
Estimated useful life of capitalized software	8 years 4 months 24 days
Application for Investment Managers segment [Member]
Summary of Significant Accounting Policies [Line Items]
Capitalized software development costs			845	$ 5,298
Net book value of capitalized software	$ 23,438		23,438
Estimated useful life of capitalized software	5 years
Amortization expense of capitalized software			2,605
SEI Investments (Europe) Limited
Summary of Significant Accounting Policies [Line Items]
Restricted cash	$ 3,000		3,000		3,000
SEI Investments Distribution Co. (SIDCO)
Summary of Significant Accounting Policies [Line Items]
Restricted cash	509		509		505
SEI-Sponsored Open-Ended Money Market Mutual Funds
Summary of Significant Accounting Policies [Line Items]
Cash and cash equivalents invested in SEI-sponsored money market funds	$ 314,718		$ 314,718		$ 401,292

Summary of Significant Accoun36

Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounting Policies [Abstract]
Net income	$ 121,677	$ 91,769	$ 261,515	$ 180,506
Shares used to compute basic earnings per common share	157,542	158,325	157,488	158,708
Dilutive effect of stock options (in shares)	4,683	3,384	5,337	3,518
Shares used to compute diluted earnings per common share	162,225	161,709	162,825	162,226
Basic earnings per common share (in USD per share)	$ 0.77	$ 0.58	$ 1.66	$ 1.14
Diluted earnings per common share (in USD per share)	$ 0.75	$ 0.57	$ 1.61	$ 1.11

Summary of Significant Accoun37

Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounting Policies [Abstract]
Net income	$ 121,677	$ 91,769	$ 261,515	$ 180,506
Depreciation	7,138	6,599	14,260	13,399
Amortization	12,161	12,565	24,015	24,587
Equity in earnings of unconsolidated affiliate	(41,073)	(36,315)	(81,680)	(69,880)
Distributions received from unconsolidated affiliate			89,362	75,142
Stock-based compensation	$ 5,323	$ 6,259	10,518	12,439
Provision for losses on receivables			(90)	157
Deferred income tax expense			4,893	918
Net loss (gain) from investments			549	(391)
Change in long-term income taxes payable			(1,000)	0
Change in other long-term liabilities			1,222	(503)
Change in other assets			(4,713)	122
Other			(3,206)	494
Decrease (increase) in Receivables from investment products			3,280	12,713
Decrease (increase) in Receivables			(31,835)	(34,744)
Decrease (increase) in Other current assets			(5,090)	(4,378)
Increase (decrease) in Accounts payable			2,251	(2,329)
Increase (decrease) in Accrued liabilities			(22,121)	(23,324)
Increase (decrease) in Deferred revenue			746	(71)
Total adjustments			1,361	4,351
Net cash provided by operating activities			$ 262,876	$ 184,857

Investment In Unconsolidated 38

Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments in and Advances to Affiliates [Line Items]
Distributions received from unconsolidated affiliate			$ 89,362	$ 75,142
Company's share in the earnings of equity method investee	$ 41,073	$ 36,315	$ 81,680	69,880
LSV Asset Management
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage	38.90%		38.90%
Total investment in equity method investee	$ 51,810		$ 51,810
Distributions received from unconsolidated affiliate			89,362	75,142
Company's share in the earnings of equity method investee	$ 41,073	$ 36,315	$ 81,680	$ 69,880

Investment In Unconsolidated 39

Investment In Unconsolidated Affiliate (Statement of Operations) (Details) - LSV Asset Management - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Equity Method Investments [Line Items]
Revenues	$ 132,111	$ 119,320	$ 263,829	$ 229,273
Net income	$ 105,605	$ 93,372	$ 210,011	$ 179,587

Investment in Unconsolidated 40

Investment in Unconsolidated Affiliate (Balance Sheets) (Details) - LSV Asset Management - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Current assets	$ 153,014	$ 155,239
Non-current assets	1,520	1,407
Total assets	154,534	156,646
Current liabilities	63,594	46,486
Partners’ capital	90,940	110,160
Total liabilities and partners’ capital	$ 154,534	$ 156,646

Variable Interest Entities - 41

Variable Interest Entities - Investment Products (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
SEI-Sponsored Open-Ended Money Market Mutual Funds
Financial Support for Nonconsolidated Legal Entity [Line Items]
Fees waived according to expense limitation agreements	$ 6,372	$ 6,606	$ 13,026	$ 13,678

Composition of Certain Financ42

Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Items Included in Consolidated Statement of Financial Condition [Abstract]
Trade receivables	$ 85,113	$ 76,760
Fees earned, not billed	218,237	194,331
Other receivables	11,886	12,310
Receivables, Gross, Current	315,236	283,401
Less: Allowance for doubtful accounts	(605)	(695)
Receivables, net	$ 314,631	$ 282,706

Composition of Certain Financ43

Composition of Certain Financial Statement Captions (Property And Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Property and Equipment [Line Items]
Property and Equipment, gross	$ 468,322		$ 468,322		$ 456,383
Less: Accumulated depreciation	(323,992)		(323,992)		(309,955)
Property and Equipment, net	144,330		144,330		146,428
Depreciation expense	7,138	$ 6,599	14,260	$ 13,399
Buildings
Property and Equipment [Line Items]
Property and Equipment, gross	154,305		154,305		153,961
Equipment
Property and Equipment [Line Items]
Property and Equipment, gross	121,442		121,442		115,546
Land
Property and Equipment [Line Items]
Property and Equipment, gross	10,557		10,557		10,030
Purchased software
Property and Equipment [Line Items]
Property and Equipment, gross	138,122		138,122		134,610
Furniture and fixtures
Property and Equipment [Line Items]
Property and Equipment, gross	18,007		18,007		18,114
Leasehold improvements
Property and Equipment [Line Items]
Property and Equipment, gross	18,464		18,464		18,017
Construction in progress
Property and Equipment [Line Items]
Property and Equipment, gross	$ 7,425		$ 7,425		$ 6,105

Composition of Certain Financ44

Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 57,077	$ 88,960
Accrued consulting, outsourcing and professional fees	29,340	29,658
Accrued sub-advisory, distribution and other asset management fees	46,455	42,365
Accrued dividend payable	0	47,179
Accrued income taxes	14,387	5,583
Other accrued liabilities	46,573	51,313
Total accrued liabilities	$ 193,832	$ 265,058

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Apr. 02, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	$ 11,042		$ 11,250
Fixed-income available-for-sale securities	77,977		76,733
Fixed-income securities owned	28,981		21,526
Investment funds sponsored by LSV	5,739		6,034
Assets, fair value	123,739		115,543
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	11,042		11,250
Fixed-income available-for-sale securities	0		0
Fixed-income securities owned	0		0
Assets, fair value	11,042		11,250
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	0		0
Fixed-income available-for-sale securities	77,977		76,733
Fixed-income securities owned	28,981		21,526
Assets, fair value	$ 106,958		$ 98,259
Huntington Steele, LLC
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent purchase price		$ 13,220

Marketable Securities (Narrativ

Marketable Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Investments [Line Items]
Net unrealized losses	$ 1,873		$ 1,873		$ 779
Unrealized losses during the period, income tax benefit	559		559		233
Investments in Affiliated Funds, at fair value	5,739		5,739		6,034
Securities owned	28,981		28,981		21,526
Investment Funds Sponsored by LSV
Schedule of Investments [Line Items]
Investments in Affiliated Funds, at fair value	5,739		5,739		$ 6,034
Gains (losses) from investment funds sponsored by LSV	$ 205	$ 194	$ (295)	$ 492

Marketable Securities (Investme

Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Equity Securities:
Fair Value	$ 11,042	$ 11,250
Debt Securities:
Fair Value	77,977	76,733
Cost Amount	91,258	88,570
Gross Unrealized Gains	548	568
Gross Unrealized (Losses)	2,787	1,155
Fair Value	89,019	87,983
SEI-sponsored mutual funds
Equity Securities:
Cost Amount	7,388	7,369
Gross Unrealized Gains	96	110
Gross Unrealized (Losses)	355	143
Fair Value	7,129	7,336
Equities and other mutual funds
Equity Securities:
Cost Amount	3,461	3,456
Gross Unrealized Gains	452	458
Gross Unrealized (Losses)	0	0
Fair Value	3,913	3,914
Debt securities
Debt Securities:
Cost Amount	80,409	77,745
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(2,432)	(1,012)
Fair Value	$ 77,977	$ 76,733

Line of Credit (Details)

Line of Credit (Details) - USD ($)	Jun. 13, 2016	Oct. 31, 2017	Jul. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jul. 16, 2018
Line of Credit Facility [Line Items]
Credit facility principal payment				$ 30,000,000	$ 0
Revolving Credit Facility
Line of Credit Facility [Line Items]
Credit facility term of agreement	5 years
Credit facility maximum borrowing capacity	$ 300,000,000
Credit facility stated percentage	0.00%
Credit facility accordion feature, increase limit	$ 100,000,000
Credit facility borrowings			$ 40,000,000
Credit facility principal payment		$ 10,000,000		$ 30,000,000
Revolving Credit Facility | Subsequent Event
Line of Credit Facility [Line Items]
Credit facility remaining borrowing capacity						$ 300,000,000
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.00%
Revolving Credit Facility | Federal Funds Rate
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	0.50%
Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion	0.15%
Revolving Credit Facility | Minimum | Lender's Base Rate Plus Market Spread
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	0.25%
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.25%
Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion	0.30%
Revolving Credit Facility | Maximum | Lender's Base Rate Plus Market Spread
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.00%
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	2.00%

Shareholders' Equity (Narrative

Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	May 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		$ 54,314		$ 54,314
Total intrinsic value of options exercised				111,031
Aggregate intrinsic value of options exercisable		$ 271,157		$ 271,157
Market value of Company's common stock		$ 62.52		$ 62.52
Weighted average exercise price per share		$ 29.36		$ 29.36
Total options outstanding		14,399		14,399
Total options exercisable		8,178		8,178
Cash dividend declared (in USD per share)	$ 0.30	$ 0.30	$ 0.28	$ 0.30	$ 0.28
Cash dividends declared				$ 47,139	$ 44,264
Common Stock Buyback
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased and retired				2,751
Company purchased, cost				$ 186,900
Remaining stock repurchase authorization amount		$ 183,738		$ 183,738
2014 Plan | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate				50.00%
2014 Plan | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate				50.00%

Shareholders' Equity (Stock-Bas

Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 5,323	$ 6,259	$ 10,518	$ 12,439
Less: Deferred tax benefit	(1,142)	(2,189)	(2,245)	(4,342)
Stock-based compensation expense, net of tax	$ 4,181	$ 4,070	$ 8,273	$ 8,097

Accumulated Other Comprehensi51

Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,476,839
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	(8,151)
Amounts reclassified from accumulated other comprehensive loss	(162)
Net current-period other comprehensive gain	(8,313)
Ending balance	1,590,882
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(19,522)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	(6,826)
Amounts reclassified from accumulated other comprehensive loss	0
Net current-period other comprehensive gain	(6,826)
Ending balance	(26,348)
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(386)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	(1,325)
Amounts reclassified from accumulated other comprehensive loss	(162)
Net current-period other comprehensive gain	(1,487)
Ending balance	(1,873)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(19,908)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Ending balance	$ (28,221)

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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 404,830	$ 372,331	$ 810,428	$ 732,315
Expenses	278,026	259,372	552,366	511,234
Operating profit (loss)	126,804	112,959	258,062	221,081
Private Banks
Segment Reporting Information [Line Items]
Revenues	121,126	116,184	243,290	228,818
Expenses	114,842	112,353	227,044	220,903
Operating profit (loss)	6,284	3,831	16,246	7,915
Investment Advisors
Segment Reporting Information [Line Items]
Revenues	99,890	92,746	199,082	180,984
Expenses	53,052	49,380	105,505	96,919
Operating profit (loss)	46,838	43,366	93,577	84,065
Institutional Investors
Segment Reporting Information [Line Items]
Revenues	83,434	78,068	168,925	155,072
Expenses	40,871	38,668	82,120	77,496
Operating profit (loss)	42,563	39,400	86,805	77,576
Investment Managers
Segment Reporting Information [Line Items]
Revenues	97,566	83,616	194,421	164,103
Expenses	63,321	53,847	126,659	105,912
Operating profit (loss)	34,245	29,769	67,762	58,191
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues	2,814	1,717	4,710	3,338
Expenses	5,940	5,124	11,038	10,004
Operating profit (loss)	$ (3,126)	$ (3,407)	$ (6,328)	$ (6,666)

Business Segment Information (R

Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Total operating profit from segments	$ 126,804	$ 112,959	$ 258,062	$ 221,081
Income from operations	110,290	97,227	226,606	190,744
Operating Segments
Segment Reporting Information [Line Items]
Total operating profit from segments	126,804	112,959	258,062	221,081
Corporate
Segment Reporting Information [Line Items]
Corporate overhead expenses	$ (16,514)	$ (15,732)	$ (31,456)	$ (30,337)

Business Segment Information 54

Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Capital Expenditures	$ 18,786	$ 23,473	$ 37,284	$ 43,539
Depreciation	7,138	6,599	14,260	13,399
Amortization	12,161	12,565	24,015	24,587
Operating Segments
Segment Reporting Information [Line Items]
Capital Expenditures	18,420	23,081	36,610	42,995
Depreciation	6,841	6,417	13,672	13,071
Amortization	12,104	12,515	23,900	24,486
Operating Segments | Private Banks
Segment Reporting Information [Line Items]
Capital Expenditures	9,529	9,479	19,768	22,329
Depreciation	3,323	4,172	6,642	8,582
Amortization	6,747	8,876	13,374	17,339
Operating Segments | Investment Advisors
Segment Reporting Information [Line Items]
Capital Expenditures	4,284	3,698	8,544	8,230
Depreciation	1,105	802	2,210	1,535
Amortization	2,401	2,897	4,758	5,747
Operating Segments | Institutional Investors
Segment Reporting Information [Line Items]
Capital Expenditures	997	1,086	1,964	1,897
Depreciation	452	244	900	471
Amortization	427	426	854	749
Operating Segments | Investment Managers
Segment Reporting Information [Line Items]
Capital Expenditures	3,370	8,665	5,890	10,280
Depreciation	1,806	1,028	3,615	1,944
Amortization	2,345	275	4,690	491
Operating Segments | Investments In New Businesses
Segment Reporting Information [Line Items]
Capital Expenditures	240	153	444	259
Depreciation	155	171	305	539
Amortization	184	41	224	160
Corporate
Segment Reporting Information [Line Items]
Capital Expenditures	366	392	674	544
Depreciation	297	182	588	328
Amortization	$ 57	$ 50	$ 115	$ 101

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 15,167		$ 14,480
Unrecognized tax benefits that would affect effective tax rate	14,546		13,737
Interest and penalties on unrecognized benefits	1,379		$ 1,175
Estimated one-time transition tax	11,544
Payment of transition tax	1,000	$ 0
Estimated one-time transition tax, current	915
Estimated one-time transition tax, noncurrent	9,629
Settlement and Lapse of Statute
Income Tax Contingency [Line Items]
Unrecognized tax benefits within the next twelve months	$ 2,944

Income Taxes (Interest And Pena

Income Taxes (Interest And Penalties) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 15,167	$ 14,480
Interest and penalties on unrecognized benefits	1,379	1,175
Gross uncertain tax positions	16,546	15,655
Amount included in Current liabilities	2,944	3,275
Amount included in Other long-term liabilities	$ 13,602	$ 12,380

Income Taxes (Effective Income

Income Taxes (Effective Income Tax Rate Reconciliation) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Abstract]
Statutory rate	21.00%	35.00%	21.00%	35.00%
State taxes, net of federal tax benefit	2.30%	1.70%	2.30%	1.70%
Foreign tax expense and tax rate differential	(0.10%)	(1.00%)	(0.10%)	(1.00%)
Tax benefit from stock option exercises	(2.00%)	(3.00%)	(6.50%)	(3.60%)
Other, net	(0.10%)	(0.60%)	(0.20%)	(0.50%)
Effective income tax rate	21.10%	32.10%	16.50%	31.60%

Commitments and Contingencies (

Commitments and Contingencies (Details)	Jun. 30, 2018Lawsuit
Loss Contingencies [Line Items]
Number of lawsuits filed	7
Cases with SPTC as Defendant
Loss Contingencies [Line Items]
Number of lawsuits filed	4
Claims for Violations of Louisiana Racketeering Act
Loss Contingencies [Line Items]
Number of lawsuits filed	2
Cases Remaining in Parish Of East Baton Rouge Granted Indefinite Extensions to Respond
Loss Contingencies [Line Items]
Number of lawsuits filed	2
Cases Filed in East Baton Rouge
Loss Contingencies [Line Items]
Number of lawsuits filed	2

Business Acquisition (Details)

Business Acquisition (Details) - USD ($) $ in Thousands	Apr. 02, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Cash paid for acquisition, net of cash acquired			$ 5,794	$ 0
Amortization expense			$ 1,696
Huntington Steele, LLC
Business Acquisition [Line Items]
Contingent liability, recognition period	5 years
Total purchase price	$ 19,014
Cash paid for acquisition, net of cash acquired	5,794
Cash acquired from acquisition	125
Contingent purchase price	$ 13,220
Amortization expense		$ 144

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jul. 03, 2017
Goodwill [Line Items]
Goodwill	$ 65,249	$ 52,990
Amortization expense	$ 1,696
Archway
Goodwill [Line Items]
Goodwill			$ 52,990

Revenues from Contracts with 61

Revenues from Contracts with Customers (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 404,830,000	$ 372,331,000	$ 810,428,000	$ 732,315,000
Deferred contract costs	21,521,000		21,521,000		$ 0
Capitalized contract cost, amount capitalized during period	2,267,000		4,083,000
Amortization of deferred contract costs	619,000		1,201,000
Capitalized contract cost impairment			0
United States
Disaggregation of Revenue [Line Items]
Revenues	335,266,000		671,014,000
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	42,899,000		85,211,000
Canada
Disaggregation of Revenue [Line Items]
Revenues	13,650,000		27,922,000
Ireland
Disaggregation of Revenue [Line Items]
Revenues	12,684,000		25,112,000
Other
Disaggregation of Revenue [Line Items]
Revenues	331,000		1,169,000
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	123,468,000		247,159,000
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	93,840,000		187,795,000
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	88,686,000		176,523,000
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	44,557,000		89,625,000
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	37,823,000		74,790,000
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	6,176,000		13,482,000
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	10,280,000		21,054,000
Private Banks
Disaggregation of Revenue [Line Items]
Revenues	121,126,000	116,184,000	243,290,000	228,818,000
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues	75,669,000		153,802,000
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	29,005,000		56,530,000
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues	11,516,000		23,117,000
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues	4,936,000		9,841,000
Private Banks | Other
Disaggregation of Revenue [Line Items]
Revenues	0		0
Private Banks | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	35,164,000		70,354,000
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	214,000		412,000
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	375,000		757,000
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	43,915,000		88,500,000
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	35,453,000		70,055,000
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	4,195,000		9,614,000
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,810,000		3,598,000
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues	99,890,000	92,746,000	199,082,000	180,984,000
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues	99,890,000		199,082,000
Investment Advisors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investment Advisors | Canada
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investment Advisors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investment Advisors | Other
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investment Advisors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	72,481,000		144,899,000
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	23,389,000		46,153,000
Investment Advisors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investment Advisors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investment Advisors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investment Advisors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investment Advisors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	4,020,000		8,030,000
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues	83,434,000	78,068,000	168,925,000	155,072,000
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues	64,048,000		128,816,000
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	13,894,000		28,681,000
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues	2,134,000		4,805,000
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	3,027,000		5,454,000
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues	331,000		1,169,000
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	15,347,000		31,205,000
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	67,608,000		136,884,000
Institutional Investors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0		0
Institutional Investors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0		0
Institutional Investors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0		0
Institutional Investors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0		0
Institutional Investors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	479,000		836,000
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues	97,566,000	83,616,000	194,421,000	164,103,000
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues	92,845,000		184,604,000
Investment Managers | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investment Managers | Canada
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investment Managers | Ireland
Disaggregation of Revenue [Line Items]
Revenues	4,721,000		9,817,000
Investment Managers | Other
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investment Managers | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	239,000		239,000
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	80,000		163,000
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	88,311,000		175,766,000
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	642,000		1,125,000
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	2,370,000		4,735,000
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	1,981,000		3,868,000
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	3,943,000		8,525,000
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues	2,814,000	$ 1,717,000	4,710,000	$ 3,338,000
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues	2,814,000		4,710,000
Investments In New Businesses | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investments In New Businesses | Canada
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investments In New Businesses | Ireland
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investments In New Businesses | Other
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investments In New Businesses | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	237,000		462,000
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	2,549,000		4,183,000
Investments In New Businesses | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investments In New Businesses | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investments In New Businesses | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investments In New Businesses | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0		0
Investments In New Businesses | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	$ 28,000		$ 65,000