SEI Investments (SEIC) 10-Q 26 Jul 21 2021 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2021	Jul. 22, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	0-10200
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 Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		141,076,628
Entity Central Index Key	0000350894
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false
Current Fiscal Year End Date	--12-31

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 780,928	$ 784,626
Restricted cash	351	3,101
Receivables from investment products	56,177	55,271
Receivables, net of allowance for doubtful accounts of $3,188 and $1,100	409,568	385,219
Securities owned	26,174	34,064
Other current assets	38,158	38,696
Total Current Assets	1,311,356	1,300,977
Property and Equipment, net of accumulated depreciation of $394,743 and $378,639	184,042	189,052
Operating Lease Right-of-Use Assets	36,871	38,397
Capitalized Software, net of accumulated amortization of $518,514 and $491,739	256,473	270,977
Available for Sale and Equity Securities	130,039	105,419
Investments in Affiliated Funds, at fair value	6,932	6,166
Investment in Unconsolidated Affiliate	47,420	98,433
Goodwill	64,489	64,489
Intangible Assets, net of accumulated amortization of $14,573 and $12,456	33,187	24,304
Deferred Contract Costs	33,352	33,781
Deferred Income Taxes	2,447	2,972
Other Assets, net	33,082	32,289
Total Assets	2,139,690	2,167,256
Current Liabilities:
Accounts payable	9,291	7,766
Accrued liabilities	211,984	299,845
Current portion of long-term operating lease liabilities	10,344	8,579
Deferred revenue	1,280	1,085
Total Current Liabilities	232,899	317,275
Long-term Income Taxes Payable	803	803
Deferred Income Taxes	47,644	55,159
Long-term Operating Lease Liabilities	31,697	34,058
Other Long-term Liabilities	21,041	20,054
Total Liabilities	334,084	427,349
Commitments and Contingencies
Shareholders' Equity:
Common stock, $0.01 par value, 750,000 shares authorized; 141,027 and 143,396 shares issued and outstanding	1,410	1,434
Capital in excess of par value	1,219,487	1,190,001
Retained earnings	599,231	565,270
Accumulated other comprehensive loss, net	(14,522)	(16,798)
Total Shareholders' Equity	1,805,606	1,739,907
Total Liabilities and Shareholders' Equity	$ 2,139,690	$ 2,167,256

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 3,188	$ 1,100
Property and equipment, accumulated depreciation	394,743	378,639
Capitalized Software, accumulated amortization	518,514	491,739
Intangible Assets, accumulated amortization	$ 14,573	$ 12,456
Shareholders' 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	141,027,000	143,396,000
Common stock, shares outstanding	141,027,000	143,396,000

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Revenues	$ 475,651	$ 400,646	$ 931,337	$ 815,408
Expenses:
Subadvisory, distribution and other asset management costs	55,827	44,182	105,991	89,519
Software royalties and other information processing costs	7,471	7,389	13,213	14,836
Compensation, benefits and other personnel	141,779	125,331	279,000	256,812
Stock-based compensation	10,103	7,062	19,855	13,991
Consulting, outsourcing and professional fees	55,449	57,111	109,789	110,401
Data processing and computer related	27,375	24,506	53,096	47,210
Facilities, supplies and other costs	18,479	13,973	35,727	30,769
Amortization	14,723	13,140	29,075	26,217
Depreciation	8,424	7,640	16,733	15,113
Total expenses	339,630	300,334	662,479	604,868
Income from operations	136,021	100,312	268,858	210,540
Net gain (loss) from investments	377	1,903	709	(2,086)
Interest and dividend income	878	1,370	1,823	4,573
Interest expense	(130)	(151)	(253)	(303)
Equity in earnings of unconsolidated affiliate	35,065	28,276	68,415	58,183
Income before income taxes	172,211	131,710	339,552	270,907
Income taxes	38,433	30,644	76,304	60,599
Net income	$ 133,778	$ 101,066	$ 263,248	$ 210,308
Basic earnings per common share (in USD per share)	$ 0.94	$ 0.69	$ 1.85	$ 1.42
Shares used to compute basic earnings per share (in shares)	142,074	147,478	142,638	148,473
Diluted earnings per common share (in USD per share)	$ 0.93	$ 0.68	$ 1.82	$ 1.39
Shares used to compute diluted earnings per share (in shares)	144,212	149,598	144,759	150,983
Dividends declared per common share (in USD per share)	$ 0.37	$ 0.35	$ 0.37	$ 0.35
Asset management, administration and distribution fees
Revenues:
Revenues	$ 382,509	$ 320,577	$ 750,155	$ 652,430
Information processing and software servicing fees
Revenues:
Revenues	$ 93,142	$ 80,069	$ 181,182	$ 162,978

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 133,778	$ 101,066	$ 263,248	$ 210,308
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	994	940	2,679	(12,136)
Unrealized (loss) gain on investments:
Unrealized (losses) gains during the period, net of income taxes of $85, $(33), $245 and $(372)	(292)	113	(835)	1,244
Reclassification adjustment for losses realized in net income, net of income taxes of $(49), $(35), $(123) and $(63)	179	116	432	217
Total other comprehensive income (loss), net of tax	881	1,169	2,276	(10,675)
Comprehensive income	$ 134,659	$ 102,235	$ 265,524	$ 199,633

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Unrealized gains during the period, taxes	$ 85	$ (33)	$ 245	$ (372)
Reclassification adjustment for losses realized in net income, taxes	$ (49)	$ (35)	$ (123)	$ (63)

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
Beginning balance, shares at Dec. 31, 2019		149,745
Beginning balance at Dec. 31, 2019	$ 1,738,778	$ 1,497	$ 1,158,900	$ 601,885	$ (23,504)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	210,308			210,308
Other comprehensive income (loss)	(10,675)				(10,675)
Purchase and retirement of common stock, shares		(4,075)
Purchase and retirement of common stock	(216,902)	$ (40)	(23,060)	(193,802)
Issuance of common stock under employee stock purchase plan, shares		47
Issuance of common stock under employee stock purchase plan	2,248	$ 0	2,248
Issuance of common stock upon exercise of stock options, shares		728
Issuance of common stock upon exercise of stock options	22,339	$ 7	22,332
Stock-based compensation	13,991		13,991
Dividends declared	(51,462)			(51,462)
Ending balance, shares at Jun. 30, 2020		146,445
Ending balance at Jun. 30, 2020	1,708,625	$ 1,464	1,174,411	566,929	(34,179)
Beginning balance, shares at Mar. 31, 2020		147,903
Beginning balance at Mar. 31, 2020	1,734,266	$ 1,479	1,170,649	597,486	(35,348)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	101,066			101,066
Other comprehensive income (loss)	1,169				1,169
Purchase and retirement of common stock, shares		(1,642)
Purchase and retirement of common stock	(89,470)	$ (16)	(9,293)	(80,161)
Issuance of common stock under employee stock purchase plan, shares		26
Issuance of common stock under employee stock purchase plan	1,142		1,142
Issuance of common stock upon exercise of stock options, shares		158
Issuance of common stock upon exercise of stock options	4,852	$ 1	4,851
Stock-based compensation	7,062		7,062
Dividends declared	(51,462)			(51,462)
Ending balance, shares at Jun. 30, 2020		146,445
Ending balance at Jun. 30, 2020	$ 1,708,625	$ 1,464	1,174,411	566,929	(34,179)
Beginning balance, shares at Dec. 31, 2020	143,396	143,396
Beginning balance at Dec. 31, 2020	$ 1,739,907	$ 1,434	1,190,001	565,270	(16,798)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	263,248			263,248
Other comprehensive income (loss)	2,276				2,276
Purchase and retirement of common stock, shares		(3,238)
Purchase and retirement of common stock	(196,158)	$ (32)	(19,228)	(176,898)
Issuance of common stock under employee stock purchase plan, shares		42
Issuance of common stock under employee stock purchase plan	2,105	$ 0	2,105
Issuance of common stock upon exercise of stock options, shares		827
Issuance of common stock upon exercise of stock options	26,762	$ 8	26,754
Stock-based compensation	19,855		19,855
Dividends declared	$ (52,389)			(52,389)
Ending balance, shares at Jun. 30, 2021	141,027	141,027
Ending balance at Jun. 30, 2021	$ 1,805,606	$ 1,410	1,219,487	599,231	(14,522)
Beginning balance, shares at Mar. 31, 2021		142,701
Beginning balance at Mar. 31, 2021	1,829,108	$ 1,427	1,208,433	634,651	(15,403)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	133,778			133,778
Other comprehensive income (loss)	881				881
Purchase and retirement of common stock, shares		(2,086)
Purchase and retirement of common stock	(129,219)	$ (21)	(12,389)	(116,809)
Issuance of common stock under employee stock purchase plan, shares		18
Issuance of common stock under employee stock purchase plan	966		966
Issuance of common stock upon exercise of stock options, shares		394
Issuance of common stock upon exercise of stock options	12,378	$ 4	12,374
Stock-based compensation	10,103		10,103
Dividends declared	$ (52,389)			(52,389)
Ending balance, shares at Jun. 30, 2021	141,027	141,027
Ending balance at Jun. 30, 2021	$ 1,805,606	$ 1,410	$ 1,219,487	$ 599,231	$ (14,522)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	Jun. 02, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (in USD per share)	$ 0.37	$ 0.37	$ 0.35	$ 0.37	$ 0.35

Consolidated Condensed Statemen

Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income	$ 263,248	$ 210,308
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1)	61,749	53,824
Net cash provided by operating activities	324,997	264,132
Cash flows from investing activities:
Additions to property and equipment	(15,469)	(34,442)
Additions to capitalized software	(12,271)	(12,533)
Purchases of marketable securities	(81,541)	(60,764)
Prepayments and maturities of marketable securities	64,194	71,782
Sales of marketable securities	0	64
Other investing activities	(11,000)	(1,500)
Net cash used in investing activities	(56,087)	(37,393)
Cash flows from financing activities:
Payment of contingent consideration	(3,965)	(633)
Purchase and retirement of common stock	(197,322)	(219,404)
Proceeds from issuance of common stock	28,867	24,587
Payment of dividends	(105,516)	(103,914)
Net cash used in financing activities	(277,936)	(299,364)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,578	(10,545)
Net decrease in cash, cash equivalents and restricted cash	(6,448)	(83,170)
Cash, cash equivalents and restricted cash, beginning of period	787,727	844,547
Cash, cash equivalents and restricted cash, end of period	$ 781,279	$ 761,377

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
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 comprehensive platforms, services and infrastructure—encompassing technology, operational, and investment management services—to help wealth managers, financial advisors, investment managers, family offices, institutional and private investors create and manage wealth. Investment processing platforms provide technologies and business process outsourcing services for wealth managers and investment advisors. These solutions include investment advisory, client relationship, and other technology-enabled capabilities for the front office; administrative and investment services for the middle office; and accounting and processing services for the back office. Revenues from investment processing platforms are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Investment operations platforms provide business process outsourcing services for investment managers and asset owners. These platforms support a broad range of traditional and alternative investments and provide technology-enabled information analytics and investor capabilities for the front office; administrative and investment services for the middle office; and fund administration and accounting services for the back office. Revenues from investment operations platforms are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment management platforms provide comprehensive solutions for managing personal and institutional wealth. These platforms include goals-based investment strategies; SEI-sponsored investment products, including mutual funds, collective investment products, alternative investment portfolios and separately managed accounts (SMA); and other market-specific advice, technology and operational components. These platforms are offered to wealth managers as part of a complete goals-based investment program for their end-investors. For institutional investors, the Company provides Outsourced Chief Investment Officer (OCIO) solutions that include investment management programs, as well as advisory and administrative services. Revenues from investment management 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, 2021, the results of operations for the three and six months ended June 30, 2021 and 2020, and cash flows for the six-months ended June 30, 2021 and 2020. 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, 2020. There have been no significant changes in significant accounting policies during the six months ended June 30, 2021 as compared to the significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2020. 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 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 $11,256 and $9,714 in fees during the three months ended June 30, 2021 and 2020, respectively. During the six months ended June 30, 2021 and 2020, the Company waived $21,489 and $16,355, 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). See Note 13 for related disclosures regarding revenue recognition. Cash and Cash Equivalents Cash and cash equivalents includes $313,481 and $347,082 at June 30, 2021 and December 31, 2020, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds. Restricted Cash Restricted cash includes $250 and $3,000 at June 30, 2021 and December 31, 2020, respectively, segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $101 at June 30, 2021 and December 31, 2020 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 $12,271 and $12,533 of software development costs during the six months ended June 30, 2021 and 2020, respectively. The Company's software development costs primarily relate to significant enhancements to the SEI Wealth Platform SM (SWP). The Company capitalized $12,172 and $11,785 of software development costs for significant enhancements to SWP during the six months ended June 30, 2021 and 2020, respectively. As of June 30, 2021, the net book value of SWP was $246,005 . The net book value includes $20,897 of capitalized software development costs in-progress associated with future releases of SWP. Capitalized software development costs in-progress associated with future releases of SWP were $13,409 as of December 31, 2020. SWP has a weighted average remaining life of 10.0 years. Amortization expense for SWP was $23,876 and $21,656 during the six months ended June 30, 2021 and 2020, respectively. Earnings per Share The calculations of basic and diluted earnings per share for the three and six months ended June 30, 2021 and 2020 are: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Net income $ 133,778 $ 101,066 $ 263,248 $ 210,308 Shares used to compute basic earnings per common share 142,074,000 147,478,000 142,638,000 148,473,000 Dilutive effect of stock options 2,138,000 2,120,000 2,121,000 2,510,000 Shares used to compute diluted earnings per common share 144,212,000 149,598,000 144,759,000 150,983,000 Basic earnings per common share $ 0.94 $ 0.69 $ 1.85 $ 1.42 Diluted earnings per common share $ 0.93 $ 0.68 $ 1.82 $ 1.39 During the three months ended June 30, 2021 and 2020, employee stock options to purchase 11,530,000 and 8,154,000 shares of common stock with an average exercise price of $57.77 and $58.26, respectively, were outstanding but not included in the computation of diluted earnings per common share. During the six months ended June 30,2021 and 2020, employee stock options to purchase 11,623,000 and 7,781,000 shares of common stock with an average exercise price of $57.77 and $58.50, 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. Reclassifications Certain prior year amounts have been reclassified to conform to current year presentation. Statements of Cash Flows For purposes of the Consolidated Statements of Cash Flows, the Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents. The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the six months ended June 30: 2021 2020 Net income $ 263,248 $ 210,308 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 16,733 15,113 Amortization 29,075 26,217 Equity in earnings of unconsolidated affiliate (68,415) (58,183) Distributions received from unconsolidated affiliate 68,064 73,241 Stock-based compensation 19,855 13,991 Provision for losses on receivables 2,088 (122) Deferred income tax expense (6,869) (5,459) Net (gain) loss from investments (709) 2,086 Change in other long-term liabilities 987 (1,448) Change in other assets (976) (6,135) Contract costs capitalized, net of amortization 429 (2,117) Other 929 (1,217) Change in current assets and liabilities (Increase) decrease in Receivables from investment products (906) 4,292 Receivables (26,437) (11,134) Other current assets 538 (2,716) Advances due from unconsolidated affiliate 51,364 11,261 (Decrease) increase in Accounts payable 1,525 6,357 Accrued liabilities (25,721) (9,367) Deferred revenue 195 (836) Total adjustments 61,749 53,824 Net cash provided by operating activities $ 324,997 $ 264,132

Investment In Unconsolidated Af

Investment In Unconsolidated Affiliate	6 Months Ended
	Jun. 30, 2021
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, 2021 was 38.7%%. The Company accounts for its interest in LSV using the equity method because of its less than 50% 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, 2021, the Company’s total investment in LSV was $47,420. The Company receives partnership distributions from LSV on a quarterly basis. The Company received partnership distributions from LSV of $68,064 and $73,241 in the six months ended June 30, 2021 and 2020, 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 $35,065 and $28,276 during the three months ended June 30, 2021 and 2020, respectively. During the six months ended June 30, 2021 and 2020, the Company's proportionate share in the earnings of LSV was $68,415 and $58,183, respectively. These tables contain condensed financial information of LSV: Condensed Statement of Operations Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Revenues $ 116,392 $ 94,648 $ 227,229 $ 194,644 Net income 90,520 72,847 176,440 149,744 Condensed Balance Sheets June 30, 2021 December 31, 2020 Current assets $ 129,529 $ 151,515 Non-current assets 4,023 4,296 Total assets $ 133,552 $ 155,811 Current liabilities $ 55,625 $ 77,077 Non-current liabilities 4,249 4,620 Partners’ capital 73,678 74,114 Total liabilities and partners’ capital $ 133,552 $ 155,811 On April 1, 2021, LSV provided an interest in the partnership to select key employees which reduced the ownership percentage of each existing partner on a pro-rata basis. As a result, the Company's total partnership interest in LSV was reduced slightly to approximately 38.7% from approximately 38.8%.

Composition of Certain Financia

Composition of Certain Financial Statement Captions	6 Months Ended
	Jun. 30, 2021
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, 2021 December 31, 2020 Trade receivables $ 99,140 $ 99,106 Fees earned, not billed 300,834 262,167 Other receivables 12,782 25,046 412,756 386,319 Less: Allowance for doubtful accounts (3,188) (1,100) $ 409,568 $ 385,219 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, 2021 December 31, 2020 Buildings $ 210,053 $ 206,151 Equipment 147,224 141,820 Land 24,344 24,179 Purchased software 152,259 147,838 Furniture and fixtures 21,535 21,439 Leasehold improvements 22,246 21,604 Construction in progress 1,124 4,660 578,785 567,691 Less: Accumulated depreciation (394,743) (378,639) Property and Equipment, net $ 184,042 $ 189,052 The Company recognized $16,733 and $15,113 in depreciation expense related to property and equipment for the six months ended June 30, 2021 and 2020, respectively. Deferred Contract Costs Deferred contract costs, which primarily consist of deferred sales commissions, were $33,352 and $33,781 as of June 30, 2021 and December 31, 2020, respectively. The Company deferred expenses related to contract costs of $1,674 and $1,752 during the three months ended June 30, 2021 and 2020, respectively. During the six months ended June 30, 2021 and 2020, the Company deferred expenses related to contract costs of $4,046 and $4,749, respectively. Amortization expense related to deferred contract costs were $4,475 and $2,632 during the six months ended June 30, 2021 and 2020, respectively, and are included in Compensation, benefits and other personnel on the accompanying Consolidated Statements of Operations. There was no impairment loss in relation to deferred contract costs during the six months ended June 30, 2021. Accrued Liabilities Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: June 30, 2021 December 31, 2020 Accrued employee compensation $ 65,355 $ 95,656 Accrued employee benefits and other personnel 15,073 18,770 Accrued consulting, outsourcing and professional fees 36,147 31,907 Accrued sub-advisory, distribution and other asset management fees 59,944 49,924 Accrued dividend payable — 53,127 Other accrued liabilities 35,465 50,461 Total accrued liabilities $ 211,984 $ 299,845

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2021
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 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 2023 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, 2021 were consistent with those as described in the Company's Annual Report on Form 10-K at December 31, 2020. The Company had no Level 3 financial assets at June 30, 2021 or December 31, 2020 that were required to be measured at fair value on a recurring basis. Level 3 financial liabilities at June 30, 2021 and December 31, 2020 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 other factors. There were no transfers of financial assets between levels within the fair value hierarchy during the six months ended June 30, 2021. 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, 2021 Quoted Prices in Significant Equity securities $ 12,731 $ 12,731 $ — Available-for-sale debt securities 117,308 — 117,308 Fixed-income securities owned 26,174 — 26,174 Investment funds sponsored by LSV (1) 6,932 $ 163,145 $ 12,731 $ 143,482 Fair Value Measurements at the End of the Reporting Period Using Assets December 31, 2020 Quoted Prices in Significant Equity securities $ 12,142 $ 12,142 $ — Available-for-sale debt securities 93,277 — 93,277 Fixed-income securities owned 34,064 — 34,064 Investment funds sponsored by LSV (1) 6,166 $ 145,649 $ 12,142 $ 127,341

Marketable Securities

Marketable Securities	6 Months Ended
	Jun. 30, 2021
Marketable Securities [Abstract]
Marketable Securities	Marketable Securities Marketable securities include investments in money market funds and commercial paper classified as cash equivalents, available-for-sale debt securities, investments in SEI-sponsored and non-SEI-sponsored mutual funds, equities, investments in funds sponsored by LSV and securities owned by SIDCO. Cash Equivalents Investments in money market funds and commercial paper classified as cash equivalents had a fair value of $452,428 and $462,624 at June 30, 2021 and December 31, 2020, respectively. There were no material unrealized or realized gains or losses from these investments during the six months ended June 30, 2021 and 2020. Investments in money market funds and commercial paper are Level 1 assets. Available for Sale and Equity Securities Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of: At June 30, 2021 Cost Gross Gross Fair Available-for-sale debt securities $ 115,818 $ 1,490 $ — $ 117,308 SEI-sponsored mutual funds 6,896 666 — 7,562 Equities and other mutual funds 4,933 236 — 5,169 $ 127,647 $ 2,392 $ — $ 130,039 At December 31, 2020 Cost Gross Gross Fair Available-for-sale debt securities $ 91,262 $ 2,015 $ — $ 93,277 SEI-sponsored mutual funds 6,866 382 — 7,248 Equities and other mutual funds 4,421 473 — 4,894 $ 102,549 $ 2,870 $ — $ 105,419 Net unrealized gains at June 30, 2021 of available-for-sale debt securities were $1,148 (net of income tax expense of $342). Net unrealized gains at December 31, 2020 of available-for-sale debt securities were $1,551 (net of income tax expense of $464). These net unrealized gains are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets. There were gross realized losses of $556 and $280 from available-for-sale debt securities during the six months ended June 30, 2021 and 2020, respectively. There were no gross realized gains from available-for-sale debt securities during the six months ended June 30, 2021 and 2020. Realized losses from available-for-sale debt securities, including amounts reclassified from accumulated comprehensive loss, are reflected in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations. There were gross realized gains of $613 and gross realized losses of $59 from mutual funds and equities during the six months ended June 30, 2021. There were gross realized gains of $196 and gross realized losses of $240 from mutual funds and equities during the six months ended June 30, 2020. Gains and losses from mutual funds and equities 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 funds had a fair value of $6,932 and $6,166 at June 30, 2021 and December 31, 2020, respectively. The Company recognized unrealized gains of $309 and $996 during the three months ended June 30, 2021 and 2020, respectively, from the change in fair value of the funds. The Company recognized unrealized gains of $766 and unrealized losses of $1,239 during the six months ended June 30, 2021 and 2020, 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

Line of Credit

Line of Credit	6 Months Ended
	Jun. 30, 2021
Line of Credit Facility [Abstract]
Line of Credit	Line of Credit On April 23, 2021 (the Closing Date), the Company entered into a new five-year $325,000 Credit Agreement (the Credit Facility) with Wells Fargo Bank, N.A., and a syndicate of other lenders. The Credit Facility became available on the Closing Date and replaced the former credit facility agreement (the 2016 Credit Facility). The Credit Facility is scheduled to expire in April 2026, 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% to 1.00% or the London InterBank Offered Rate (LIBOR) plus a premium that can range from 1.25% to 2.00% 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%, b) the prime commercial lending rate of Wells Fargo, c) the applicable LIBOR plus 1.00%, or d) 0%. The Credit Facility includes fallback language clearly defining an alternative reference rate which provides for specified replacement rates upon a LIBOR cessation event. At the time of a LIBOR cessation event, the replacement rate, the Secured Overnight Financing Rate (SOFR), self-executes without the need for negotiations or a formal amendment process. 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% of the amount of the unused portion to 0.30%, 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% plus an issuance fee of 0.200% of the aggregate face amount of the outstanding letters of credit issued under the Credit Facility. The Credit Facility contains covenants with restrictions on the ability of the Company to do transactions with affiliates other than wholly-owned subsidiaries or to incur liens or certain types of indebtedness 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. 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, 2021, the Company had outstanding letters of credit of $5,808 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 2021. The amount of the Credit Facility that is available for general corporate purposes as of June 30, 2021 was $319,192. The Company was in compliance with all covenants of the credit facilities during the six months ended June 30, 2021.

Shareholders' Equity

Shareholders' Equity	6 Months Ended
	Jun. 30, 2021
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% when a specified financial vesting target is achieved, and the remaining 50% when a second, higher specified financial vesting 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 The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three and six months ended June 30, 2021 and 2020, respectively, as follows: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Stock-based compensation expense $ 10,103 $ 7,062 $ 19,855 $ 13,991 Less: Deferred tax benefit (1,904) (1,318) (3,758) (2,703) Stock-based compensation expense, net of tax $ 8,199 $ 5,744 $ 16,097 $ 11,288 The Company revised its estimate of when some vesting targets are expected to be achieved. This change in management's estimate resulted in an increase of $759 in stock-based compensation expense during the six months ended June 30, 2021. As of June 30, 2021, there was approximately $86,667 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, 2021 was $23,814. The total options exercisable as of June 30, 2021 had an intrinsic value of $125,738. 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, 2021 and the weighted average exercise price of the options. The market value of the Company’s common stock as of June 30, 2021 was $61.97 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of June 30, 2021 was $40.35. Total options that were outstanding as of June 30, 2021 were 17,345,000 . Total options that were exercisable as of June 30, 2021 were 5,814,000 . Common Stock Buyback The Company’s Board of Directors, under multiple authorizations, has authorized the repurchase of common stock on the open market or through private transactions. The Company purchased 3,238,000 shares at a total cost of $196,158 during the six months ended June 30, 2021, 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. On June 2, 2021, the Company's Board of Directors approved an increase in the stock repurchase program by an additional $250,000. As of June 30, 2021, the Company had approximately $246,669 of authorization remaining for the purchase of common stock under the program. The Company immediately retires its common stock when purchased. Upon retirement, the Company reduces Capital in excess of par value for the average capital per share outstanding and the remainder is charged against Retained earnings. If the Company reduces its Retained earnings to zero, any subsequent purchases of common stock will be charged entirely to Capital in excess of par value. Cash Dividend On June 2, 2021, the Board of Directors declared a cash dividend of $0.37 per share on the Company's common stock, which was paid on June 22, 2021, to shareholders of record on June 14, 2021. Cash dividends declared during the six months ended June 30, 2021 and 2020 were $52,389 and $51,462, respectively.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2021
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 Accumulated Other Comprehensive Loss Balance, January 1, 2021 $ (18,349) $ 1,551 $ (16,798) Other comprehensive income before reclassifications 2,679 (835) 1,844 Amounts reclassified from accumulated other comprehensive loss — 432 432 Net current-period other comprehensive income 2,679 (403) 2,276 Balance, June 30, 2021 $ (15,670) $ 1,148 $ (14,522)

Business Segment Information

Business Segment Information	6 Months Ended
	Jun. 30, 2021
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 OCIO solutions, including investment management and administrative outsourcing platforms to retirement plan sponsors, healthcare systems, higher education and other 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 network and data protection services; modularizing larger technology platforms into stand-alone components; entering new markets; and conducting other research and development activities. The information in the following tables is derived from internal financial reporting used for corporate management purposes. There are no inter-segment revenues for the three and six months ended June 30, 2021 and 2020. 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, 2020. The following tables highlight certain financial information about each of the business segments for the three months ended June 30, 2021 and 2020: Private Banks Investment Institutional Investment Investments Total For the Three Months Ended June 30, 2021 Revenues $ 123,676 $ 119,396 $ 85,699 $ 142,808 $ 4,072 $ 475,651 Expenses 117,654 59,133 41,895 84,995 13,631 317,308 Operating profit (loss) $ 6,022 $ 60,263 $ 43,804 $ 57,813 $ (9,559) $ 158,343 Private Investment Institutional Investment Investments Total For the Three Months Ended June 30, 2020 Revenues $ 107,726 $ 93,708 $ 76,523 $ 119,340 $ 3,349 $ 400,646 Expenses 107,723 50,149 36,937 74,668 13,466 282,943 Operating profit (loss) $ 3 $ 43,559 $ 39,586 $ 44,672 $ (10,117) $ 117,703 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, 2021 and 2020 is as follows: 2021 2020 Total operating profit from segments $ 158,343 $ 117,703 Corporate overhead expenses (22,322) (17,391) Income from operations $ 136,021 $ 100,312 The following tables provide additional information for the three months ended June 30, 2021 and 2020 pertaining to the business segments: Capital Expenditures (1) Depreciation 2021 2020 2021 2020 Private Banks $ 8,594 $ 6,634 $ 4,178 $ 3,965 Investment Advisors 3,580 3,803 1,417 1,172 Institutional Investors 884 1,029 353 301 Investment Managers 3,373 7,259 2,027 1,869 Investments in New Businesses 313 332 100 76 Total from business segments $ 16,744 $ 19,057 $ 8,075 $ 7,383 Corporate overhead 418 798 349 257 $ 17,162 $ 19,855 $ 8,424 $ 7,640 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2021 2020 Private Banks $ 8,633 $ 7,464 Investment Advisors 2,909 2,664 Institutional Investors 427 427 Investment Managers 2,444 2,342 Investments in New Businesses 185 185 Total from business segments $ 14,598 $ 13,082 Corporate overhead 125 58 $ 14,723 $ 13,140 The following tables highlight certain financial information about each of business segment for the six months ended June 30, 2021 and 2020: Private Investment Institutional Investment Investments Total For the Six Months Ended June 30, 2021 Revenues $ 241,284 $ 232,690 $ 170,198 $ 279,227 $ 7,938 $ 931,337 Expenses 228,378 114,160 81,053 168,015 27,035 618,641 Operating profit (loss) $ 12,906 $ 118,530 $ 89,145 $ 111,212 $ (19,097) $ 312,696 Private Investment Institutional Investment Investments Total For the Six Months Ended June 30, 2020 Revenues $ 220,947 $ 196,029 $ 155,726 $ 235,969 $ 6,737 $ 815,408 Expenses 218,376 102,581 75,204 148,957 24,376 569,494 Operating profit (loss) $ 2,571 $ 93,448 $ 80,522 $ 87,012 $ (17,639) $ 245,914 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, 2021 and 2020: 2021 2020 Total operating profit from segments $ 312,696 $ 245,914 Corporate overhead expenses (43,838) (35,374) Income from operations $ 268,858 $ 210,540 The following tables provide additional information for the six months ended June 30, 2021 and 2020: Capital Expenditures (1) Depreciation 2021 2020 2021 2020 Private Banks $ 14,423 $ 16,559 $ 8,310 $ 7,847 Investment Advisors 5,888 9,193 2,706 2,323 Institutional Investors 1,395 2,387 711 603 Investment Managers 5,004 16,291 4,080 3,681 Investments in New Businesses 452 750 246 146 Total from business segments $ 27,162 $ 45,180 $ 16,053 $ 14,600 Corporate Overhead 578 1,795 680 513 $ 27,740 $ 46,975 $ 16,733 $ 15,113 Amortization 2021 2020 Private Banks $ 17,209 $ 14,885 Investment Advisors 5,536 5,316 Institutional Investors 853 854 Investment Managers 4,924 4,677 Investments in New Businesses 370 370 Total from business segments $ 28,892 $ 26,102 Corporate Overhead 183 115 $ 29,075 $ 26,217

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The gross liability for unrecognized tax benefits at June 30, 2021 and December 31, 2020 was $16,850 and $15,911, respectively, exclusive of interest and penalties, of which $16,799 and $15,761 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, 2021 and December 31, 2020, the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $2,250 and $2,105, respectively. June 30, 2021 December 31, 2020 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 16,850 $ 15,911 Interest and penalties on unrecognized benefits 2,250 2,105 Total gross uncertain tax positions $ 19,100 $ 18,016 Amount included in Current liabilities $ 6,053 $ 6,546 Amount included in Other long-term liabilities 13,047 11,470 $ 19,100 $ 18,016 The effective income tax rate for the three and six months ended June 30, 2021 and 2020 differs from the federal income tax statutory rate due to the following: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Statutory rate 21.0 % 21.0 % 21.0 % 21.0 % State taxes, net of federal tax benefit 3.2 3.3 3.2 3.2 Foreign tax expense and tax rate differential (0.1) (0.2) (0.1) (0.1) Tax benefit from stock option exercises (1.2) (0.4) (1.2) (1.3) Other, net (0.6) (0.4) (0.4) (0.4) 22.3 % 23.3 % 22.5 % 22.4 % The decrease in the effective tax rate for the three months ended June 30, 2021 was primarily due to increased tax benefits related to the higher volume of stock option exercises in 2021 compared to the prior year period. 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 2017 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2015. The Company estimates it will recognize $6,053 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, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In the ordinary course of business, the Company from time to time enters into contracts containing indemnification obligations of the Company. These obligations may require the Company to make payments to another party upon the occurrence of certain events including the failure by the Company to meet its performance obligations under the contract. These contractual indemnification provisions are often standard contractual terms of the nature customarily found in the type of contracts entered into by the Company. In many cases, there are no stated or notional amounts included in the indemnification provisions. There are no amounts reflected on the Consolidated Balance Sheets as of June 30, 2021 and December 31, 2020 related to these indemnifications. 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. A group of plaintiffs who opted out of the Lillie class filed a complaint against SEI and SPTC in the United States District Court in the Middle District of Louisiana, alleging claims essentially the same as those in Lillie. In 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. On January 31, 2019, the Judicial Panel on Multidistrict Litigation remanded the Lillie and Ahders proceedings to the Middle District of Louisiana. With respect to the Lillie proceeding, on July 9, 2019, the District Court issued an order granting SEI’s Summary Judgment Motion to dismiss the remaining Section 714(B) claim and denying Plaintiffs’ Motion for Continuance of SEI and SPTC’s Motion for Summary Judgment pursuant to Rule 56(d). On August 27, 2019, Plaintiffs-Appellants filed a Notice of Appeal to the United States Court of Appeals for the Fifth Circuit of the District Court's dismissal of the Lillie matter. On May 14, 2021, the United States Court of Appeals for the Fifth Circuit unanimously affirmed the District Court’s order granting summary judgment in favor SEI and the Insurer Defendants in the Lillie matter. With respect to the Ahders proceeding, on January 24, 2020, the District Court issued an order granting SEI’s Summary Judgment Motion to dismiss the remaining Section 714(B) claim. On March 17, 2020, Plaintiffs-Appellants filed a Notice of Appeal to the United States Court of Appeals for the Fifth Circuit of the District Court's dismissal of the Ahders matter. On December 3, 2020, the United States Court of Appeals for the Fifth Circuit unanimously affirmed the District Court’s order granting summary judgment in favor of SEI and the Insurer Defendants in the Adhers matter. 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 Multidistrict Litigation (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. SS&C Advent Matter On February 28, 2020, SEI Global Services, Inc. (SGSI), a wholly-owned subsidiary of the Company, filed a complaint under seal in the United States District Court for the Eastern District of Pennsylvania against SS&C Advent (Advent) and SS&C Technologies Holdings, Inc. (SS&C) alleging that SS&C and Advent breached the terms of the contract between the parties and asking the Court to hold SS&C and Advent to their bargained-for obligations (the Advent Matter). In addition to Breach of Contract, the complaint also includes counts for Declaratory Judgment, Tortious Interference with Existing and Prospective Contractual Relations, Violation of the New York General Business Law Section 349, Violations of Section 2 of the Sherman Antitrust Act, Promissory Estoppel and Breach of the Covenant of Good Faith and Fair Dealing. SGSI seeks various forms of relief, including declaratory judgment, specific performance under the contract, and monetary damages, including treble damages and attorney’s fees. Following various procedural actions, including an amendment of SGSI’s complaint to include additional breach of contract claims, Advent filed a motion to dismiss SGSI’s compliant. On October 23, 2020, the United States District Court for the Eastern District of Pennsylvania dismissed SEI’s federal antitrust claims and declined to rule on the state law claims on the basis that in the absence of the anti-trust claim, the court had no jurisdiction over the state law claims. SGSI has appealed the dismissal of the federal anti-trust claims to the Third Circuit Court of Appeals, which is currently pending. Since October 23, 2020, Advent and SGSI have been litigating the remaining breach of contract and tortious interference with contract claims in New York State Court. Additionally, SGSI made motions for injunctive relief to insure that Advent provided SGSI with access to the Geneva, Moxy and APX software modules as SGSI believes is required pursuant to the terms of a valid contract. On January 13, 2021, Judge Borrok of the Supreme Court of the State of New York, granted SGSI’s motion for injunctive relief and issued an Order in which he characterized the basis for Advent’s claim for breach of contract as appearing to be “pre-textual” and found that SGSI’s claims for breach of contract would likely succeed on the merits. Judge Borrok granted SGSI’s motion for injunctive relief, on a preliminary basis, and precluded SS&C Advent from: • Dishonoring their contractual obligations and commitments under the SLSA, including, denying SEI’s licenses, rights, and privileges under the SLSA; • Failing to provide new license keys for the license keys due to Geneva, Moxy, and APX, and other software products licensed by SEI pursuant to the SLSA (such new license keys to be provided no later than January 15, 2021 at 10 A.M.); • Denying to SEI any and all access to the Geneva, Moxy, and APX software and related modules as are reasonably necessary to provide access to such software to SEI’s clients; and • Denying to SEI any and all support, maintenance and technical support services for Geneva, Moxy, and APX. SS&C Advent provided SEI with the necessary access to the Geneva, Moxy and APX software modules on January 14, 2021. These have been tested, verified and are now running in the SEI production environment. On January 15, 2021, SS&C Advent appealed Judge Borrok’s order granting SEI’s motion for preliminary injunctive relief to the Appellate Division of the Supreme Court of the State of New York, First Department. The Appellate Division affirmed the injunction order on June 15, 2021. The parties are beginning discovery and participating in a voluntary mediation moderated by Judge Borrok, pursuant to which the parties are actively negotiating the terms of a settlement agreement. SEI does not believe that it will have to change providers under the current terms of its contract with SS&C Advent and that the process of litigating its rights under this contract may be a multi-year process. Consequently, SEI does not believe that the Advent Matter will create any consequence to the services SGSI provides to its clients in the near term. SEI believes that it has alternatives available to it that will enable it to continue to provide currently provided services to its clients in all material respects in the unlikely event that there ultimately is a negative outcome in the Advent Matter. SEI believes SGSI has a strong basis for proving the actions it alleges in the Advent Matter and looks forward to the opportunity to continue to assert its rights under contract. SEI expects the financial impact of litigating the Advent Matter to be immaterial. 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.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2021
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, LLC (Huntington Steele). 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. The total purchase price for Huntington Steele included a contingent purchase price payable to the sellers upon the attainment of specified financial measures determined at various intervals occurring between 2019 and 2023. The Company made payments of $3,965 and $633 during the six months ended June 30, 2021 and 2020, respectively, to the sellers. As of June 30, 2021, the current portion of the contingent consideration of $765 is included in Accrued liabilities on the accompanying Balance Sheet. The long-term portion of the contingent consideration of $7,994 is included in Other long-term liabilities on the accompanying Balance Sheet. In July 2017, the Company acquired all ownership interests of Archway Technology Partners, LLC, Archway Finance & Operations, Inc. and Keystone Capital Holdings, LLC (collectively, Archway), a provider of operating technologies and services to the family office industry. The total purchase price was allocated to Archway’s net tangible and intangible assets based upon their estimated fair values at the date of purchase. The excess purchase price over the value of the net tangible and identifiable intangible assets was recorded as goodwill. The total amount of goodwill from this transaction amounted to $52,990 and is included on the accompanying Consolidated Balance Sheets. There were no changes to goodwill during the six months ended June 30, 2021. The Company recognized $1,842 of amortization expense related to the intangible assets acquired through acquisitions of Huntington Steele and Archway during the six months ended June 30, 2021 and 2020.

Revenues from Contracts with Cu

Revenues from Contracts with Customers	6 Months Ended
	Jun. 30, 2021
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 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 business segments for the three months ended June 30, 2021 and 2020: Private Banks Investment Institutional Investment Investments Total Major Product Lines: For the Three Months Ended June 30, 2021 Investment management fees from pooled investment products $ 33,708 $ 75,039 $ 13,638 $ 14 $ 326 $ 122,725 Investment management fees from investment management agreements 603 38,345 71,342 — 3,561 113,851 Investment operations fees 402 — — 132,262 — 132,664 Investment processing fees - PaaS 55,746 — — — — 55,746 Investment processing fees - SaaS 28,442 — — 3,855 — 32,297 Professional services fees 3,928 — — 867 — 4,795 Account fees and other 847 6,012 719 5,810 185 13,573 Total revenues $ 123,676 $ 119,396 $ 85,699 $ 142,808 $ 4,072 $ 475,651 Primary Geographic Markets: United States $ 78,848 $ 119,396 $ 67,792 $ 132,648 $ 4,072 $ 402,756 United Kingdom 28,082 — 14,035 — — 42,117 Canada 12,152 — 1,198 — — 13,350 Ireland 4,594 — 2,546 10,160 — 17,300 Other — — 128 — — 128 Total revenues $ 123,676 $ 119,396 $ 85,699 $ 142,808 $ 4,072 $ 475,651 Private Investment Institutional Investment Investments Total Major Product Lines: For the Three Months Ended June 30, 2020 Investment management fees from pooled investment products $ 30,307 $ 62,251 $ 12,894 $ 163 $ 348 $ 105,963 Investment management fees from investment management agreements 292 26,545 62,924 — 2,908 92,669 Investment operations fees 438 — — 109,078 — 109,516 Investment processing fees - PaaS 44,191 — — — — 44,191 Investment processing fees - SaaS 28,047 — — 3,392 — 31,439 Professional services fees 3,157 — — 1,384 — 4,541 Account fees and other 1,294 4,912 705 5,323 93 12,327 Total revenues $ 107,726 $ 93,708 $ 76,523 $ 119,340 $ 3,349 $ 400,646 Primary Geographic Markets: United States $ 71,607 $ 93,708 $ 60,414 $ 111,137 $ 3,349 $ 340,215 United Kingdom 22,345 — 12,280 — — 34,625 Canada 9,726 — 1,431 — — 11,157 Ireland 4,048 — 2,265 8,203 — 14,516 Other — — 133 — — 133 Total revenues $ 107,726 $ 93,708 $ 76,523 $ 119,340 $ 3,349 $ 400,646 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, 2021 and 2020: Private Investment Institutional Investment Investments Total Major Product Lines: For the Six Months Ended June 30, 2021 Investment management fees from pooled investment products $ 66,272 $ 147,693 $ 27,726 $ 73 $ 655 $ 242,419 Investment management fees from investment management agreements 1,076 73,059 141,285 — 6,947 222,367 Investment operations fees 771 — — 257,423 — 258,194 Investment processing fees - PaaS 106,622 — — — — 106,622 Investment processing fees - SaaS 56,252 — — 7,561 — 63,813 Professional services fees 8,335 — — 2,014 — 10,349 Account fees and other 1,956 11,938 1,187 12,156 336 27,573 Total revenues $ 241,284 $ 232,690 $ 170,198 $ 279,227 $ 7,938 $ 931,337 Primary Geographic Markets: United States $ 153,943 $ 232,690 $ 134,512 $ 259,664 $ 7,938 $ 788,747 United Kingdom 54,747 — 27,764 — — 82,511 Canada 23,634 — 2,500 — — 26,134 Ireland 8,960 — 5,165 19,563 — 33,688 Other — — 257 — — 257 Total revenues $ 241,284 $ 232,690 $ 170,198 $ 279,227 $ 7,938 $ 931,337 Private Investment Institutional Investment Investments Total Major Product Lines: For the Six Months Ended June 30, 2020 Investment management fees from pooled investment products $ 63,151 $ 132,431 $ 26,211 $ 356 $ 707 $ 222,856 Investment management fees from investment management agreements 639 53,965 128,634 — 5,871 189,109 Investment operations fees 913 — — 215,279 — 216,192 Investment processing fees - PaaS 90,344 — — — — 90,344 Investment processing fees - SaaS 57,216 — — 6,643 — 63,859 Professional services fees 5,872 — — 2,658 — 8,530 Account fees and other 2,812 9,633 881 11,033 159 24,518 Total revenues $ 220,947 $ 196,029 $ 155,726 $ 235,969 $ 6,737 $ 815,408 Primary Geographic Markets: United States $ 145,621 $ 196,029 $ 122,503 $ 219,580 $ 6,737 $ 690,470 United Kingdom 46,704 — 25,104 — — 71,808 Canada 20,127 — 3,029 — — 23,156 Ireland 8,495 — 4,795 16,389 — 29,679 Other — — 295 — — 295 Total revenues $ 220,947 $ 196,029 $ 155,726 $ 235,969 $ 6,737 $ 815,408 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 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 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 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 - 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. 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. 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. Account fees and 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.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policy)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of PresentationThe accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America.
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.
Revenue Recognition	Revenue RecognitionRevenue 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 Cash and cash equivalents includes $313,481 and $347,082 at June 30, 2021 and December 31, 2020, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds. 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.
Restricted Cash	Restricted CashRestricted cash includes $250 and $3,000 at June 30, 2021 and December 31, 2020, respectively, segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $101 at June 30, 2021 and December 31, 2020 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.
Reclassifications	Reclassifications Certain prior year amounts have been reclassified to conform to current year presentation.
Equity Method Investments	The Company accounts for its interest in LSV using the equity method because of its less than 50% 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 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 2023 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.
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 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, 2021
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, 2021 and 2020 are: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Net income $ 133,778 $ 101,066 $ 263,248 $ 210,308 Shares used to compute basic earnings per common share 142,074,000 147,478,000 142,638,000 148,473,000 Dilutive effect of stock options 2,138,000 2,120,000 2,121,000 2,510,000 Shares used to compute diluted earnings per common share 144,212,000 149,598,000 144,759,000 150,983,000 Basic earnings per common share $ 0.94 $ 0.69 $ 1.85 $ 1.42 Diluted earnings per common share $ 0.93 $ 0.68 $ 1.82 $ 1.39
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: 2021 2020 Net income $ 263,248 $ 210,308 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 16,733 15,113 Amortization 29,075 26,217 Equity in earnings of unconsolidated affiliate (68,415) (58,183) Distributions received from unconsolidated affiliate 68,064 73,241 Stock-based compensation 19,855 13,991 Provision for losses on receivables 2,088 (122) Deferred income tax expense (6,869) (5,459) Net (gain) loss from investments (709) 2,086 Change in other long-term liabilities 987 (1,448) Change in other assets (976) (6,135) Contract costs capitalized, net of amortization 429 (2,117) Other 929 (1,217) Change in current assets and liabilities (Increase) decrease in Receivables from investment products (906) 4,292 Receivables (26,437) (11,134) Other current assets 538 (2,716) Advances due from unconsolidated affiliate 51,364 11,261 (Decrease) increase in Accounts payable 1,525 6,357 Accrued liabilities (25,721) (9,367) Deferred revenue 195 (836) Total adjustments 61,749 53,824 Net cash provided by operating activities $ 324,997 $ 264,132

Investment In Unconsolidated _2

Investment In Unconsolidated Affiliate (Tables)	6 Months Ended
	Jun. 30, 2021
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, 2021 2020 2021 2020 Revenues $ 116,392 $ 94,648 $ 227,229 $ 194,644 Net income 90,520 72,847 176,440 149,744 Condensed Balance Sheets June 30, 2021 December 31, 2020 Current assets $ 129,529 $ 151,515 Non-current assets 4,023 4,296 Total assets $ 133,552 $ 155,811 Current liabilities $ 55,625 $ 77,077 Non-current liabilities 4,249 4,620 Partners’ capital 73,678 74,114 Total liabilities and partners’ capital $ 133,552 $ 155,811

Composition of Certain Financ_2

Composition of Certain Financial Statement Captions (Tables)	6 Months Ended
	Jun. 30, 2021
Items Included in Consolidated Statement of Financial Condition [Abstract]
Receivables	Receivables on the accompanying Consolidated Balance Sheets consist of: June 30, 2021 December 31, 2020 Trade receivables $ 99,140 $ 99,106 Fees earned, not billed 300,834 262,167 Other receivables 12,782 25,046 412,756 386,319 Less: Allowance for doubtful accounts (3,188) (1,100) $ 409,568 $ 385,219
Property And Equipment	Property and Equipment on the accompanying Consolidated Balance Sheets consists of: June 30, 2021 December 31, 2020 Buildings $ 210,053 $ 206,151 Equipment 147,224 141,820 Land 24,344 24,179 Purchased software 152,259 147,838 Furniture and fixtures 21,535 21,439 Leasehold improvements 22,246 21,604 Construction in progress 1,124 4,660 578,785 567,691 Less: Accumulated depreciation (394,743) (378,639) Property and Equipment, net $ 184,042 $ 189,052
Accrued Liabilities	Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: June 30, 2021 December 31, 2020 Accrued employee compensation $ 65,355 $ 95,656 Accrued employee benefits and other personnel 15,073 18,770 Accrued consulting, outsourcing and professional fees 36,147 31,907 Accrued sub-advisory, distribution and other asset management fees 59,944 49,924 Accrued dividend payable — 53,127 Other accrued liabilities 35,465 50,461 Total accrued liabilities $ 211,984 $ 299,845

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2021
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, 2021 Quoted Prices in Significant Equity securities $ 12,731 $ 12,731 $ — Available-for-sale debt securities 117,308 — 117,308 Fixed-income securities owned 26,174 — 26,174 Investment funds sponsored by LSV (1) 6,932 $ 163,145 $ 12,731 $ 143,482 Fair Value Measurements at the End of the Reporting Period Using Assets December 31, 2020 Quoted Prices in Significant Equity securities $ 12,142 $ 12,142 $ — Available-for-sale debt securities 93,277 — 93,277 Fixed-income securities owned 34,064 — 34,064 Investment funds sponsored by LSV (1) 6,166 $ 145,649 $ 12,142 $ 127,341

Marketable Securities (Tables)

Marketable Securities (Tables)	6 Months Ended
	Jun. 30, 2021
Marketable Securities [Abstract]
Investments Available For Sale	Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of: At June 30, 2021 Cost Gross Gross Fair Available-for-sale debt securities $ 115,818 $ 1,490 $ — $ 117,308 SEI-sponsored mutual funds 6,896 666 — 7,562 Equities and other mutual funds 4,933 236 — 5,169 $ 127,647 $ 2,392 $ — $ 130,039 At December 31, 2020 Cost Gross Gross Fair Available-for-sale debt securities $ 91,262 $ 2,015 $ — $ 93,277 SEI-sponsored mutual funds 6,866 382 — 7,248 Equities and other mutual funds 4,421 473 — 4,894 $ 102,549 $ 2,870 $ — $ 105,419

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2021
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, 2021 and 2020, respectively, as follows: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Stock-based compensation expense $ 10,103 $ 7,062 $ 19,855 $ 13,991 Less: Deferred tax benefit (1,904) (1,318) (3,758) (2,703) Stock-based compensation expense, net of tax $ 8,199 $ 5,744 $ 16,097 $ 11,288

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Jun. 30, 2021
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 Accumulated Other Comprehensive Loss Balance, January 1, 2021 $ (18,349) $ 1,551 $ (16,798) Other comprehensive income before reclassifications 2,679 (835) 1,844 Amounts reclassified from accumulated other comprehensive loss — 432 432 Net current-period other comprehensive income 2,679 (403) 2,276 Balance, June 30, 2021 $ (15,670) $ 1,148 $ (14,522)

Business Segment Information (T

Business Segment Information (Tables)	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Schedule Of Financial Information About Business Segments	The following tables highlight certain financial information about each of the business segments for the three months ended June 30, 2021 and 2020: Private Banks Investment Institutional Investment Investments Total For the Three Months Ended June 30, 2021 Revenues $ 123,676 $ 119,396 $ 85,699 $ 142,808 $ 4,072 $ 475,651 Expenses 117,654 59,133 41,895 84,995 13,631 317,308 Operating profit (loss) $ 6,022 $ 60,263 $ 43,804 $ 57,813 $ (9,559) $ 158,343 Private Investment Institutional Investment Investments Total For the Three Months Ended June 30, 2020 Revenues $ 107,726 $ 93,708 $ 76,523 $ 119,340 $ 3,349 $ 400,646 Expenses 107,723 50,149 36,937 74,668 13,466 282,943 Operating profit (loss) $ 3 $ 43,559 $ 39,586 $ 44,672 $ (10,117) $ 117,703 The following tables highlight certain financial information about each of business segment for the six months ended June 30, 2021 and 2020: Private Investment Institutional Investment Investments Total For the Six Months Ended June 30, 2021 Revenues $ 241,284 $ 232,690 $ 170,198 $ 279,227 $ 7,938 $ 931,337 Expenses 228,378 114,160 81,053 168,015 27,035 618,641 Operating profit (loss) $ 12,906 $ 118,530 $ 89,145 $ 111,212 $ (19,097) $ 312,696 Private Investment Institutional Investment Investments Total For the Six Months Ended June 30, 2020 Revenues $ 220,947 $ 196,029 $ 155,726 $ 235,969 $ 6,737 $ 815,408 Expenses 218,376 102,581 75,204 148,957 24,376 569,494 Operating profit (loss) $ 2,571 $ 93,448 $ 80,522 $ 87,012 $ (17,639) $ 245,914
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, 2021 and 2020 is as follows: 2021 2020 Total operating profit from segments $ 158,343 $ 117,703 Corporate overhead expenses (22,322) (17,391) Income from operations $ 136,021 $ 100,312 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, 2021 and 2020: 2021 2020 Total operating profit from segments $ 312,696 $ 245,914 Corporate overhead expenses (43,838) (35,374) Income from operations $ 268,858 $ 210,540
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated	The following tables provide additional information for the three months ended June 30, 2021 and 2020 pertaining to the business segments: Capital Expenditures (1) Depreciation 2021 2020 2021 2020 Private Banks $ 8,594 $ 6,634 $ 4,178 $ 3,965 Investment Advisors 3,580 3,803 1,417 1,172 Institutional Investors 884 1,029 353 301 Investment Managers 3,373 7,259 2,027 1,869 Investments in New Businesses 313 332 100 76 Total from business segments $ 16,744 $ 19,057 $ 8,075 $ 7,383 Corporate overhead 418 798 349 257 $ 17,162 $ 19,855 $ 8,424 $ 7,640 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2021 2020 Private Banks $ 8,633 $ 7,464 Investment Advisors 2,909 2,664 Institutional Investors 427 427 Investment Managers 2,444 2,342 Investments in New Businesses 185 185 Total from business segments $ 14,598 $ 13,082 Corporate overhead 125 58 $ 14,723 $ 13,140 The following tables provide additional information for the six months ended June 30, 2021 and 2020: Capital Expenditures (1) Depreciation 2021 2020 2021 2020 Private Banks $ 14,423 $ 16,559 $ 8,310 $ 7,847 Investment Advisors 5,888 9,193 2,706 2,323 Institutional Investors 1,395 2,387 711 603 Investment Managers 5,004 16,291 4,080 3,681 Investments in New Businesses 452 750 246 146 Total from business segments $ 27,162 $ 45,180 $ 16,053 $ 14,600 Corporate Overhead 578 1,795 680 513 $ 27,740 $ 46,975 $ 16,733 $ 15,113 Amortization 2021 2020 Private Banks $ 17,209 $ 14,885 Investment Advisors 5,536 5,316 Institutional Investors 853 854 Investment Managers 4,924 4,677 Investments in New Businesses 370 370 Total from business segments $ 28,892 $ 26,102 Corporate Overhead 183 115 $ 29,075 $ 26,217

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Schedule Of Interest And Penalties	June 30, 2021 December 31, 2020 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 16,850 $ 15,911 Interest and penalties on unrecognized benefits 2,250 2,105 Total gross uncertain tax positions $ 19,100 $ 18,016 Amount included in Current liabilities $ 6,053 $ 6,546 Amount included in Other long-term liabilities 13,047 11,470 $ 19,100 $ 18,016
Schedule of Effective Income Tax Rate Reconciliation	The effective income tax rate for the three and six months ended June 30, 2021 and 2020 differs from the federal income tax statutory rate due to the following: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Statutory rate 21.0 % 21.0 % 21.0 % 21.0 % State taxes, net of federal tax benefit 3.2 3.3 3.2 3.2 Foreign tax expense and tax rate differential (0.1) (0.2) (0.1) (0.1) Tax benefit from stock option exercises (1.2) (0.4) (1.2) (1.3) Other, net (0.6) (0.4) (0.4) (0.4) 22.3 % 23.3 % 22.5 % 22.4 %

Revenues from Contracts with _2

Revenues from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2021
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 business segments for the three months ended June 30, 2021 and 2020: Private Banks Investment Institutional Investment Investments Total Major Product Lines: For the Three Months Ended June 30, 2021 Investment management fees from pooled investment products $ 33,708 $ 75,039 $ 13,638 $ 14 $ 326 $ 122,725 Investment management fees from investment management agreements 603 38,345 71,342 — 3,561 113,851 Investment operations fees 402 — — 132,262 — 132,664 Investment processing fees - PaaS 55,746 — — — — 55,746 Investment processing fees - SaaS 28,442 — — 3,855 — 32,297 Professional services fees 3,928 — — 867 — 4,795 Account fees and other 847 6,012 719 5,810 185 13,573 Total revenues $ 123,676 $ 119,396 $ 85,699 $ 142,808 $ 4,072 $ 475,651 Primary Geographic Markets: United States $ 78,848 $ 119,396 $ 67,792 $ 132,648 $ 4,072 $ 402,756 United Kingdom 28,082 — 14,035 — — 42,117 Canada 12,152 — 1,198 — — 13,350 Ireland 4,594 — 2,546 10,160 — 17,300 Other — — 128 — — 128 Total revenues $ 123,676 $ 119,396 $ 85,699 $ 142,808 $ 4,072 $ 475,651 Private Investment Institutional Investment Investments Total Major Product Lines: For the Three Months Ended June 30, 2020 Investment management fees from pooled investment products $ 30,307 $ 62,251 $ 12,894 $ 163 $ 348 $ 105,963 Investment management fees from investment management agreements 292 26,545 62,924 — 2,908 92,669 Investment operations fees 438 — — 109,078 — 109,516 Investment processing fees - PaaS 44,191 — — — — 44,191 Investment processing fees - SaaS 28,047 — — 3,392 — 31,439 Professional services fees 3,157 — — 1,384 — 4,541 Account fees and other 1,294 4,912 705 5,323 93 12,327 Total revenues $ 107,726 $ 93,708 $ 76,523 $ 119,340 $ 3,349 $ 400,646 Primary Geographic Markets: United States $ 71,607 $ 93,708 $ 60,414 $ 111,137 $ 3,349 $ 340,215 United Kingdom 22,345 — 12,280 — — 34,625 Canada 9,726 — 1,431 — — 11,157 Ireland 4,048 — 2,265 8,203 — 14,516 Other — — 133 — — 133 Total revenues $ 107,726 $ 93,708 $ 76,523 $ 119,340 $ 3,349 $ 400,646 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, 2021 and 2020: Private Investment Institutional Investment Investments Total Major Product Lines: For the Six Months Ended June 30, 2021 Investment management fees from pooled investment products $ 66,272 $ 147,693 $ 27,726 $ 73 $ 655 $ 242,419 Investment management fees from investment management agreements 1,076 73,059 141,285 — 6,947 222,367 Investment operations fees 771 — — 257,423 — 258,194 Investment processing fees - PaaS 106,622 — — — — 106,622 Investment processing fees - SaaS 56,252 — — 7,561 — 63,813 Professional services fees 8,335 — — 2,014 — 10,349 Account fees and other 1,956 11,938 1,187 12,156 336 27,573 Total revenues $ 241,284 $ 232,690 $ 170,198 $ 279,227 $ 7,938 $ 931,337 Primary Geographic Markets: United States $ 153,943 $ 232,690 $ 134,512 $ 259,664 $ 7,938 $ 788,747 United Kingdom 54,747 — 27,764 — — 82,511 Canada 23,634 — 2,500 — — 26,134 Ireland 8,960 — 5,165 19,563 — 33,688 Other — — 257 — — 257 Total revenues $ 241,284 $ 232,690 $ 170,198 $ 279,227 $ 7,938 $ 931,337 Private Investment Institutional Investment Investments Total Major Product Lines: For the Six Months Ended June 30, 2020 Investment management fees from pooled investment products $ 63,151 $ 132,431 $ 26,211 $ 356 $ 707 $ 222,856 Investment management fees from investment management agreements 639 53,965 128,634 — 5,871 189,109 Investment operations fees 913 — — 215,279 — 216,192 Investment processing fees - PaaS 90,344 — — — — 90,344 Investment processing fees - SaaS 57,216 — — 6,643 — 63,859 Professional services fees 5,872 — — 2,658 — 8,530 Account fees and other 2,812 9,633 881 11,033 159 24,518 Total revenues $ 220,947 $ 196,029 $ 155,726 $ 235,969 $ 6,737 $ 815,408 Primary Geographic Markets: United States $ 145,621 $ 196,029 $ 122,503 $ 219,580 $ 6,737 $ 690,470 United Kingdom 46,704 — 25,104 — — 71,808 Canada 20,127 — 3,029 — — 23,156 Ireland 8,495 — 4,795 16,389 — 29,679 Other — — 295 — — 295 Total revenues $ 220,947 $ 196,029 $ 155,726 $ 235,969 $ 6,737 $ 815,408

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Summary of Significant Accounting Policies [Line Items]
Cash and cash equivalents invested in SEI-sponsored money market funds	$ 780,928		$ 780,928		$ 784,626
Restricted cash	351		351		3,101
Capitalized software development costs			12,271	$ 12,533
Net book value of capitalized software	$ 256,473		$ 256,473		270,977
Anti-dilutive employee stock options (in shares)	11,530	8,154	11,623	7,781
Anti-dilutive employee stock options (in USD per share)	$ 57.77	$ 58.26	$ 57.77	$ 58.50
SEI Wealth Platform
Summary of Significant Accounting Policies [Line Items]
Capitalized software development costs			$ 12,172	$ 11,785
Net book value of capitalized software	$ 246,005		246,005
Capitalized software in progress	20,897		20,897		13,409
Amortization expense of capitalized software			$ 23,876	21,656
SEI Wealth Platform | Weighted Average
Summary of Significant Accounting Policies [Line Items]
Weighted average remaining life			10 years
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	313,481		$ 313,481		347,082
SEI Investments (Europe) Limited
Summary of Significant Accounting Policies [Line Items]
Restricted cash	250		250		3,000
SEI Investments Distribution Co. (SIDCO)
Summary of Significant Accounting Policies [Line Items]
Restricted cash	101		101		$ 101
SEI-Sponsored Open-Ended Money Market Mutual Funds
Summary of Significant Accounting Policies [Line Items]
Fees waived	$ 11,256	$ 9,714	$ 21,489	$ 16,355

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounting Policies [Abstract]
Net income	$ 133,778	$ 101,066	$ 263,248	$ 210,308
Shares used to compute basic earnings per common share (in shares)	142,074	147,478	142,638	148,473
Dilutive effect of stock options (in shares)	2,138	2,120	2,121	2,510
Shares used to compute diluted earnings per common share (in shares)	144,212	149,598	144,759	150,983
Basic earnings per common share (in USD per share)	$ 0.94	$ 0.69	$ 1.85	$ 1.42
Diluted earnings per common share (in USD per share)	$ 0.93	$ 0.68	$ 1.82	$ 1.39

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounting Policies [Abstract]
Net income	$ 133,778	$ 101,066	$ 263,248	$ 210,308
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	8,424	7,640	16,733	15,113
Amortization	14,723	13,140	29,075	26,217
Equity in earnings of unconsolidated affiliate	(35,065)	(28,276)	(68,415)	(58,183)
Distributions received from unconsolidated affiliate			68,064	73,241
Stock-based compensation	10,103	7,062	19,855	13,991
Provision for losses on receivables			2,088	(122)
Deferred income tax expense			(6,869)	(5,459)
Net (gain) loss from investments	$ (377)	$ (1,903)	(709)	2,086
Change in other long-term liabilities			987	(1,448)
Change in other assets			(976)	(6,135)
Contract costs capitalized, net of amortization			429	(2,117)
Other			929	(1,217)
Change in current assets and liabilities (Increase) decrease in
Receivables from investment products			(906)	4,292
Receivables			(26,437)	(11,134)
Other current assets			538	(2,716)
Advances due from unconsolidated affiliate			51,364	11,261
(Decrease) increase in
Accounts payable			1,525	6,357
Accrued liabilities			(25,721)	(9,367)
Deferred revenue			195	(836)
Total adjustments			61,749	53,824
Net cash provided by operating activities			$ 324,997	$ 264,132

Investment In Unconsolidated _3

Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Apr. 01, 2021	Mar. 31, 2021
Investments in and Advances to Affiliates [Line Items]
Distributions received from unconsolidated affiliate			$ 68,064	$ 73,241
Company's share in the earnings of equity method investee	$ 35,065	$ 28,276	68,415	58,183
LSV Asset Management
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage					38.70%	38.80%
Total investment in equity method investee	47,420		47,420
Distributions received from unconsolidated affiliate			68,064	73,241
Company's share in the earnings of equity method investee	$ 35,065	$ 28,276	$ 68,415	$ 58,183

Investment In Unconsolidated _4

Investment In Unconsolidated Affiliate (Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]
Revenues	$ 475,651	$ 400,646	$ 931,337	$ 815,408
Equity Method Investment, Nonconsolidated Investee | LSV Asset Management
Schedule of Equity Method Investments [Line Items]
Revenues	116,392	94,648	227,229	194,644
Net income	$ 90,520	$ 72,847	$ 176,440	$ 149,744

Investment in Unconsolidated _5

Investment in Unconsolidated Affiliate (Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Current assets	$ 1,311,356	$ 1,300,977
Total Assets	2,139,690	2,167,256
Current liabilities	232,899	317,275
Total Liabilities and Shareholders' Equity	2,139,690	2,167,256
Equity Method Investment, Nonconsolidated Investee | LSV Asset Management
Schedule of Equity Method Investments [Line Items]
Current assets	129,529	151,515
Non-current assets	4,023	4,296
Total Assets	133,552	155,811
Current liabilities	55,625	77,077
Non-current liabilities	4,249	4,620
Partners’ capital	73,678	74,114
Total Liabilities and Shareholders' Equity	$ 133,552	$ 155,811

Composition of Certain Financ_3

Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Items Included in Consolidated Statement of Financial Condition [Abstract]
Trade receivables	$ 99,140	$ 99,106
Fees earned, not billed	300,834	262,167
Other receivables	12,782	25,046
Receivables, Gross, Current	412,756	386,319
Less: Allowance for doubtful accounts	(3,188)	(1,100)
Receivables, net	$ 409,568	$ 385,219

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Property and Equipment [Line Items]
Property and Equipment, gross	$ 578,785		$ 578,785		$ 567,691
Less: Accumulated depreciation	(394,743)		(394,743)		(378,639)
Property and Equipment, net	184,042		184,042		189,052
Depreciation expense	8,424	$ 7,640	16,733	$ 15,113
Buildings
Property and Equipment [Line Items]
Property and Equipment, gross	210,053		210,053		206,151
Equipment
Property and Equipment [Line Items]
Property and Equipment, gross	147,224		147,224		141,820
Land
Property and Equipment [Line Items]
Property and Equipment, gross	24,344		24,344		24,179
Purchased software
Property and Equipment [Line Items]
Property and Equipment, gross	152,259		152,259		147,838
Furniture and fixtures
Property and Equipment [Line Items]
Property and Equipment, gross	21,535		21,535		21,439
Leasehold improvements
Property and Equipment [Line Items]
Property and Equipment, gross	22,246		22,246		21,604
Construction in progress
Property and Equipment [Line Items]
Property and Equipment, gross	$ 1,124		$ 1,124		$ 4,660

Composition of Certain Financ_5

Composition of Certain Financial Statement Captions (Deferred Contract Costs) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Items Included in Consolidated Statement of Financial Condition [Abstract]
Deferred contract costs	$ 33,352,000		$ 33,352,000		$ 33,781,000
Capitalized contract cost, amount capitalized during period	$ 1,674,000	$ 1,752,000	4,046,000	$ 4,749,000
Amortization of deferred contract costs			4,475,000	$ 2,632,000
Capitalized contract cost impairment			$ 0

Composition of Certain Financ_6

Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 65,355	$ 95,656
Accrued employee benefits and other personnel	15,073	18,770
Accrued consulting, outsourcing and professional fees	36,147	31,907
Accrued sub-advisory, distribution and other asset management fees	59,944	49,924
Accrued dividend payable	0	53,127
Other accrued liabilities	35,465	50,461
Total accrued liabilities	$ 211,984	$ 299,845

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-income securities owned	$ 26,174	$ 34,064
Assets, fair value	163,145	145,649
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	12,731	12,142
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-income securities owned	26,174	34,064
Assets, fair value	143,482	127,341
Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds sponsored by LSV	6,932	6,166
Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	12,731	12,142
Equity 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	12,731	12,142
Equity securities | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	0	0
Available-for-sale debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	117,308	93,277
Available-for-sale debt 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
Available-for-sale debt securities | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	$ 117,308	$ 93,277

Marketable Securities (Narrativ

Marketable Securities (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Schedule of Investments [Line Items]
Net unrealized gains (losses) of available-for-sale debt securities	$ 1,148,000		$ 1,148,000		$ 1,551,000
Unrealized gains (losses) during the period, income tax expense (benefit)	342,000		342,000		464,000
Available-for-sale securities, gross realized gains			0	$ 0
Mutual funds and equities, gross realized gains			613,000	196,000
Mutual funds and equities, gross realized loss			59,000	240,000
Other long-term investments	47,420,000		47,420,000		98,433,000
Securities owned	26,174,000		26,174,000		34,064,000
Cash Equivalents
Schedule of Investments [Line Items]
Cash equivalents at fair value	452,428,000		452,428,000		462,624,000
Available-for-sale debt securities
Schedule of Investments [Line Items]
Available-for-sale securities, gross realized losses			556,000	280,000
Investment Funds Sponsored by LSV
Schedule of Investments [Line Items]
Other long-term investments	6,932,000		6,932,000		$ 6,166,000
Unrealized gain (loss) on investments	$ 309,000	$ 996,000	$ 766,000	$ (1,239,000)

Marketable Securities (Investme

Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Available For Sale and Equity Securities, Cost	$ 127,647	$ 102,549
Available For Sale and Equity Securities, Gross Unrealized Gains	2,392	2,870
Available For Sale and Equity Securities, Gross Unrealized (Losses)	0	0
Available For Sale and Equity Securities, Fair Value	130,039	105,419
Available-for-sale debt securities
Debt Securities, Available-for-sale [Line Items]
Available for sale debt securities, Cost	115,818	91,262
Available for sale debt securities, Gross Unrealized Gains	1,490	2,015
Available for sale debt securities, Gross Unrealized (Losses)	0	0
Available for sale debt securities, Fair Value	117,308	93,277
SEI-sponsored mutual funds
Debt Securities, Available-for-sale [Line Items]
Equity securities, FV-NI, Cost	6,896	6,866
Equity securities, FV-NI, Gross Unrealized Gains	666	382
Equity securities, FV-NI, Gross Unrealized (Losses)	0	0
Equity securities, FV-NI, Fair Value	7,562	7,248
Equities and other mutual funds
Debt Securities, Available-for-sale [Line Items]
Equity securities, FV-NI, Cost	4,933	4,421
Equity securities, FV-NI, Gross Unrealized Gains	236	473
Equity securities, FV-NI, Gross Unrealized (Losses)	0	0
Equity securities, FV-NI, Fair Value	$ 5,169	$ 4,894

Line of Credit (Details)

Line of Credit (Details) - 2021 Credit Facility	Apr. 23, 2021USD ($)fiscalQuarter	Jun. 30, 2021USD ($)
Line of Credit Facility [Line Items]
Debt interest rate accrual term, number of preceding fiscal quarters | fiscalQuarter	4
Letters of credit outstanding amount		$ 5,808,000
Line of Credit
Line of Credit Facility [Line Items]
Credit facility term of agreement	5 years
Credit facility maximum borrowing capacity	$ 325,000,000
Credit facility stated percentage	0.00%
Credit facility accordion feature, increase limit	$ 100,000,000
Credit facility remaining borrowing capacity		$ 319,192,000
Line of Credit | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.00%
Line of Credit | Federal Funds Rate
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	0.50%
Line of Credit | Minimum
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion	0.15%
Line of Credit | Minimum | Lender's Base Rate Plus Market Spread
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	0.25%
Line of Credit | Minimum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.25%
Line of Credit | Maximum
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion	0.30%
Line of Credit | Maximum | Lender's Base Rate Plus Market Spread
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.00%
Line of Credit | 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	0.20%

Shareholders' Equity (Narrative

Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands	Jun. 02, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase (decrease) in stock-based compensation from change in management's estimate				$ 759,000
Unrecognized compensation cost		$ 86,667,000		86,667,000
Total intrinsic value of options exercised				23,814,000
Aggregate intrinsic value of options exercisable		$ 125,738,000		$ 125,738,000
Market value of Company's common stock (in USD per share)		$ 61.97		$ 61.97
Weighted average exercise price per share (in USD per share)		$ 40.35		$ 40.35
Total options outstanding (in shares)		17,345		17,345
Total options exercisable (in shares)		5,814		5,814
Dividends declared per common share (in USD per share)	$ 0.37	$ 0.37	$ 0.35	$ 0.37	$ 0.35
Cash dividends declared		$ 52,389,000	$ 51,462,000	$ 52,389,000	$ 51,462,000
Common Stock Buyback
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased and retired (in shares)				3,238
Company purchased, cost				$ 196,158,000
Additional authorized amount in the stock repurchase program	$ 250,000,000
Remaining stock repurchase authorization amount		$ 246,669,000		$ 246,669,000
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

Shareholders' Equity (Stock-Bas

Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 10,103	$ 7,062	$ 19,855	$ 13,991
Less: Deferred tax benefit	(1,904)	(1,318)	(3,758)	(2,703)
Stock-based compensation expense, net of tax	$ 8,199	$ 5,744	$ 16,097	$ 11,288

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,829,108	$ 1,734,266	$ 1,739,907	$ 1,738,778
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income before reclassifications			1,844
Amounts reclassified from accumulated other comprehensive loss			432
Total other comprehensive income (loss), net of tax	881	1,169	2,276	(10,675)
Ending balance	1,805,606	1,708,625	1,805,606	1,708,625
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(18,349)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income before reclassifications			2,679
Amounts reclassified from accumulated other comprehensive loss			0
Total other comprehensive income (loss), net of tax			2,679
Ending balance	(15,670)		(15,670)
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			1,551
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income before reclassifications			(835)
Amounts reclassified from accumulated other comprehensive loss			432
Total other comprehensive income (loss), net of tax			(403)
Ending balance	1,148		1,148
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(15,403)	(35,348)	(16,798)	(23,504)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Total other comprehensive income (loss), net of tax	881	1,169	2,276	(10,675)
Ending balance	$ (14,522)	$ (34,179)	$ (14,522)	$ (34,179)

Business Segment Information (N

Business Segment Information (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 475,651,000	$ 400,646,000	$ 931,337,000	$ 815,408,000
Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 475,651	$ 400,646	$ 931,337	$ 815,408
Expenses	317,308	282,943	618,641	569,494
Operating profit (loss)	158,343	117,703	312,696	245,914
Private Banks
Segment Reporting Information [Line Items]
Revenues	123,676	107,726	241,284	220,947
Expenses	117,654	107,723	228,378	218,376
Operating profit (loss)	6,022	3	12,906	2,571
Investment Advisors
Segment Reporting Information [Line Items]
Revenues	119,396	93,708	232,690	196,029
Expenses	59,133	50,149	114,160	102,581
Operating profit (loss)	60,263	43,559	118,530	93,448
Institutional Investors
Segment Reporting Information [Line Items]
Revenues	85,699	76,523	170,198	155,726
Expenses	41,895	36,937	81,053	75,204
Operating profit (loss)	43,804	39,586	89,145	80,522
Investment Managers
Segment Reporting Information [Line Items]
Revenues	142,808	119,340	279,227	235,969
Expenses	84,995	74,668	168,015	148,957
Operating profit (loss)	57,813	44,672	111,212	87,012
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues	4,072	3,349	7,938	6,737
Expenses	13,631	13,466	27,035	24,376
Operating profit (loss)	$ (9,559)	$ (10,117)	$ (19,097)	$ (17,639)

Business Segment Information (R

Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Total operating profit from segments	$ 158,343	$ 117,703	$ 312,696	$ 245,914
Income from operations	136,021	100,312	268,858	210,540
Operating Segments
Segment Reporting Information [Line Items]
Total operating profit from segments	158,343	117,703	312,696	245,914
Corporate
Segment Reporting Information [Line Items]
Corporate overhead expenses	$ (22,322)	$ (17,391)	$ (43,838)	$ (35,374)

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Capital Expenditures	$ 17,162	$ 19,855	$ 27,740	$ 46,975
Depreciation	8,424	7,640	16,733	15,113
Amortization	14,723	13,140	29,075	26,217
Operating Segments
Segment Reporting Information [Line Items]
Capital Expenditures	16,744	19,057	27,162	45,180
Depreciation	8,075	7,383	16,053	14,600
Amortization	14,598	13,082	28,892	26,102
Operating Segments | Private Banks
Segment Reporting Information [Line Items]
Capital Expenditures	8,594	6,634	14,423	16,559
Depreciation	4,178	3,965	8,310	7,847
Amortization	8,633	7,464	17,209	14,885
Operating Segments | Investment Advisors
Segment Reporting Information [Line Items]
Capital Expenditures	3,580	3,803	5,888	9,193
Depreciation	1,417	1,172	2,706	2,323
Amortization	2,909	2,664	5,536	5,316
Operating Segments | Institutional Investors
Segment Reporting Information [Line Items]
Capital Expenditures	884	1,029	1,395	2,387
Depreciation	353	301	711	603
Amortization	427	427	853	854
Operating Segments | Investment Managers
Segment Reporting Information [Line Items]
Capital Expenditures	3,373	7,259	5,004	16,291
Depreciation	2,027	1,869	4,080	3,681
Amortization	2,444	2,342	4,924	4,677
Operating Segments | Investments In New Businesses
Segment Reporting Information [Line Items]
Capital Expenditures	313	332	452	750
Depreciation	100	76	246	146
Amortization	185	185	370	370
Corporate
Segment Reporting Information [Line Items]
Capital Expenditures	418	798	578	1,795
Depreciation	349	257	680	513
Amortization	$ 125	$ 58	$ 183	$ 115

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 16,850	$ 15,911
Unrecognized tax benefits that would affect effective tax rate	16,799	15,761
Interest and penalties on unrecognized benefits	2,250	$ 2,105
Settlement and Lapse of Statute
Income Tax Contingency [Line Items]
Unrecognized tax benefits within the next twelve months	$ 6,053

Income Taxes (Interest And Pena

Income Taxes (Interest And Penalties) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 16,850	$ 15,911
Interest and penalties on unrecognized benefits	2,250	2,105
Total gross uncertain tax positions	19,100	18,016
Amount included in Current liabilities	6,053	6,546
Amount included in Other long-term liabilities	$ 13,047	$ 11,470

Income Taxes (Effective Income

Income Taxes (Effective Income Tax Rate Reconciliation) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Statutory rate	21.00%	21.00%	21.00%	21.00%
State taxes, net of federal tax benefit	3.20%	3.30%	3.20%	3.20%
Foreign tax expense and tax rate differential	(0.10%)	(0.20%)	(0.10%)	(0.10%)
Tax benefit from stock option exercises	(1.20%)	(0.40%)	(1.20%)	(1.30%)
Other, net	(0.60%)	(0.40%)	(0.40%)	(0.40%)
Effective income tax rate	22.30%	23.30%	22.50%	22.40%

Commitments and Contingencies (

Commitments and Contingencies (Details)	Jun. 30, 2021lawsuit
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

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Apr. 30, 2018	Jul. 31, 2017
Goodwill [Line Items]
Goodwill	$ 64,489,000		$ 64,489,000
Payment of contingent consideration	3,965,000	$ 633,000
Goodwill change during period	0
Amortization expense	1,842,000	1,842,000
Huntington Steele, LLC
Goodwill [Line Items]
Goodwill				$ 11,499,000
Payment of contingent consideration	3,965,000	$ 633,000
Contingent consideration, current	765,000
Contingent consideration, long-term	$ 7,994,000
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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 475,651	$ 400,646	$ 931,337	$ 815,408
United States
Disaggregation of Revenue [Line Items]
Revenues	402,756	340,215	788,747	690,470
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	42,117	34,625	82,511	71,808
Canada
Disaggregation of Revenue [Line Items]
Revenues	13,350	11,157	26,134	23,156
Ireland
Disaggregation of Revenue [Line Items]
Revenues	17,300	14,516	33,688	29,679
Other
Disaggregation of Revenue [Line Items]
Revenues	128	133	257	295
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	122,725	105,963	242,419	222,856
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	113,851	92,669	222,367	189,109
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	132,664	109,516	258,194	216,192
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	55,746	44,191	106,622	90,344
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	32,297	31,439	63,813	63,859
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	4,795	4,541	10,349	8,530
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	13,573	12,327	27,573	24,518
Private Banks
Disaggregation of Revenue [Line Items]
Revenues	123,676	107,726	241,284	220,947
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues	78,848	71,607	153,943	145,621
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	28,082	22,345	54,747	46,704
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues	12,152	9,726	23,634	20,127
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues	4,594	4,048	8,960	8,495
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	33,708	30,307	66,272	63,151
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	603	292	1,076	639
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	402	438	771	913
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	55,746	44,191	106,622	90,344
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	28,442	28,047	56,252	57,216
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	3,928	3,157	8,335	5,872
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	847	1,294	1,956	2,812
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues	119,396	93,708	232,690	196,029
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues	119,396	93,708	232,690	196,029
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	75,039	62,251	147,693	132,431
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	38,345	26,545	73,059	53,965
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	6,012	4,912	11,938	9,633
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues	85,699	76,523	170,198	155,726
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues	67,792	60,414	134,512	122,503
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	14,035	12,280	27,764	25,104
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues	1,198	1,431	2,500	3,029
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	2,546	2,265	5,165	4,795
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues	128	133	257	295
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	13,638	12,894	27,726	26,211
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	71,342	62,924	141,285	128,634
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	719	705	1,187	881
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues	142,808	119,340	279,227	235,969
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues	132,648	111,137	259,664	219,580
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	10,160	8,203	19,563	16,389
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	14	163	73	356
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	132,262	109,078	257,423	215,279
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	3,855	3,392	7,561	6,643
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	867	1,384	2,014	2,658
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	5,810	5,323	12,156	11,033
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues	4,072	3,349	7,938	6,737
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues	4,072	3,349	7,938	6,737
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	326	348	655	707
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	3,561	2,908	6,947	5,871
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	$ 185	$ 93	$ 336	$ 159