SEI Investments (SEIC) 10-Q 25 Jul 19 2019 Q2 Quarterly report Financial data

Cover

Cover - shares	6 Months Ended
	Jun. 30, 2019	Jul. 18, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Entity File Number	0-10200
Document Transition Report	false
Entity Registrant Name	SEI INVESTMENTS COMPANY
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	23-1707341
Entity Address, Address Line One	1 Freedom Valley Drive
Entity Address, City or Town	Oaks
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19456
City Area Code	610
Local Phone Number	676-1000
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	SEIC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		151,023,802
Entity Central Index Key	0000350894
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 682,266	$ 754,525
Restricted cash	3,520	3,514
Receivables from investment products	52,407	49,869
Receivables, net of allowance for doubtful accounts of $1,101 and $718	335,144	315,336
Securities owned	32,289	30,892
Other current assets	31,915	36,676
Total Current Assets	1,137,541	1,190,812
Property and Equipment, net of accumulated depreciation of $352,293 and $338,206	150,045	145,863
Operating Lease Right-of-Use Assets	42,940
Capitalized Software, net of accumulated amortization of $418,675 and $395,171	305,184	309,500
Investments Available for Sale	106,671	111,901
Investments in Affiliated Funds, at fair value	5,434	4,887
Investment in Unconsolidated Affiliate	50,203	52,342
Goodwill	64,489	64,489
Intangible Assets, net of accumulated amortization of $6,932 and $5,090	29,828	31,670
Deferred Contract Costs	25,132	24,007
Deferred Income Taxes	1,571	2,042
Other Assets, net	33,761	34,155
Total Assets	1,952,799	1,971,668
Current Liabilities:
Accounts payable	5,494	10,920
Accrued liabilities	178,473	279,634
Short-term operating lease liabilities	8,259
Deferred revenue	4,705	5,154
Total Current Liabilities	196,931	295,708
Long-term Income Taxes Payable	803	803
Deferred Income Taxes	55,793	57,795
Long-term Operating Lease Liabilities	39,427
Other Long-term Liabilities	25,344	24,215
Total Liabilities	318,298	378,521
Commitments and Contingencies
Shareholders' Equity:
Common stock, $0.01 par value, 750,000 shares authorized; 150,955 and 153,634 shares issued and outstanding	1,509	1,536
Capital in excess of par value	1,122,068	1,106,641
Retained earnings	541,664	517,970
Accumulated other comprehensive loss, net	(30,740)	(33,000)
Total Shareholders' Equity	1,634,501	1,593,147
Total Liabilities and Shareholders' Equity	$ 1,952,799	$ 1,971,668

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current Assets:
Receivables, allowance for doubtful accounts	$ 1,101	$ 718
Property and Equipment, accumulated depreciation	352,293	338,206
Capitalized software, accumulated amortization	418,675	395,171
Intangible assets, accumulated amortization	$ 6,932	$ 5,090
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	150,955,000	153,634,000
Common stock, shares outstanding	150,955,000	153,634,000

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Revenues	$ 409,586	$ 404,830	$ 810,406	$ 810,428
Expenses:
Subadvisory, distribution and other asset management costs	46,177	45,209	89,982	90,414
Software royalties and other information processing costs	7,393	7,977	15,521	16,695
Compensation, benefits and other personnel	125,999	127,375	256,334	251,652
Stock-based compensation	5,064	5,323	10,102	10,518
Consulting, outsourcing and professional fees	45,330	50,441	95,536	99,148
Data processing and computer related	22,184	21,133	43,176	41,724
Facilities, supplies and other costs	17,100	17,783	35,845	35,396
Amortization	12,781	12,161	25,460	24,015
Depreciation	7,422	7,138	14,753	14,260
Total expenses	289,450	294,540	586,709	583,822
Income from operations	120,136	110,290	223,697	226,606
Net gain (loss) from investments	231	(139)	1,510	(549)
Interest and dividend income	4,313	3,162	8,570	5,664
Interest expense	(166)	(132)	(323)	(389)
Equity in earnings of unconsolidated affiliate	37,832	41,073	75,149	81,680
Income before income taxes	162,346	154,254	308,603	313,012
Income taxes	35,806	32,577	68,082	51,497
Net income	$ 126,540	$ 121,677	$ 240,521	$ 261,515
Basic earnings per common share (in USD per share)	$ 0.83	$ 0.77	$ 1.58	$ 1.66
Shares used to compute basic earnings per share (in shares)	151,863	157,542	152,587	157,488
Diluted earnings per common share (in USD per share)	$ 0.82	$ 0.75	$ 1.54	$ 1.61
Shares used to compute diluted earnings per share (in shares)	155,165	162,225	155,853	162,825
Dividends declared per common share (in USD per share)	$ 0.33	$ 0.30	$ 0.33	$ 0.30
Asset management, administration and distribution fees
Revenues:
Revenues	$ 324,925	$ 316,508	$ 638,869	$ 632,717
Information processing and software servicing fees
Revenues:
Revenues	$ 84,661	$ 88,322	$ 171,537	$ 177,711

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 126,540	$ 121,677	$ 240,521	$ 261,515
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(2,877)	(10,203)	520	(6,826)
Unrealized gain (loss) on investments:
Unrealized gains (losses) during the period, net of income taxes of $(230), $(52), $(470) and $372	765	32	1,562	(1,325)
Less: reclassification adjustment for losses (gains) realized in net income, net of income taxes of $(26), $(31), $(50) and $(46)	92	111	178	(162)
Unrealized gain (loss) on investments:	857	143	1,740	(1,487)
Total other comprehensive (loss) income, net of tax	(2,020)	(10,060)	2,260	(8,313)
Comprehensive income	$ 124,520	$ 111,617	$ 242,781	$ 253,202

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) during the period, income tax expense (benefit)	$ (230)	$ (52)	$ (470)	$ 372
Less: reclassification adjustment for losses realized in net income, income tax benefit	$ (26)	$ (31)	$ (50)	$ (46)

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Capital In Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect upon adoption of ASC 606	$ 14,402			$ 14,402
Beginning balance at Dec. 31, 2017	1,476,839	$ 1,571	$ 1,027,709	467,467	$ (19,908)
Beginning balance, shares at Dec. 31, 2017		157,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	261,515			261,515
Other comprehensive income (loss)	(8,313)				(8,313)
Purchase and retirement of common stock	(186,898)	$ (27)	(13,390)	(173,481)
Purchase and retirement of common stock, shares		(2,751)
Issuance of common stock under employee stock purchase plan	2,151		2,151
Issuance of common stock under the employee stock purchase plan, shares		36
Issuance of common stock upon exercise of stock options	67,807	$ 24	67,783
Issuance of common stock upon exercise of stock options, shares		2,446
Stock-based compensation	10,518		10,518
Dividends declared	(47,139)			(47,139)
Ending balance at Jun. 30, 2018	1,590,882	$ 1,568	1,094,771	522,764	(28,221)
Ending balance, shares at Jun. 30, 2018		156,800
Beginning balance at Mar. 31, 2018	1,613,654	$ 1,580	1,085,312	544,923	(18,161)
Beginning balance, shares at Mar. 31, 2018		157,990
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	121,677			121,677
Other comprehensive income (loss)	(10,060)				(10,060)
Purchase and retirement of common stock	(104,642)	$ (16)	(7,929)	(96,697)
Purchase and retirement of common stock, shares		(1,629)
Issuance of common stock under employee stock purchase plan	1,146		1,146
Issuance of common stock under the employee stock purchase plan, shares		20
Issuance of common stock upon exercise of stock options	10,923	$ 4	10,919
Issuance of common stock upon exercise of stock options, shares		419
Stock-based compensation	5,323		5,323
Dividends declared	(47,139)			(47,139)
Ending balance at Jun. 30, 2018	1,590,882	$ 1,568	1,094,771	522,764	(28,221)
Ending balance, shares at Jun. 30, 2018		156,800
Beginning balance at Dec. 31, 2018	$ 1,593,147	$ 1,536	1,106,641	517,970	(33,000)
Beginning balance, shares at Dec. 31, 2018	153,634	153,634
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 240,521			240,521
Other comprehensive income (loss)	2,260				2,260
Purchase and retirement of common stock	(185,817)	$ (35)	(18,939)	(166,843)
Purchase and retirement of common stock, shares		(3,550)
Issuance of common stock under employee stock purchase plan	2,393		2,393
Issuance of common stock under the employee stock purchase plan, shares		56
Issuance of common stock upon exercise of stock options	21,879	$ 8	21,871
Issuance of common stock upon exercise of stock options, shares		815
Stock-based compensation	10,102		10,102
Dividends declared	(49,984)			(49,984)
Ending balance at Jun. 30, 2019	$ 1,634,501	$ 1,509	1,122,068	541,664	(30,740)
Ending balance, shares at Jun. 30, 2019	150,955	150,955
Beginning balance at Mar. 31, 2019	$ 1,636,550	$ 1,523	1,111,366	552,381	(28,720)
Beginning balance, shares at Mar. 31, 2019		152,276
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	126,540			126,540
Other comprehensive income (loss)	(2,020)				(2,020)
Purchase and retirement of common stock	(97,028)	$ (18)	(9,737)	(87,273)
Purchase and retirement of common stock, shares		(1,825)
Issuance of common stock under employee stock purchase plan	1,071		1,071
Issuance of common stock under the employee stock purchase plan, shares		24
Issuance of common stock upon exercise of stock options	14,308	$ 4	14,304
Issuance of common stock upon exercise of stock options, shares		480
Stock-based compensation	5,064		5,064
Dividends declared	(49,984)			(49,984)
Ending balance at Jun. 30, 2019	$ 1,634,501	$ 1,509	$ 1,122,068	$ 541,664	$ (30,740)
Ending balance, shares at Jun. 30, 2019	150,955	150,955

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	May 29, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (in USD per share)	$ 0.33	$ 0.33	$ 0.30	$ 0.33	$ 0.30

Consolidated Condensed Statemen

Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 240,521	$ 261,515
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1)	(22,876)	1,361
Net cash provided by operating activities	217,645	262,876
Cash flows from investing activities:
Additions to property and equipment	(18,239)	(12,671)
Additions to capitalized software	(19,188)	(24,613)
Purchases of marketable securities	(77,891)	(74,957)
Prepayments and maturities of marketable securities	85,012	64,626
Cash paid for acquisition, net of cash acquired	0	(5,794)
Other investing activities	0	(10,500)
Net cash used in investing activities	(30,306)	(63,909)
Cash flows from financing activities:
Repayments under revolving credit facility	0	(30,000)
Purchase and retirement of common stock	(183,396)	(189,372)
Proceeds from issuance of common stock	24,272	69,958
Payment of dividends	(100,745)	(94,318)
Net cash used in financing activities	(259,869)	(243,732)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	277	(6,036)
Net decrease in cash, cash equivalents and restricted cash	(72,253)	(50,801)
Cash, cash equivalents and restricted cash, beginning of period	758,039	747,752
Cash, cash equivalents and restricted cash, end of period	685,786	696,951
Non-cash operating activities:
Operating lease right-of-use assets and lease liabilities recorded upon adoption of ASC 842	$ 44,169	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
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, 2019 , the results of operations for the three and six months ended June 30, 2019 and 2018 , and cash flows for the six -month periods ended June 30, 2019 and 2018 . 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, 2018 . The Company adopted the requirements of the Accounting Standards Update (ASU) No. 2016-2 Leases (Topic 842) (Accounting Standards Codifications (ASC) 842 (ASC 842)) using the modified retrospective method during the six months ended June 30, 2019 . As a result of the adoption of ASC 842, the Company recorded additional lease assets and net lease liabilities of $44,169 as of January 1, 2019. Upon implementation, the Company elected the package of practical expedients permitted under the transition guidance within the new standard which allowed the Company to carryforward the historical lease identification, classification and initial direct cost. ASC 842 did not materially impact the Company’s consolidated net income or consolidated cash flows (see following caption "Leases"). With the exception of the adoption of ASC 842, there have been no significant changes in significant accounting policies during the six months ended June 30, 2019 as compared to the significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2018 . Variable Interest Entities The Company or its affiliates have created numerous investment products for its clients in various types of legal entity structures. The Company serves as the Manager, Administrator and Distributor for these investment products and may also serve as the Trustee for some of the investment products. The Company receives asset management, distribution, administration and custodial fees for these services. Clients are the equity investors and participate in proportion to their ownership percentage in the net income or loss and net capital gains or losses of the products, and, on liquidation, will participate in proportion to their ownership percentage in the remaining net assets of the products after satisfaction of outstanding liabilities. The Company has concluded that it is not the primary beneficiary of the entities and; therefore, is not required to consolidate any of the pooled investment vehicles for which it receives asset management, distribution, administration and custodial fees under the VIE model. The 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 $6,796 and $6,372 in fees during the three months ended June 30, 2019 and 2018 , respectively. During the six months ended June 30, 2019 and 2018 , the Company waived $14,701 and $13,026 , respectively, in fees. Revenue Recognition Revenue is recognized when the transfer of control of promised goods or services under the terms of a contract with customers are satisfied in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those promised goods or services. Certain portions of the Company’s revenues involve a third party in providing goods or services to its customers. In such circumstances, the Company must determine whether the nature of its promise to the customer is to provide the underlying goods or services (the Company is the principal in the transaction and reports the transaction gross) or to arrange for a third party to provide the underlying goods or services (the entity is the agent in the transaction and reports the transaction net). Cash and Cash Equivalents Cash and cash equivalents includes $272,986 and $315,840 at June 30, 2019 and December 31, 2018 , 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, 2019 and December 31, 2018 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $520 and $514 at June 30, 2019 and December 31, 2018 , 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 $19,188 and $24,613 of software development costs during the six months ended June 30, 2019 and 2018 , respectively. The Company's software development costs primarily relate to significant enhancements to the SEI Wealth Platform SM (SWP). The Company capitalized $18,693 and $23,768 of software development costs for significant enhancements to SWP during the six months ended June 30, 2019 and 2018 , respectively. As of June 30, 2019 , the net book value of SWP was $286,459 . The net book value includes $49,374 of capitalized software development costs in-progress associated with future releases. Capitalized software development costs in-progress associated with future releases of SWP were $42,238 as of December 31, 2018 . SWP has a weighted average remaining life of 8.5 years . Amortization expense for SWP was $20,900 and $19,599 during the six months ended June 30, 2019 and 2018 , respectively. Earnings per Share The calculations of basic and diluted earnings per share for the three and six months ended June 30, 2019 and 2018 are: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Net income $ 126,540 $ 121,677 $ 240,521 $ 261,515 Shares used to compute basic earnings per common share 151,863,000 157,542,000 152,587,000 157,488,000 Dilutive effect of stock options 3,302,000 4,683,000 3,266,000 5,337,000 Shares used to compute diluted earnings per common share 155,165,000 162,225,000 155,853,000 162,825,000 Basic earnings per common share $ 0.83 $ 0.77 $ 1.58 $ 1.66 Diluted earnings per common share $ 0.82 $ 0.75 $ 1.54 $ 1.61 During the three months ended June 30 , 2019 and 2018 , employee stock options to purchase 6,244,000 and 6,221,000 shares of common stock with an average exercise price of $54.79 and $53.33 , respectively, were outstanding but not included in the computation of diluted earnings per common share. During the six months ended June 30, 2019 and 2018 , employee stock options to purchase 6,284,000 and 6,138,000 shares of common stock with an average exercise price of $54.80 and $53.03 , 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 not have been satisfied if the reporting date was the end of the contingency period or the options' exercise price was greater than the average market price of the Company’s common stock and the effect on diluted earnings per common share would have been anti-dilutive. Leases The Company determines if an arrangement is a lease at the inception of the contract. The Company's operating leases are included in Operating lease right-of-use (ROU) assets, Short-term operating lease liabilities, and Long-term operating lease liabilities on the accompanying Consolidated Balance Sheet. The operating lease ROU assets and operating lease liabilities are recognized based on the present value of future minimum lease payments over the lease term at commencement date. As most of the Company’s leases do not provide an implicit interest rate, the Company utilizes an estimated incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. In determining the discount rate used in the present value calculation, the Company has elected to apply the portfolio approach for leases of equipment provided the leases commenced at or around the same time. This election allows the Company to account for leases at a portfolio level provided that the resulting accounting at this level would not differ materially from the accounting at the individual lease level. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company has elected to account for lease and non-lease components separately. Operating lease ROU assets include all contractual lease payments and initial direct costs incurred less any lease incentives. Facility leases generally only contain lease expense and non-component items such as taxes and pass through charges. Only the lease components are included in the ROU assets and lease liabilities. Additionally, the Company has elected not to apply the recognition requirements of ASC 842 to leases which have a lease term of less than one year at the commencement date. The majority of the Company's leases for corporate facilities and equipment contain terms for renewal and extension of the lease agreement. The exercise of lease renewal options is generally at the Company’s sole discretion. The Company includes the lease extensions when it is reasonably certain the Company will exercise the extension. The Company’s lease agreements do not contain any material variable lease payments, material residual value guarantees or any material restrictive covenants. The Company does not currently have any finance leases. See Note 15 for information on related disclosures regarding leases. Reclassifications Certain prior year amounts have been reclassified to conform to current year presentation. New Accounting Pronouncements 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 August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement (ASU 2018-13) which modifies the disclosure requirements on fair value measurements. ASU 2018-13 is effective for the Company beginning in the first quarter of 2020. The Company is currently evaluating the impact of adopting ASU 2018-13 on its consolidated financial statements and related disclosures. In October 2018, the FASB issued ASU 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities (ASU 2018-17). The new standard changes how entities evaluate decision-making fees under the variable interest entity guidance. ASU 2018-17 is effective for the Company beginning in the first quarter of 2020. The Company is currently evaluating the impact of adopting ASU 2018-17 on its consolidated financial statements and related disclosures. In April 2019, the FASB issued ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments (ASU 2019-04), which provided certain improvements to ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01) and ASU 2016-13. As the Company adopted ASU 2016-01 on January 1, 2018, the improvements in ASU 2019-04 are effective in the first quarter of 2020. Early adoption is permitted. The Company expects to adopt ASU 2016-13 in the first quarter of 2020, as described above, and the improvements in ASU 2019-04 will be adopted concurrently. The Company is currently evaluating the impact of adopting ASU 2019-04 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 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 : 2019 2018 Net income $ 240,521 $ 261,515 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 14,753 14,260 Amortization 25,460 24,015 Equity in earnings of unconsolidated affiliate (75,149 ) (81,680 ) Distributions received from unconsolidated affiliate 77,288 89,362 Stock-based compensation 10,102 10,518 Provision for losses on receivables 383 (90 ) Deferred income tax expense (2,050 ) 4,893 Net (gain) loss from investments (1,510 ) 549 Change in long-term income taxes payable — (1,000 ) Change in other long-term liabilities 1,129 1,222 Change in other assets 249 (4,713 ) Contract costs capitalized, net of amortization (1,125 ) (2,880 ) Other 122 (326 ) Change in current assets and liabilities (Increase) decrease in Receivables from investment products (2,538 ) 3,280 Receivables (20,192 ) (31,835 ) Other current assets 3,708 (5,090 ) (Decrease) increase in Accounts payable (5,426 ) 2,251 Accrued liabilities (47,631 ) (22,121 ) Deferred revenue (449 ) 746 Total adjustments (22,876 ) 1,361 Net cash provided by operating activities $ 217,645 $ 262,876

Investment In Unconsolidated Af

Investment In Unconsolidated Affiliate	6 Months Ended
	Jun. 30, 2019
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, 2019 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, 2019 , the Company’s total investment in LSV was $50,203 . The Company receives partnership distributions from LSV on a quarterly basis. The Company received partnership distributions from LSV of $77,288 and $89,362 in the six months ended June 30 , 2019 and 2018 , 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 $37,832 and $41,073 during the three months ended June 30 , 2019 and 2018 , respectively. During the six months ended June 30, 2019 and 2018 , the Company’s proportionate share in the earnings of LSV was $75,149 and $81,680 , respectively. These tables contain condensed financial information of LSV: Condensed Statement of Operations Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Revenues $ 123,017 $ 132,111 $ 243,932 $ 263,829 Net income 97,271 105,605 193,219 210,011 Condensed Balance Sheets June 30, 2019 December 31, 2018 Current assets $ 147,554 $ 138,083 Non-current assets 4,777 1,165 Total assets $ 152,331 $ 139,248 Current liabilities $ 61,823 $ 47,874 Non-current liabilities 4,881 — Partners’ capital 85,627 91,374 Total liabilities and partners’ capital $ 152,331 $ 139,248

Composition of Certain Financia

Composition of Certain Financial Statement Captions	6 Months Ended
	Jun. 30, 2019
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, 2019 December 31, 2018 Trade receivables $ 77,063 $ 76,362 Fees earned, not billed 242,712 226,001 Other receivables 16,470 13,691 336,245 316,054 Less: Allowance for doubtful accounts (1,101 ) (718 ) $ 335,144 $ 315,336 Fees earned, not billed represents receivables from contracts with customers earned but unbilled and results from timing differences between services provided and contractual billing schedules. These billing schedules generally provide for fees to be billed on a quarterly basis. In addition, certain fees earned from investment operations services are calculated based on assets under administration that have an extended valuation process. Billings to these clients occur once the asset valuation processes are completed. Receivables from investment products on the accompanying Consolidated Balance Sheets primarily represent fees receivable for distribution, investment advisory, and administration services to various regulated investment companies and other investment products sponsored by SEI. Property and Equipment Property and Equipment on the accompanying Consolidated Balance Sheets consists of: June 30, 2019 December 31, 2018 Buildings $ 162,449 $ 160,796 Equipment 130,486 126,954 Land 10,772 10,772 Purchased software 140,887 139,245 Furniture and fixtures 18,429 18,103 Leasehold improvements 20,024 18,959 Construction in progress 19,291 9,240 502,338 484,069 Less: Accumulated depreciation (352,293 ) (338,206 ) Property and Equipment, net $ 150,045 $ 145,863 The Company recognized $14,753 and $14,260 in depreciation expense related to property and equipment for the six months ended June 30 , 2019 and 2018 , respectively. Deferred Contract Costs Deferred contract costs, which primarily consist of deferred sales commissions, were $25,132 and $24,007 as of June 30, 2019 and December 31, 2018 , respectively. The Company deferred expenses related to contract costs of $1,950 and $2,267 during the three months ended June 30, 2019 and 2018 , respectively. During the six months ended June 30, 2019 and 2018 , the Company deferred expenses related to contract costs of $3,076 and $4,083 , respectively. Amortization expense related to deferred contract costs were $1,951 and $1,201 during the six months ended June 30, 2019 and 2018 , respectively. There was no impairment loss in relation to deferred contract costs during the six months ended June 30, 2019 . Accrued Liabilities Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: June 30, 2019 December 31, 2018 Accrued employee compensation $ 55,188 $ 97,603 Accrued consulting, outsourcing and professional fees 30,155 31,000 Accrued sub-advisory, distribution and other asset management fees 46,611 42,583 Accrued dividend payable — 50,761 Other accrued liabilities 46,519 57,687 Total accrued liabilities $ 178,473 $ 279,634

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2019
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 , 2019 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2018 . The Company had no Level 3 financial assets at June 30, 2019 or December 31, 2018 that were required to be measured at fair value on a recurring basis. The Company's Level 3 financial liabilities at June 30, 2019 and December 31, 2018 consist entirely of the estimated contingent consideration resulting from an acquisition (See Note 12 ). The fair value of the contingent consideration was determined using a Monte-Carlo simulation model. Key assumptions for the Monte-Carlo simulation model include expected revenues, expected volatility, risk-free rate and correlation coefficient. There were no transfers of financial assets between levels within the fair value hierarchy during the six months ended June 30 , 2019 . 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, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 11,342 $ 11,342 $ — Fixed-income available-for-sale securities 95,329 — 95,329 Fixed-income securities owned 32,289 — 32,289 Investment funds sponsored by LSV (1) 5,434 $ 144,394 $ 11,342 $ 127,618 Fair Value Measurements at the End of the Reporting Period Using Assets December 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 10,218 $ 10,218 $ — Fixed-income available-for-sale securities 101,683 — 101,683 Fixed-income securities owned 30,892 — 30,892 Investment funds sponsored by LSV (1) 4,887 $ 147,680 $ 10,218 $ 132,575 (1) The fair value amounts presented in the tables above are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the accompanying Consolidated Balance Sheets (See Note 5

Marketable Securities

Marketable Securities	6 Months Ended
	Jun. 30, 2019
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, 2019 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,464 $ 108 $ (341 ) $ 7,231 Equities and other mutual funds 3,477 634 — 4,111 Debt securities 94,905 424 — 95,329 $ 105,846 $ 1,166 $ (341 ) $ 106,671 At December 31, 2018 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,446 $ — $ (788 ) $ 6,658 Equities and other mutual funds 3,434 126 — 3,560 Debt securities 103,518 — (1,835 ) 101,683 $ 114,398 $ 126 $ (2,623 ) $ 111,901 Net unrealized gains at June 30, 2019 of the Company's available-for-sale debt securities were $327 (net of income tax expense of $97 ). Net unrealized losses at December 31, 2018 of the Company's available-for-sale debt securities were $1,413 (net of income tax benefit of $422 ). These net unrealized gains and losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets. There were gross realized gains of $1,004 and gross realized losses of $1,310 during the six months ended June 30 , 2018 . Gross realized gains and losses from available-for-sale securities during the six months ended June 30 , 2019 were immaterial. Gains and losses from available-for-sale securities, including amounts reclassified from accumulated comprehensive loss, are reflected in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations. Investments in Affiliated Funds The Company has an investment in funds sponsored by LSV. The Company records this investment on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these funds are recognized in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations. The investment primarily consists of U.S. dollar denominated funds that invest primarily in securities of Canadian, Australian and Japanese companies as well as various other global securities. The underlying securities held by the funds are translated into U.S. dollars within the funds. The funds had a fair value of $5,434 and $4,887 at June 30, 2019 and December 31, 2018 , respectively. The Company recognized gains of $95 and $205 during the three months ended June 30, 2019 and 2018 , respectively, from the change in fair value of the funds. The Company recognized gains of $547 and losses of $295 during the six months ended June 30, 2019 and 2018 , respectively, from the change in fair value of the funds. Securities Owned The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings. The securities had a fair value of $32,289 and $30,892 at June 30, 2019 and December 31, 2018 , respectively. There were no material net gains or losses related to the securities during the three and six months ended June 30, 2019 and 2018 .

Line of Credit

Line of Credit	6 Months Ended
	Jun. 30, 2019
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 Company may issue up to $15,000 in letters of credit under the terms of the Credit Facility. The Company pays a periodic commission fee of 1.25 percent plus a fronting fee of 0.175 percent of the aggregate face amount of the outstanding letters of credit issued under the Credit Facility. 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. As of June 30, 2019 , the Company had outstanding letters of credit of $11,713 under the Credit Facility. These letters of credit were issued primarily for the expansion of the Company's headquarters and are scheduled to expire during the remainder of 2019. The amount of the Credit Facility that is available for general corporate purposes as of June 30, 2019 was $288,287 . The Company was in compliance with all covenants of the Credit Facility during the six months ended June 30, 2019

Shareholders' Equity

Shareholders' Equity	6 Months Ended
	Jun. 30, 2019
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 and thereafter include a service condition which requires a minimum two or four year waiting period from the grant date along with the attainment of the applicable financial vesting target. Earnings per share targets exclude the impact of stock-based compensation and are established at time of grant. 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, 2019 and 2018 , respectively, as follows: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Stock-based compensation expense $ 5,064 $ 5,323 $ 10,102 $ 10,518 Less: Deferred tax benefit (971 ) (1,142 ) (1,917 ) (2,245 ) Stock-based compensation expense, net of tax $ 4,093 $ 4,181 $ 8,185 $ 8,273 As of June 30, 2019 , there was approximately $55,538 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 , 2019 was $21,816 . The total options exercisable as of June 30, 2019 had an intrinsic value of $192,595 . 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, 2019 and the weighted average exercise price of the options. The market value of the Company’s common stock as of June 30, 2019 was $56.10 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of June 30, 2019 was $33.55 . Total options that were outstanding as of June 30, 2019 were 14,784,000 . Total options that were exercisable as of June 30, 2019 were 8,540,000 . 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 3,550,000 shares at a total cost of $185,817 during the six months ended June 30 , 2019 , 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, 2019 , the Company had approximately $30,061 of authorization remaining for the purchase of common stock under the program. On July 23, 2019 , the Company's Board of Directors approved an increase in the stock repurchase program by an additional $250,000 , increasing the available authorization to approximately $280,061 . 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 29, 2019 , the Board of Directors declared a cash dividend of $0.33 per share on the Company's common stock, which was paid on June 20, 2019 , to shareholders of record on June 12, 2019 . Cash dividends declared during the six months ended June 30, 2019 and 2018 were $49,984 and $47,139

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2019
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, 2019 $ (31,587 ) $ (1,413 ) $ (33,000 ) Other comprehensive income before reclassifications 520 1,562 2,082 Amounts reclassified from accumulated other comprehensive loss — 178 178 Net current-period other comprehensive income 520 1,740 2,260 Balance, June 30, 2019 $ (31,067 ) $ 327 $ (30,740 )

Business Segment Information

Business Segment Information	6 Months Ended
	Jun. 30, 2019
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, traditional and non-traditional investment managers worldwide and family offices in the United States; and Investments in New Businesses – focuses on providing investment management solutions to ultra-high-net-worth families residing in the United States; developing 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, 2019 and 2018 . 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, 2018 . The following tables highlight certain financial information about each of the Company’s business segments for the three months ended June 30, 2019 and 2018 : Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended June 30, 2019 Revenues $ 116,092 $ 100,122 $ 81,109 $ 109,202 $ 3,061 $ 409,586 Expenses 107,790 50,558 39,361 68,371 6,797 272,877 Operating profit (loss) $ 8,302 $ 49,564 $ 41,748 $ 40,831 $ (3,736 ) $ 136,709 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 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 , 2019 and 2018 is as follows: 2019 2018 Total operating profit from segments $ 136,709 $ 126,804 Corporate overhead expenses (16,573 ) (16,514 ) Income from operations $ 120,136 $ 110,290 The following tables provide additional information for the three months ended June 30 , 2019 and 2018 pertaining to our business segments: Capital Expenditures (1) Depreciation 2019 2018 2019 2018 Private Banks $ 8,761 $ 9,529 $ 3,585 $ 3,323 Investment Advisors 4,558 4,284 1,165 1,105 Institutional Investors 1,049 997 414 452 Investment Managers 4,875 3,370 1,820 1,806 Investments in New Businesses 344 240 110 155 Total from business segments $ 19,587 $ 18,420 $ 7,094 $ 6,841 Corporate overhead 586 366 328 297 $ 20,173 $ 18,786 $ 7,422 $ 7,138 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2019 2018 Private Banks $ 7,217 $ 6,747 Investment Advisors 2,550 2,401 Institutional Investors 427 427 Investment Managers 2,346 2,345 Investments in New Businesses 185 184 Total from business segments $ 12,725 $ 12,104 Corporate overhead 56 57 $ 12,781 $ 12,161 The following tables highlight certain financial information about each of the Company’s business segments for the six months ended June 30, 2019 and 2018 : Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Six Months Ended June 30, 2019 Revenues $ 234,351 $ 194,883 $ 161,222 $ 213,851 $ 6,099 $ 810,406 Expenses 218,752 103,060 78,115 137,437 12,737 550,101 Operating profit (loss) $ 15,599 $ 91,823 $ 83,107 $ 76,414 $ (6,638 ) $ 260,305 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 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, 2019 and 2018 is as follows: 2019 2018 Total operating profit from segments $ 260,305 $ 258,062 Corporate overhead expenses (36,608 ) (31,456 ) Income from operations $ 223,697 $ 226,606 The following tables provide additional information for the six months ended June 30, 2019 and 2018 pertaining to our business segments: Capital Expenditures (1) Depreciation 2019 2018 2019 2018 Private Banks $ 17,222 $ 19,768 $ 7,134 $ 6,642 Investment Advisors 8,505 8,544 2,344 2,210 Institutional Investors 1,920 1,964 819 900 Investment Managers 8,224 5,890 3,591 3,615 Investments in New Businesses 585 444 201 305 Total from business segments $ 36,456 $ 36,610 $ 14,089 $ 13,672 Corporate Overhead 971 674 664 588 $ 37,427 $ 37,284 $ 14,753 $ 14,260 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2019 2018 Private Banks $ 14,358 $ 13,374 Investment Advisors 5,073 4,758 Institutional Investors 860 854 Investment Managers 4,685 4,690 Investments in New Businesses 370 224 Total from business segments $ 25,346 $ 23,900 Corporate Overhead 114 115 $ 25,460 $ 24,015

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The gross liability for unrecognized tax benefits at June 30, 2019 and December 31, 2018 was $15,479 and $14,367 , respectively, exclusive of interest and penalties, of which $15,126 and $13,774 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, 2019 and December 31, 2018 , the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $1,677 and $1,289 , respectively. June 30, 2019 December 31, 2018 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 15,479 $ 14,367 Interest and penalties on unrecognized benefits 1,677 1,289 Total gross uncertain tax positions $ 17,156 $ 15,656 Amount included in Current liabilities $ 2,964 $ 3,131 Amount included in Other long-term liabilities 14,192 12,525 $ 17,156 $ 15,656 The Company's effective income tax rate for the three and six months ended June 30, 2019 and 2018 differs from the federal income tax statutory rate due to the following: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Statutory rate 21.0 % 21.0 % 21.0 % 21.0 % State taxes, net of federal tax benefit 2.6 2.3 2.6 2.3 Foreign tax expense and tax rate differential (0.1 ) (0.1 ) (0.1 ) (0.1 ) Tax benefit from stock option exercises (1.1 ) (2.0 ) (1.1 ) (6.5 ) Other, net (0.3 ) (0.1 ) (0.3 ) (0.2 ) 22.1 % 21.1 % 22.1 % 16.5 % The increase in the Company's effective tax rate for the three and six months ended June 30, 2019 was primarily due to reduced tax benefits related to the lower volume of stock option exercises as compared to the three and six months ended June 30, 2018. 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 2015 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2014 . The Company estimates it will recognize $2,964 of gross unrecognized tax benefits. This amount is expected to be paid within one year or to be removed at the expiration of the statute of limitations and resolution of income tax audits and is netted against the current payable account. These unrecognized tax benefits are related to tax positions taken on certain federal, state, and foreign tax returns. However, the timing of the resolution of income tax examinations is highly uncertain, and the amounts ultimately paid, if any, upon resolution of the issues raised by the taxing authorities may differ materially from the amounts accrued for each year. While it is reasonably possible that some issues under examination could be resolved in the next twelve months, based upon the current facts and circumstances, the Company cannot reasonably estimate the timing of such resolution or the total range of potential changes as it relates to the current unrecognized tax benefits that are recorded as part of the Company’s financial statements.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Stanford Trust Company Litigation 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 remaining 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 (“ Ahders Complaint”), alleging claims essentially the same as those in Lillie . In January 2017, the Judicial Panel on Multidistrict Litigation transferred the Ahders proceeding to the Northern District of Texas and the Stanford MDL. During February 2017, SEI filed its response to the Ahders 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. In both cases, as a result of the proceedings in the Northern District of Texas, only the plaintiffs’ secondary liability claims under Section 714(B) of the Louisiana Securities Law remain. Limited discovery and motions practice have occurred, including SEI and SPTC’s filing of a dispositive summary judgment motion in the Lillie proceeding. On January 31, 2019, the Judicial Panel on Multidistrict Litigation remanded the Lillie and Ahders proceedings to the Middle District of Louisiana. On July 9, 2019, the District Court issued an order granting SEI’s Summary Judgment Motion to dismiss the remaining Section 714(B) claim in the Lillie proceeding and denying Plaintiffs’ Motion for Continuance of SEI and SPTC’s Motion for Summary Judgment pursuant to Rule 56(d). On July 16, 2019, SEI and SPTC filed a Motion for Summary Judgment pursuant to Rule 56(d) in the Ahders proceeding to have the remaining Section 714(B) claim dismissed. On July 17, 2019, Plaintiffs filed a Motion for Reconsideration and/or New Trial as to the July 9, 2019 Ruling and Order (ECF 146) by the Honorable Brian A. Jackson denying a continuance of SEI’s Motion for Summary Judgment pursuant to Rule 56(d). SEI and SPTC expect to file an answer to Plaintiffs’ Motion for Reconsideration on or before the deadline for responding of August 8, 2019. Another case, 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. Two additional cases remain in the Parish of East Baton Rouge. Plaintiffs filed petitions in 2010 and have granted SEI and SPTC indefinite extensions to respond. No material activity has taken place since. In 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 subject matter jurisdiction under the federal Securities Litigation Uniform Standards Act (SLUSA). The matters were removed to the United States District Court for the Northern District of Texas and consolidated. The court then 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 matters were remanded to state court and no material activity has taken place since that date. While the outcome of this litigation remains uncertain, SEI and SPTC believe that they have valid defenses to plaintiffs' claims and intend to defend the lawsuits vigorously. Because of uncertainty in the make-up of the Lillie class, the specific theories of liability that may survive a motion for summary judgment or other dispositive motion, the relative lack of discovery regarding damages, causation, mitigation and other aspects that may ultimately bear upon loss, the Company is not reasonably able to provide an estimate of loss, if any, with respect to the foregoing lawsuits. SEI Capital Accumulation Plan Litigation On September 28, 2018, a class action complaint was filed in the United States District Court for the Eastern District of Pennsylvania by Gordon Stevens, individually and as the representative of similarly situated persons, and on behalf of the SEI Capital Accumulation Plan (the “Plan”) naming the Company and its affiliated and/or related entities SEI Investments Management Corporation, SEI Capital Accumulation Plan Design Committee, SEI Capital Accumulation Plan Investment Committee, SEI Capital Accumulation Plan Administration Committee, and John Does 1-30 as defendants (the “Stevens Complaint”). The Stevens Compliant seeks unspecified damages for defendants’ breach of fiduciary duties under ERISA with respect to selecting and monitoring the Plan’s investment options and by retaining affiliated investment products in the Plan. On May 14, 2019, Plaintiff and SEI filed notice with the court of their collective intent to settle the Stevens Litigation. As of the date of this report, the terms of the settlement have not yet been finalized, and will be subject to court review and approval. Although SEI has agreed to settle this matter in the very early stages of the litigation in order to avoid the high cost of protracted class-action litigation and internal distractions such cases bring, SEI believes its defenses against the plaintiff’s allegations remain valid. While the outcome of this litigation remains uncertain, the defendants believe that they have valid defenses to plaintiffs’ claims and intend to defend the allegations contained in the Stevens Complaint vigorously. Because of uncertainty in the make-up of the purported class named in the Stevens Complaint, the specific theories of liability that may survive a motion for summary judgment or other dispositive motion, the lack of specificity or discovery regarding damages, causation, mitigation and other aspects that may ultimately bear upon loss, the Company is not reasonably able to provide an estimate of loss, if any, with respect to the matters set forth in the Stevens Complaint. Other Matters The Company is also a party to various other actions and claims arising in the normal course of business that the Company does not believe are material. The Company believes that the ultimate resolution of these matters will not have a material adverse effect on the Company's financial position or the manner in which the Company conducts its business. Currently, the Company does not believe the amount of losses associated with these matters can be estimated. While the Company does not believe that the amount of such losses will, when liquidated or estimable, be material to its financial position, the assumptions may be incorrect and any such loss could have a material adverse effect on the Company's results of operations or the manner in which the Company conducts its business in the period(s) during which the underlying matters are resolved.

Business Acquisition

Business Acquisition	6 Months Ended
	Jun. 30, 2019
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. The total purchase price for Huntington Steele was $17,914 , which includes $5,794 in cash consideration, net of $125 in cash acquired, and a contingent purchase price of $12,120 . The contingent purchase price consists of amounts payable to the sellers upon the attainment of specified financial measures determined at various intervals occurring between 2019 and 2023. The Company made a payment of $433 to the sellers during the three months ended June 30, 2019. As of June 30, 2019 , the current portion of the contingent purchase price of $535 is included in Accrued liabilities on the accompanying Balance Sheet. The long-term portion of the contingent consideration of $11,152 is included in Other long-term liabilities on the accompanying Balance Sheet.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2019
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 12 ). The total purchase price was allocated to Huntington Steele’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 identifiable intangible assets was recorded as goodwill. The total amount of goodwill from this transaction amounted to $11,499 and is included on the accompanying Consolidated Balance Sheets. 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. There were no changes to the Company's goodwill during the six months ended June 30, 2019 . The Company recognized $1,842 and $1,696 of amortization expense related to the intangible assets acquired through the acquisitions of Huntington Steele and Archway during the six months ended June 30, 2019 and 2018 , respectively.

Revenues from Contracts with Cu

Revenues from Contracts with Customers	6 Months Ended
	Jun. 30, 2019
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 months ended June 30, 2019 and 2018 : Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total Major Product Lines: For the Three Months Ended June 30, 2019 Investment management fees from pooled investment products $ 33,451 $ 70,087 $ 13,799 $ 184 $ 325 $ 117,846 Investment management fees from investment management agreements 283 25,448 67,076 — 2,713 95,520 Investment operations fees 362 — — 99,932 — 100,294 Investment processing fees - PaaS 43,156 — — — — 43,156 Investment processing fees - SaaS 34,776 — — 2,593 — 37,369 Professional services fees 2,586 — — 1,548 — 4,134 Account fees and other 1,478 4,587 234 4,945 23 11,267 Total revenues $ 116,092 $ 100,122 $ 81,109 $ 109,202 $ 3,061 $ 409,586 Primary Geographic Markets: United States $ 74,889 $ 100,122 $ 63,653 $ 101,794 $ 3,061 $ 343,519 United Kingdom 25,695 — 13,140 — — 38,835 Canada 10,882 — 1,708 — — 12,590 Ireland 4,626 — 2,356 7,408 — 14,390 Other — — 252 — — 252 Total revenues $ 116,092 $ 100,122 $ 81,109 $ 109,202 $ 3,061 $ 409,586 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 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 six months ended June 30, 2019 and 2018 : Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total Major Product Lines: For the Six Months Ended June 30, 2019 Investment management fees from pooled investment products $ 66,424 $ 136,710 $ 27,460 $ 389 $ 634 $ 231,617 Investment management fees from investment management agreements 985 49,286 133,247 — 5,411 188,929 Investment operations fees 738 — — 194,799 — 195,537 Investment processing fees - PaaS 87,067 — — — — 87,067 Investment processing fees - SaaS 69,484 — — 5,142 — 74,626 Professional services fees 6,363 — — 2,965 — 9,328 Account fees and other 3,290 8,887 515 10,556 54 23,302 Total revenues $ 234,351 $ 194,883 $ 161,222 $ 213,851 $ 6,099 $ 810,406 Primary Geographic Markets: United States $ 152,343 $ 194,883 $ 125,978 $ 199,852 $ 6,099 $ 679,155 United Kingdom 51,045 — 26,606 — — 77,651 Canada 21,542 — 3,435 — — 24,977 Ireland 9,421 — 4,667 13,999 — 28,087 Other — — 536 — — 536 Total revenues $ 234,351 $ 194,883 $ 161,222 $ 213,851 $ 6,099 $ 810,406 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 fees - Revenues associated with the business services migration for investment processing clients of the Private Banks segment and investment operations clients of the Investment Managers segment. In addition, Professional services include other services such as business transformation consulting. Typically, fees are stated as a contractual fixed fee. The client is billed directly and fees are collected according to the terms of the agreement. 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. The Company does not disclose the value of unsatisfied performance obligations as the majority of its contracts relate to: 1) contracts with an original term of one year or less; 2) contracts for which the Company recognizes revenue at the amount to which it has the right to invoice for services performed; and 3) contracts that are based on the value of assets under management or administration.

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Leases The Company has operating leases for corporate facilities and equipment. The Company's expense related to leases during the three and six months ended June 30, 2019 was $2,529 and $5,097 , respectively, and is included in Facilities, supplies and other costs on the accompanying Consolidated Statement of Operations. The Company's future minimum lease payments under non-cancelable leases as of June 30, 2019 are as follows: 2019 (excluding the six months ended June 30, 2019) $ 2,328 2020 8,929 2021 7,618 2022 7,326 2023 7,326 Thereafter 17,530 Total future minimum lease payments 51,057 Less: Imputed interest (3,371 ) Total $ 47,686 The following table provides supplemental Consolidated Balance Sheet information related to the Company's leases: June 30, 2019 Short-term operating lease liabilities $ 8,259 Long-term operating lease liabilities 39,427 Total operating lease liabilities $ 47,686 Weighted average remaining lease term 6.8 years Weighted average discount rate 2.78 % The following table provides supplemental cash flow information related to the Company's leases: For the Six Months Ended June 30, 2019 Cash paid for amounts included in the measurement of lease liabilities $ 5,405 Right-of-use assets obtained in exchange for lease obligations 2,810 As of June 30, 2019 , the Company has additional operating lease exposure that have not yet commenced of $1,291 . These operating leases will have a commencement date occurring in the remainder of 2019 and have a lease term of five years .

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policy)	6 Months Ended
	Jun. 30, 2019
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, 2019 , the results of operations for the three and six months ended June 30, 2019 and 2018 , and cash flows for the six -month periods ended June 30, 2019 and 2018 . 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, 2018 . The Company adopted the requirements of the Accounting Standards Update (ASU) No. 2016-2 Leases (Topic 842) (Accounting Standards Codifications (ASC) 842 (ASC 842)) using the modified retrospective method during the six months ended June 30, 2019 . As a result of the adoption of ASC 842, the Company recorded additional lease assets and net lease liabilities of $44,169 as of January 1, 2019. Upon implementation, the Company elected the package of practical expedients permitted under the transition guidance within the new standard which allowed the Company to carryforward the historical lease identification, classification and initial direct cost. ASC 842 did not materially impact the Company’s consolidated net income or consolidated cash flows (see following caption "Leases"). With the exception of the adoption of ASC 842, there have been no significant changes in significant accounting policies during the six months ended June 30, 2019 as compared to the significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2018 .
Variable Interest Entities	Variable Interest Entities The Company or its affiliates have created numerous investment products for its clients in various types of legal entity structures. The Company serves as the Manager, Administrator and Distributor for these investment products and may also serve as the Trustee for some of the investment products. The Company receives asset management, distribution, administration and custodial fees for these services. Clients are the equity investors and participate in proportion to their ownership percentage in the net income or loss and net capital gains or losses of the products, and, on liquidation, will participate in proportion to their ownership percentage in the remaining net assets of the products after satisfaction of outstanding liabilities. The Company has concluded that it is not the primary beneficiary of the entities and; therefore, is not required to consolidate any of the pooled investment vehicles for which it receives asset management, distribution, administration and custodial fees under the VIE model. The 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.
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).
Cash and Cash Equivalents	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. Cash and Cash Equivalents Cash and cash equivalents includes $272,986 and $315,840 at June 30, 2019 and December 31, 2018 , 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 Restricted cash includes $3,000 at June 30, 2019 and December 31, 2018 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $520 and $514 at June 30, 2019 and December 31, 2018 , 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.
Leases	Leases The Company determines if an arrangement is a lease at the inception of the contract. The Company's operating leases are included in Operating lease right-of-use (ROU) assets, Short-term operating lease liabilities, and Long-term operating lease liabilities on the accompanying Consolidated Balance Sheet. The operating lease ROU assets and operating lease liabilities are recognized based on the present value of future minimum lease payments over the lease term at commencement date. As most of the Company’s leases do not provide an implicit interest rate, the Company utilizes an estimated incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. In determining the discount rate used in the present value calculation, the Company has elected to apply the portfolio approach for leases of equipment provided the leases commenced at or around the same time. This election allows the Company to account for leases at a portfolio level provided that the resulting accounting at this level would not differ materially from the accounting at the individual lease level. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company has elected to account for lease and non-lease components separately. Operating lease ROU assets include all contractual lease payments and initial direct costs incurred less any lease incentives. Facility leases generally only contain lease expense and non-component items such as taxes and pass through charges. Only the lease components are included in the ROU assets and lease liabilities. Additionally, the Company has elected not to apply the recognition requirements of ASC 842 to leases which have a lease term of less than one year at the commencement date. The majority of the Company's leases for corporate facilities and equipment contain terms for renewal and extension of the lease agreement. The exercise of lease renewal options is generally at the Company’s sole discretion. The Company includes the lease extensions when it is reasonably certain the Company will exercise the extension. The Company’s lease agreements do not contain any material variable lease payments, material residual value guarantees or any material restrictive covenants. The Company does not currently have any finance leases.
Reclassification	Reclassifications Certain prior year amounts have been reclassified to conform to current year presentation.
New Accounting Pronouncements	New Accounting Pronouncements 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 August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement (ASU 2018-13) which modifies the disclosure requirements on fair value measurements. ASU 2018-13 is effective for the Company beginning in the first quarter of 2020. The Company is currently evaluating the impact of adopting ASU 2018-13 on its consolidated financial statements and related disclosures. In October 2018, the FASB issued ASU 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities (ASU 2018-17). The new standard changes how entities evaluate decision-making fees under the variable interest entity guidance. ASU 2018-17 is effective for the Company beginning in the first quarter of 2020. The Company is currently evaluating the impact of adopting ASU 2018-17 on its consolidated financial statements and related disclosures. In April 2019, the FASB issued ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments (ASU 2019-04), which provided certain improvements to ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01) and ASU 2016-13. As the Company adopted ASU 2016-01 on January 1, 2018, the improvements in ASU 2019-04 are effective in the first quarter of 2020. Early adoption is permitted. The Company expects to adopt ASU 2016-13 in the first quarter of 2020, as described above, and the improvements in ASU 2019-04 will be adopted concurrently. The Company is currently evaluating the impact of adopting ASU 2019-04 on its consolidated financial statements and related disclosures.
Equity Method Investments	The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations.
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 , 2019 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2018 . The Company had no Level 3 financial assets at June 30, 2019 or December 31, 2018
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 gains and losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets.
Securities Owned	The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency 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 Accoun_3

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 and 2018 are: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Net income $ 126,540 $ 121,677 $ 240,521 $ 261,515 Shares used to compute basic earnings per common share 151,863,000 157,542,000 152,587,000 157,488,000 Dilutive effect of stock options 3,302,000 4,683,000 3,266,000 5,337,000 Shares used to compute diluted earnings per common share 155,165,000 162,225,000 155,853,000 162,825,000 Basic earnings per common share $ 0.83 $ 0.77 $ 1.58 $ 1.66 Diluted earnings per common share $ 0.82 $ 0.75 $ 1.54 $ 1.61
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 : 2019 2018 Net income $ 240,521 $ 261,515 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 14,753 14,260 Amortization 25,460 24,015 Equity in earnings of unconsolidated affiliate (75,149 ) (81,680 ) Distributions received from unconsolidated affiliate 77,288 89,362 Stock-based compensation 10,102 10,518 Provision for losses on receivables 383 (90 ) Deferred income tax expense (2,050 ) 4,893 Net (gain) loss from investments (1,510 ) 549 Change in long-term income taxes payable — (1,000 ) Change in other long-term liabilities 1,129 1,222 Change in other assets 249 (4,713 ) Contract costs capitalized, net of amortization (1,125 ) (2,880 ) Other 122 (326 ) Change in current assets and liabilities (Increase) decrease in Receivables from investment products (2,538 ) 3,280 Receivables (20,192 ) (31,835 ) Other current assets 3,708 (5,090 ) (Decrease) increase in Accounts payable (5,426 ) 2,251 Accrued liabilities (47,631 ) (22,121 ) Deferred revenue (449 ) 746 Total adjustments (22,876 ) 1,361 Net cash provided by operating activities $ 217,645 $ 262,876

Investment In Unconsolidated _2

Investment In Unconsolidated Affiliate (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 2018 2019 2018 Revenues $ 123,017 $ 132,111 $ 243,932 $ 263,829 Net income 97,271 105,605 193,219 210,011 Condensed Balance Sheets June 30, 2019 December 31, 2018 Current assets $ 147,554 $ 138,083 Non-current assets 4,777 1,165 Total assets $ 152,331 $ 139,248 Current liabilities $ 61,823 $ 47,874 Non-current liabilities 4,881 — Partners’ capital 85,627 91,374 Total liabilities and partners’ capital $ 152,331 $ 139,248

Composition of Certain Financ_2

Composition of Certain Financial Statement Captions (Tables)	6 Months Ended
	Jun. 30, 2019
Items Included in Consolidated Statement of Financial Condition [Abstract]
Receivables	Receivables on the accompanying Consolidated Balance Sheets consist of: June 30, 2019 December 31, 2018 Trade receivables $ 77,063 $ 76,362 Fees earned, not billed 242,712 226,001 Other receivables 16,470 13,691 336,245 316,054 Less: Allowance for doubtful accounts (1,101 ) (718 ) $ 335,144 $ 315,336
Property And Equipment	Property and Equipment on the accompanying Consolidated Balance Sheets consists of: June 30, 2019 December 31, 2018 Buildings $ 162,449 $ 160,796 Equipment 130,486 126,954 Land 10,772 10,772 Purchased software 140,887 139,245 Furniture and fixtures 18,429 18,103 Leasehold improvements 20,024 18,959 Construction in progress 19,291 9,240 502,338 484,069 Less: Accumulated depreciation (352,293 ) (338,206 ) Property and Equipment, net $ 150,045 $ 145,863
Accrued Liabilities	Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: June 30, 2019 December 31, 2018 Accrued employee compensation $ 55,188 $ 97,603 Accrued consulting, outsourcing and professional fees 30,155 31,000 Accrued sub-advisory, distribution and other asset management fees 46,611 42,583 Accrued dividend payable — 50,761 Other accrued liabilities 46,519 57,687 Total accrued liabilities $ 178,473 $ 279,634

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 11,342 $ 11,342 $ — Fixed-income available-for-sale securities 95,329 — 95,329 Fixed-income securities owned 32,289 — 32,289 Investment funds sponsored by LSV (1) 5,434 $ 144,394 $ 11,342 $ 127,618 Fair Value Measurements at the End of the Reporting Period Using Assets December 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 10,218 $ 10,218 $ — Fixed-income available-for-sale securities 101,683 — 101,683 Fixed-income securities owned 30,892 — 30,892 Investment funds sponsored by LSV (1) 4,887 $ 147,680 $ 10,218 $ 132,575 (1) The fair value amounts presented in the tables above are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the accompanying Consolidated Balance Sheets (See Note 5

Marketable Securities (Tables)

Marketable Securities (Tables)	6 Months Ended
	Jun. 30, 2019
Marketable Securities [Abstract]
Investments Available For Sale	Investments available for sale classified as non-current assets consist of: At June 30, 2019 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,464 $ 108 $ (341 ) $ 7,231 Equities and other mutual funds 3,477 634 — 4,111 Debt securities 94,905 424 — 95,329 $ 105,846 $ 1,166 $ (341 ) $ 106,671 At December 31, 2018 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,446 $ — $ (788 ) $ 6,658 Equities and other mutual funds 3,434 126 — 3,560 Debt securities 103,518 — (1,835 ) 101,683 $ 114,398 $ 126 $ (2,623 ) $ 111,901

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 and 2018 , respectively, as follows: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Stock-based compensation expense $ 5,064 $ 5,323 $ 10,102 $ 10,518 Less: Deferred tax benefit (971 ) (1,142 ) (1,917 ) (2,245 ) Stock-based compensation expense, net of tax $ 4,093 $ 4,181 $ 8,185 $ 8,273

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 $ (31,587 ) $ (1,413 ) $ (33,000 ) Other comprehensive income before reclassifications 520 1,562 2,082 Amounts reclassified from accumulated other comprehensive loss — 178 178 Net current-period other comprehensive income 520 1,740 2,260 Balance, June 30, 2019 $ (31,067 ) $ 327 $ (30,740 )

Business Segment Information (T

Business Segment Information (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 and 2018 : Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended June 30, 2019 Revenues $ 116,092 $ 100,122 $ 81,109 $ 109,202 $ 3,061 $ 409,586 Expenses 107,790 50,558 39,361 68,371 6,797 272,877 Operating profit (loss) $ 8,302 $ 49,564 $ 41,748 $ 40,831 $ (3,736 ) $ 136,709 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
Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations	A reconciliation of the total operating profit reported for the business segments to income from operations in the Consolidated Statements of Operations for the three months ended June 30 , 2019 and 2018 is as follows: 2019 2018 Total operating profit from segments $ 136,709 $ 126,804 Corporate overhead expenses (16,573 ) (16,514 ) Income from operations $ 120,136 $ 110,290
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated	The following tables provide additional information for the three months ended June 30 , 2019 and 2018 pertaining to our business segments: Capital Expenditures (1) Depreciation 2019 2018 2019 2018 Private Banks $ 8,761 $ 9,529 $ 3,585 $ 3,323 Investment Advisors 4,558 4,284 1,165 1,105 Institutional Investors 1,049 997 414 452 Investment Managers 4,875 3,370 1,820 1,806 Investments in New Businesses 344 240 110 155 Total from business segments $ 19,587 $ 18,420 $ 7,094 $ 6,841 Corporate overhead 586 366 328 297 $ 20,173 $ 18,786 $ 7,422 $ 7,138 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2019 2018 Private Banks $ 7,217 $ 6,747 Investment Advisors 2,550 2,401 Institutional Investors 427 427 Investment Managers 2,346 2,345 Investments in New Businesses 185 184 Total from business segments $ 12,725 $ 12,104 Corporate overhead 56 57 $ 12,781 $ 12,161 The following tables highlight certain financial information about each of the Company’s business segments for the six months ended June 30, 2019 and 2018 : Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Six Months Ended June 30, 2019 Revenues $ 234,351 $ 194,883 $ 161,222 $ 213,851 $ 6,099 $ 810,406 Expenses 218,752 103,060 78,115 137,437 12,737 550,101 Operating profit (loss) $ 15,599 $ 91,823 $ 83,107 $ 76,414 $ (6,638 ) $ 260,305 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 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, 2019 and 2018 is as follows: 2019 2018 Total operating profit from segments $ 260,305 $ 258,062 Corporate overhead expenses (36,608 ) (31,456 ) Income from operations $ 223,697 $ 226,606 The following tables provide additional information for the six months ended June 30, 2019 and 2018 pertaining to our business segments: Capital Expenditures (1) Depreciation 2019 2018 2019 2018 Private Banks $ 17,222 $ 19,768 $ 7,134 $ 6,642 Investment Advisors 8,505 8,544 2,344 2,210 Institutional Investors 1,920 1,964 819 900 Investment Managers 8,224 5,890 3,591 3,615 Investments in New Businesses 585 444 201 305 Total from business segments $ 36,456 $ 36,610 $ 14,089 $ 13,672 Corporate Overhead 971 674 664 588 $ 37,427 $ 37,284 $ 14,753 $ 14,260 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2019 2018 Private Banks $ 14,358 $ 13,374 Investment Advisors 5,073 4,758 Institutional Investors 860 854 Investment Managers 4,685 4,690 Investments in New Businesses 370 224 Total from business segments $ 25,346 $ 23,900 Corporate Overhead 114 115 $ 25,460 $ 24,015

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Schedule Of Interest And Penalties	June 30, 2019 December 31, 2018 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 15,479 $ 14,367 Interest and penalties on unrecognized benefits 1,677 1,289 Total gross uncertain tax positions $ 17,156 $ 15,656 Amount included in Current liabilities $ 2,964 $ 3,131 Amount included in Other long-term liabilities 14,192 12,525 $ 17,156 $ 15,656
Schedule of Effective Income Tax Rate Reconciliation	The Company's effective income tax rate for the three and six months ended June 30, 2019 and 2018 differs from the federal income tax statutory rate due to the following: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Statutory rate 21.0 % 21.0 % 21.0 % 21.0 % State taxes, net of federal tax benefit 2.6 2.3 2.6 2.3 Foreign tax expense and tax rate differential (0.1 ) (0.1 ) (0.1 ) (0.1 ) Tax benefit from stock option exercises (1.1 ) (2.0 ) (1.1 ) (6.5 ) Other, net (0.3 ) (0.1 ) (0.3 ) (0.2 ) 22.1 % 21.1 % 22.1 % 16.5 %

Revenues from Contracts with _2

Revenues from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2019
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 months ended June 30, 2019 and 2018 : Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total Major Product Lines: For the Three Months Ended June 30, 2019 Investment management fees from pooled investment products $ 33,451 $ 70,087 $ 13,799 $ 184 $ 325 $ 117,846 Investment management fees from investment management agreements 283 25,448 67,076 — 2,713 95,520 Investment operations fees 362 — — 99,932 — 100,294 Investment processing fees - PaaS 43,156 — — — — 43,156 Investment processing fees - SaaS 34,776 — — 2,593 — 37,369 Professional services fees 2,586 — — 1,548 — 4,134 Account fees and other 1,478 4,587 234 4,945 23 11,267 Total revenues $ 116,092 $ 100,122 $ 81,109 $ 109,202 $ 3,061 $ 409,586 Primary Geographic Markets: United States $ 74,889 $ 100,122 $ 63,653 $ 101,794 $ 3,061 $ 343,519 United Kingdom 25,695 — 13,140 — — 38,835 Canada 10,882 — 1,708 — — 12,590 Ireland 4,626 — 2,356 7,408 — 14,390 Other — — 252 — — 252 Total revenues $ 116,092 $ 100,122 $ 81,109 $ 109,202 $ 3,061 $ 409,586 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 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 six months ended June 30, 2019 and 2018 : Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total Major Product Lines: For the Six Months Ended June 30, 2019 Investment management fees from pooled investment products $ 66,424 $ 136,710 $ 27,460 $ 389 $ 634 $ 231,617 Investment management fees from investment management agreements 985 49,286 133,247 — 5,411 188,929 Investment operations fees 738 — — 194,799 — 195,537 Investment processing fees - PaaS 87,067 — — — — 87,067 Investment processing fees - SaaS 69,484 — — 5,142 — 74,626 Professional services fees 6,363 — — 2,965 — 9,328 Account fees and other 3,290 8,887 515 10,556 54 23,302 Total revenues $ 234,351 $ 194,883 $ 161,222 $ 213,851 $ 6,099 $ 810,406 Primary Geographic Markets: United States $ 152,343 $ 194,883 $ 125,978 $ 199,852 $ 6,099 $ 679,155 United Kingdom 51,045 — 26,606 — — 77,651 Canada 21,542 — 3,435 — — 24,977 Ireland 9,421 — 4,667 13,999 — 28,087 Other — — 536 — — 536 Total revenues $ 234,351 $ 194,883 $ 161,222 $ 213,851 $ 6,099 $ 810,406 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

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Schedule of Future Minimum Lease Payments	The Company's future minimum lease payments under non-cancelable leases as of June 30, 2019 are as follows: 2019 (excluding the six months ended June 30, 2019) $ 2,328 2020 8,929 2021 7,618 2022 7,326 2023 7,326 Thereafter 17,530 Total future minimum lease payments 51,057 Less: Imputed interest (3,371 ) Total $ 47,686
Supplemental Consolidated Balance Sheet Information Related to Operating Leases	The following table provides supplemental Consolidated Balance Sheet information related to the Company's leases: June 30, 2019 Short-term operating lease liabilities $ 8,259 Long-term operating lease liabilities 39,427 Total operating lease liabilities $ 47,686 Weighted average remaining lease term 6.8 years Weighted average discount rate 2.78 %
Supplemental Cash Flow Information Related to Operating Leases	The following table provides supplemental cash flow information related to the Company's leases: For the Six Months Ended June 30, 2019 Cash paid for amounts included in the measurement of lease liabilities $ 5,405 Right-of-use assets obtained in exchange for lease obligations 2,810

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Summary of Significant Accounting Policies [Line Items]
Operating Lease Right-of-Use Assets	$ 42,940		$ 42,940
Lease liabilities	47,686		47,686
Cash and cash equivalents invested in SEI-sponsored money market funds	682,266		682,266			$ 754,525
Restricted cash	3,520		3,520			3,514
Capitalized software development costs			19,188	$ 24,613
Net book value of capitalized software	$ 305,184		$ 305,184			309,500
Anti-dilutive employee stock options (in shares)	6,244	6,221	6,284	6,138
Anti-dilutive employee stock options (in USD per share)	$ 54.79	$ 53.33	$ 54.80	$ 53.03
SEI Wealth Platform
Summary of Significant Accounting Policies [Line Items]
Capitalized software development costs			$ 18,693	$ 23,768
Net book value of capitalized software	$ 286,459		286,459
Capitalized software in progress	49,374		49,374			42,238
Amortization expense of capitalized software			$ 20,900	19,599
SEI Wealth Platform | Weighted Average
Summary of Significant Accounting Policies [Line Items]
Weighted Average Estimated Useful Life			8 years 6 months
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	272,986		$ 272,986			315,840
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	520		520			$ 514
SEI-Sponsored Open-Ended Money Market Mutual Funds
Summary of Significant Accounting Policies [Line Items]
Fees waived according to expense limitation agreements	$ 6,796	$ 6,372	$ 14,701	$ 13,026
Accounting Standards Update 2016-02
Summary of Significant Accounting Policies [Line Items]
Operating Lease Right-of-Use Assets					$ 44,169
Lease liabilities					$ 44,169

Summary of Significant Accoun_5

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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Net income	$ 126,540	$ 121,677	$ 240,521	$ 261,515
Shares used to compute basic earnings per common share (in shares)	151,863	157,542	152,587	157,488
Dilutive effect of stock options (in shares)	3,302	4,683	3,266	5,337
Shares used to compute diluted earnings per common share (in shares)	155,165	162,225	155,853	162,825
Basic earnings per common share (in USD per share)	$ 0.83	$ 0.77	$ 1.58	$ 1.66
Diluted earnings per common share (in USD per share)	$ 0.82	$ 0.75	$ 1.54	$ 1.61

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Net income	$ 126,540	$ 121,677	$ 240,521	$ 261,515
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	7,422	7,138	14,753	14,260
Amortization	12,781	12,161	25,460	24,015
Equity in earnings of unconsolidated affiliate	(37,832)	(41,073)	(75,149)	(81,680)
Distributions received from unconsolidated affiliate			77,288	89,362
Stock-based compensation	$ 5,064	$ 5,323	10,102	10,518
Provision for losses on receivables			383	(90)
Deferred income tax expense			(2,050)	4,893
Net (gain) loss from investments			(1,510)	549
Change in long-term income taxes payable			0	(1,000)
Change in other long-term liabilities			1,129	1,222
Change in other assets			249	(4,713)
Contract costs capitalized, net of amortization			(1,125)	(2,880)
Other			122	(326)
(Increase) decrease in
Receivables from investment products			(2,538)	3,280
Receivables			(20,192)	(31,835)
Other current assets			3,708	(5,090)
(Decrease) increase in
Accounts payable			(5,426)	2,251
Accrued liabilities			(47,631)	(22,121)
Deferred revenue			(449)	746
Total adjustments			(22,876)	1,361
Net cash provided by operating activities			$ 217,645	$ 262,876

Investment In Unconsolidated _3

Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investments in and Advances to Affiliates [Line Items]
Distributions received from unconsolidated affiliate			$ 77,288	$ 89,362
Company's share in the earnings of equity method investee	$ 37,832	$ 41,073	$ 75,149	81,680
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	$ 50,203		$ 50,203
Distributions received from unconsolidated affiliate			77,288	89,362
Company's share in the earnings of equity method investee	$ 37,832	$ 41,073	$ 75,149	$ 81,680

Investment In Unconsolidated _4

Investment In Unconsolidated Affiliate (Statement of Operations) (Details) - LSV Asset Management - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schedule of Equity Method Investments [Line Items]
Revenues	$ 123,017	$ 132,111	$ 243,932	$ 263,829
Net income	$ 97,271	$ 105,605	$ 193,219	$ 210,011

Investment in Unconsolidated _5

Investment in Unconsolidated Affiliate (Balance Sheets) (Details) - LSV Asset Management - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Current assets	$ 147,554	$ 138,083
Non-current assets	4,777	1,165
Total assets	152,331	139,248
Current liabilities	61,823	47,874
Non-current liabilities	4,881	0
Partners’ capital	85,627	91,374
Total liabilities and partners’ capital	$ 152,331	$ 139,248

Composition of Certain Financ_3

Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Items Included in Consolidated Statement of Financial Condition [Abstract]
Trade receivables	$ 77,063	$ 76,362
Fees earned, not billed	242,712	226,001
Other receivables	16,470	13,691
Receivables, Gross, Current	336,245	316,054
Less: Allowance for doubtful accounts	(1,101)	(718)
Receivables, net	$ 335,144	$ 315,336

Composition of Certain Financ_4

Composition of Certain Financial Statement Captions (Property And Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Property and Equipment [Line Items]
Property and Equipment, gross	$ 502,338		$ 502,338		$ 484,069
Less: Accumulated depreciation	(352,293)		(352,293)		(338,206)
Property and Equipment, net	150,045		150,045		145,863
Depreciation expense	7,422	$ 7,138	14,753	$ 14,260
Buildings
Property and Equipment [Line Items]
Property and Equipment, gross	162,449		162,449		160,796
Equipment
Property and Equipment [Line Items]
Property and Equipment, gross	130,486		130,486		126,954
Land
Property and Equipment [Line Items]
Property and Equipment, gross	10,772		10,772		10,772
Purchased software
Property and Equipment [Line Items]
Property and Equipment, gross	140,887		140,887		139,245
Furniture and fixtures
Property and Equipment [Line Items]
Property and Equipment, gross	18,429		18,429		18,103
Leasehold improvements
Property and Equipment [Line Items]
Property and Equipment, gross	20,024		20,024		18,959
Construction in progress
Property and Equipment [Line Items]
Property and Equipment, gross	$ 19,291		$ 19,291		$ 9,240

Composition of Certain Financ_5

Composition of Certain Financial Statement Captions (Deferred Contract Costs) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Items Included in Consolidated Statement of Financial Condition [Abstract]
Deferred contract costs	$ 25,132,000		$ 25,132,000		$ 24,007,000
Capitalized contract cost, amount capitalized during period	$ 1,950,000	$ 2,267,000	3,076,000	$ 4,083,000
Amortization of deferred contract costs			1,951,000	$ 1,201,000
Capitalized contract cost impairment			$ 0

Composition of Certain Financ_6

Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 55,188	$ 97,603
Accrued consulting, outsourcing and professional fees	30,155	31,000
Accrued sub-advisory, distribution and other asset management fees	46,611	42,583
Accrued dividend payable	0	50,761
Other accrued liabilities	46,519	57,687
Total accrued liabilities	$ 178,473	$ 279,634

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	$ 5,434	$ 4,887
Fixed-income securities owned	32,289	30,892
Assets, fair value	144,394	147,680
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-income securities owned	0	0
Assets, fair value	11,342	10,218
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-income securities owned	32,289	30,892
Assets, fair value	127,618	132,575
SEI Sponsored Mutual Funds, Equities and Other Mutual Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	11,342	10,218
SEI Sponsored Mutual Funds, Equities and Other Mutual Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	11,342	10,218
SEI Sponsored Mutual Funds, Equities and Other Mutual Funds | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	0	0
Fixed income securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	95,329	101,683
Fixed income securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	0	0
Fixed income securities | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	95,329	101,683
Investment funds sponsored by LSV
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	$ 5,434	$ 4,887

Marketable Securities (Investme

Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Equity securities, FV-NI	$ 5,434	$ 4,887
Investments Available for sale, Cost Amount	105,846	114,398
Investments Available for sale, Gross Unrealized Gains	1,166	126
Investments Available for sale, Gross Unrealized (Losses)	(341)	(2,623)
Investments Available for sale, Fair Value	106,671	111,901
SEI-sponsored mutual funds
Debt Securities, Available-for-sale [Line Items]
Equity securities, FV-NI, Cost Amount	7,464	7,446
Equity securities, FV-NI, Gross Unrealized Gains	108	0
Equity securities, FV-NI, Gross Unrealized (Losses)	(341)	(788)
Equity securities, FV-NI	7,231	6,658
Equities and other mutual funds
Debt Securities, Available-for-sale [Line Items]
Equity securities, FV-NI, Cost Amount	3,477	3,434
Equity securities, FV-NI, Gross Unrealized Gains	634	126
Equity securities, FV-NI, Gross Unrealized (Losses)	0	0
Equity securities, FV-NI	4,111	3,560
Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, Cost Amount	94,905	103,518
Debt securities, Gross Unrealized Gains	424	0
Debt securities, Gross Unrealized (Losses)	0	(1,835)
Debt securities, Fair Value	$ 95,329	$ 101,683

Marketable Securities (Narrativ

Marketable Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Schedule of Investments [Line Items]
Net unrealized gains (losses) of available-for-sale debt securities	$ 327		$ 327		$ (1,413)
Unrealized gains (losses) during the period, income tax expense (benefit)	97		97		(422)
Available-for-sale securities, gross realized gains				$ 1,004
Available-for-sale securities, gross realized losses				1,310
Investments in Affiliated Funds, at fair value	5,434		5,434		4,887
Securities owned	32,289		32,289		30,892
Investment Funds Sponsored by LSV
Schedule of Investments [Line Items]
Investments in Affiliated Funds, at fair value	5,434		5,434		$ 4,887
Gains (losses) from investment funds sponsored by LSV	$ 95	$ 205	$ 547	$ (295)

Line of Credit (Details)

Line of Credit (Details) - USD ($)	Jun. 13, 2016	Jun. 30, 2019
Line of Credit Facility [Line Items]
Letters of credit outstanding amount		$ 11,713,000
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 remaining borrowing capacity		288,287,000
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%
Letter of Credit
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity		$ 15,000,000
Credit facility, commitment fee percentage		1.25%
Credit facility, fronting fee percentage		0.175%

Shareholders' Equity (Narrative

Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands	May 29, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jul. 23, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		$ 55,538,000		$ 55,538,000
Total intrinsic value of options exercised				21,816,000
Aggregate intrinsic value of options exercisable		$ 192,595,000		$ 192,595,000
Market value of Company's common stock (in USD per share)		$ 56.10		$ 56.10
Weighted average exercise price per share (in USD per share)		$ 33.55		$ 33.55
Total options outstanding (in shares)		14,784		14,784
Total options exercisable (in shares)		8,540		8,540
Dividends declared per common share (in USD per share)	$ 0.33	$ 0.33	$ 0.30	$ 0.33	$ 0.30
Cash dividends declared		$ 49,984,000	$ 47,139,000	$ 49,984,000	$ 47,139,000
Common Stock Buyback
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased and retired (in shares)				3,550
Company purchased, cost				$ 185,817,000
Remaining stock repurchase authorization amount		$ 30,061,000		$ 30,061,000
2014 Plan | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate				50.00%
2014 Plan | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate				50.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award waiting period				2 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award waiting period				4 years
Subsequent Event | Common Stock Buyback
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining stock repurchase authorization amount						$ 280,061,000
Stock repurchase program, authorized amount						$ 250,000,000

Shareholders' Equity (Stock-Bas

Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 5,064	$ 5,323	$ 10,102	$ 10,518
Less: Deferred tax benefit	(971)	(1,142)	(1,917)	(2,245)
Stock-based compensation expense, net of tax	$ 4,093	$ 4,181	$ 8,185	$ 8,273

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,593,147
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income before reclassifications	2,082
Amounts reclassified from accumulated other comprehensive loss	178
Net current-period other comprehensive income	2,260
Ending balance	1,634,501
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(31,587)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income before reclassifications	520
Amounts reclassified from accumulated other comprehensive loss	0
Net current-period other comprehensive income	520
Ending balance	(31,067)
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,413)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income before reclassifications	1,562
Amounts reclassified from accumulated other comprehensive loss	178
Net current-period other comprehensive income	1,740
Ending balance	327
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(33,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Ending balance	$ (30,740)

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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 409,586	$ 404,830	$ 810,406	$ 810,428
Expenses	272,877	278,026	550,101	552,366
Operating profit (loss)	136,709	126,804	260,305	258,062
Private Banks
Segment Reporting Information [Line Items]
Revenues	116,092	121,126	234,351	243,290
Expenses	107,790	114,842	218,752	227,044
Operating profit (loss)	8,302	6,284	15,599	16,246
Investment Advisors
Segment Reporting Information [Line Items]
Revenues	100,122	99,890	194,883	199,082
Expenses	50,558	53,052	103,060	105,505
Operating profit (loss)	49,564	46,838	91,823	93,577
Institutional Investors
Segment Reporting Information [Line Items]
Revenues	81,109	83,434	161,222	168,925
Expenses	39,361	40,871	78,115	82,120
Operating profit (loss)	41,748	42,563	83,107	86,805
Investment Managers
Segment Reporting Information [Line Items]
Revenues	109,202	97,566	213,851	194,421
Expenses	68,371	63,321	137,437	126,659
Operating profit (loss)	40,831	34,245	76,414	67,762
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues	3,061	2,814	6,099	4,710
Expenses	6,797	5,940	12,737	11,038
Operating profit (loss)	$ (3,736)	$ (3,126)	$ (6,638)	$ (6,328)

Business Segment Information (R

Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Total operating profit from segments	$ 136,709	$ 126,804	$ 260,305	$ 258,062
Income from operations	120,136	110,290	223,697	226,606
Operating Segments
Segment Reporting Information [Line Items]
Total operating profit from segments	136,709	126,804	260,305	258,062
Corporate
Segment Reporting Information [Line Items]
Corporate overhead expenses	$ (16,573)	$ (16,514)	$ (36,608)	$ (31,456)

Business Segment Information _2

Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Capital Expenditures	$ 20,173	$ 18,786	$ 37,427	$ 37,284
Depreciation	7,422	7,138	14,753	14,260
Amortization	12,781	12,161	25,460	24,015
Operating Segments
Segment Reporting Information [Line Items]
Capital Expenditures	19,587	18,420	36,456	36,610
Depreciation	7,094	6,841	14,089	13,672
Amortization	12,725	12,104	25,346	23,900
Operating Segments | Private Banks
Segment Reporting Information [Line Items]
Capital Expenditures	8,761	9,529	17,222	19,768
Depreciation	3,585	3,323	7,134	6,642
Amortization	7,217	6,747	14,358	13,374
Operating Segments | Investment Advisors
Segment Reporting Information [Line Items]
Capital Expenditures	4,558	4,284	8,505	8,544
Depreciation	1,165	1,105	2,344	2,210
Amortization	2,550	2,401	5,073	4,758
Operating Segments | Institutional Investors
Segment Reporting Information [Line Items]
Capital Expenditures	1,049	997	1,920	1,964
Depreciation	414	452	819	900
Amortization	427	427	860	854
Operating Segments | Investment Managers
Segment Reporting Information [Line Items]
Capital Expenditures	4,875	3,370	8,224	5,890
Depreciation	1,820	1,806	3,591	3,615
Amortization	2,346	2,345	4,685	4,690
Operating Segments | Investments In New Businesses
Segment Reporting Information [Line Items]
Capital Expenditures	344	240	585	444
Depreciation	110	155	201	305
Amortization	185	184	370	224
Corporate
Segment Reporting Information [Line Items]
Capital Expenditures	586	366	971	674
Depreciation	328	297	664	588
Amortization	$ 56	$ 57	$ 114	$ 115

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 15,479	$ 14,367
Unrecognized tax benefits that would affect effective tax rate	15,126	13,774
Interest and penalties on unrecognized benefits	1,677	$ 1,289
Settlement and Lapse of Statute
Income Tax Contingency [Line Items]
Unrecognized tax benefits within the next twelve months	$ 2,964

Income Taxes (Interest And Pena

Income Taxes (Interest And Penalties) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 15,479	$ 14,367
Interest and penalties on unrecognized benefits	1,677	1,289
Total gross uncertain tax positions	17,156	15,656
Amount included in Current liabilities	2,964	3,131
Amount included in Other long-term liabilities	$ 14,192	$ 12,525

Income Taxes (Effective Income

Income Taxes (Effective Income Tax Rate Reconciliation) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Abstract]
Statutory rate	21.00%	21.00%	21.00%	21.00%
State taxes, net of federal tax benefit	2.60%	2.30%	2.60%	2.30%
Foreign tax expense and tax rate differential	(0.10%)	(0.10%)	(0.10%)	(0.10%)
Tax benefit from stock option exercises	(1.10%)	(2.00%)	(1.10%)	(6.50%)
Other, net	(0.30%)	(0.10%)	(0.30%)	(0.20%)
Effective income tax rate	22.10%	21.10%	22.10%	16.50%

Commitments and Contingencies (

Commitments and Contingencies (Details)	Jun. 30, 2019Lawsuit
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, 2019	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Net cash consideration			$ 0	$ 5,794
Huntington Steele, LLC
Business Acquisition [Line Items]
Total purchase price	$ 17,914
Net cash consideration	5,794
Cash acquired from acquisition	125
Contingent purchase price	$ 12,120
Payment for contingent purchase price		$ 433
Accrued liabilities | Huntington Steele, LLC
Business Acquisition [Line Items]
Contingent purchase price, current		535	535
Other long-term liabilities | Huntington Steele, LLC
Business Acquisition [Line Items]
Contingent purchase price, noncurrent		$ 11,152	$ 11,152

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Apr. 02, 2018	Jul. 03, 2017
Goodwill [Line Items]
Goodwill	$ 64,489,000		$ 64,489,000
Goodwill change during period	0
Amortization expense	$ 1,842,000	$ 1,696,000
Huntington Steele, LLC
Goodwill [Line Items]
Goodwill				$ 11,499,000
Archway
Goodwill [Line Items]
Goodwill					$ 52,990,000

Revenues from Contracts with _3

Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 409,586	$ 404,830	$ 810,406	$ 810,428
United States
Disaggregation of Revenue [Line Items]
Revenues	343,519	335,266	679,155	671,014
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	38,835	42,899	77,651	85,211
Canada
Disaggregation of Revenue [Line Items]
Revenues	12,590	13,650	24,977	27,922
Ireland
Disaggregation of Revenue [Line Items]
Revenues	14,390	12,684	28,087	25,112
Other
Disaggregation of Revenue [Line Items]
Revenues	252	331	536	1,169
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	117,846	123,468	231,617	247,159
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	95,520	93,840	188,929	187,795
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	100,294	88,686	195,537	176,523
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	43,156	44,557	87,067	89,625
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	37,369	37,823	74,626	74,790
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	4,134	6,176	9,328	13,482
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	11,267	10,280	23,302	21,054
Private Banks
Disaggregation of Revenue [Line Items]
Revenues	116,092	121,126	234,351	243,290
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues	74,889	75,669	152,343	153,802
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	25,695	29,005	51,045	56,530
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues	10,882	11,516	21,542	23,117
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues	4,626	4,936	9,421	9,841
Private Banks | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Private Banks | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	33,451	35,164	66,424	70,354
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	283	214	985	412
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	362	375	738	757
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	43,156	43,915	87,067	88,500
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	34,776	35,453	69,484	70,055
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	2,586	4,195	6,363	9,614
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,478	1,810	3,290	3,598
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues	100,122	99,890	194,883	199,082
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues	100,122	99,890	194,883	199,082
Investment Advisors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Advisors | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Advisors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Advisors | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Advisors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	70,087	72,481	136,710	144,899
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	25,448	23,389	49,286	46,153
Investment Advisors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Advisors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Advisors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Advisors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Advisors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	4,587	4,020	8,887	8,030
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues	81,109	83,434	161,222	168,925
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues	63,653	64,048	125,978	128,816
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	13,140	13,894	26,606	28,681
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues	1,708	2,134	3,435	4,805
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	2,356	3,027	4,667	5,454
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues	252	331	536	1,169
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	13,799	15,347	27,460	31,205
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	67,076	67,608	133,247	136,884
Institutional Investors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Institutional Investors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Institutional Investors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Institutional Investors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Institutional Investors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	234	479	515	836
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues	109,202	97,566	213,851	194,421
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues	101,794	92,845	199,852	184,604
Investment Managers | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Managers | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Managers | Ireland
Disaggregation of Revenue [Line Items]
Revenues	7,408	4,721	13,999	9,817
Investment Managers | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Managers | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	184	239	389	239
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	0	80	0	163
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	99,932	88,311	194,799	175,766
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	642	0	1,125
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	2,593	2,370	5,142	4,735
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	1,548	1,981	2,965	3,868
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	4,945	3,943	10,556	8,525
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues	3,061	2,814	6,099	4,710
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues	3,061	2,814	6,099	4,710
Investments In New Businesses | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses | Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	325	237	634	462
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	2,713	2,549	5,411	4,183
Investments In New Businesses | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investments In New Businesses | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	$ 23	$ 28	$ 54	$ 65

Leases (Narrative) (Details)

Leases (Narrative) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)
Leases [Abstract]
Operating leases expense	$ 2,529	$ 5,097
Operating ease exposure that have not yet commenced	$ 1,291	$ 1,291
Operating ease exposure that have not yet commenced, lease term	5 years	5 years

Leases (Schedule of Future Mini

Leases (Schedule of Future Minimum Lease Payments) (Details) $ in Thousands	Jun. 30, 2019USD ($)
Leases [Abstract]
2019 (excluding the three months ended March 31, 2019)	$ 2,328
2020	8,929
2021	7,618
2022	7,326
2023	7,326
Thereafter	17,530
Total future minimum lease payments	51,057
Less: Imputed interest	(3,371)
Lease liabilities	$ 47,686

Leases (Supplemental Consolidat

Leases (Supplemental Consolidated Balance Sheet Information Related to Operating Leases) (Details) $ in Thousands	Jun. 30, 2019USD ($)
Leases [Abstract]
Short-term operating lease liabilities	$ 8,259
Long-term Operating Lease Liabilities	39,427
Total operating lease liabilities	$ 47,686
Weighted average remaining lease term	6 years 9 months 18 days
Weighted average discount rate	2.78%

Leases (Supplemental Cash Flow

Leases (Supplemental Cash Flow Information Related to Operating Leases) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities	$ 5,405
Right-of-use assets obtained in exchange for lease obligations	$ 2,810