SEI Investments (SEIC) 10-Q 25 Apr 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 18, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	SEI INVESTMENTS COMPANY
Entity Central Index Key	0000350894
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	SEIC
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		152,520,183

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 669,323	$ 754,525
Restricted cash	3,517	3,514
Receivables from investment products	52,562	49,869
Receivables, net of allowance for doubtful accounts of $633 and $718	333,724	315,336
Securities owned	33,433	30,892
Other current assets	35,049	36,676
Total Current Assets	1,127,608	1,190,812
Property and Equipment, net of accumulated depreciation of $345,129 and $338,206	146,753	145,863
Operating Lease Right-of-Use Assets	45,297
Capitalized Software, net of accumulated amortization of $406,871 and $395,171	307,736	309,500
Investments Available for Sale	109,824	111,901
Investments in Affiliated Funds, at fair value	5,339	4,887
Investment in Unconsolidated Affiliate	56,422	52,342
Goodwill	64,489	64,489
Intangible Assets, net of accumulated amortization of $6,011 and $5,090	30,749	31,670
Deferred Contract Costs	24,145	24,007
Deferred Income Taxes	1,877	2,042
Other Assets, net	32,882	34,155
Total Assets	1,953,121	1,971,668
Current Liabilities:
Accounts payable	5,242	10,920
Accrued liabilities	173,860	279,634
Short-term operating lease liabilities	8,448
Deferred revenue	4,979	5,154
Total Current Liabilities	192,529	295,708
Long-term Income Taxes Payable	803	803
Deferred Income Taxes	56,909	57,795
Long-term Operating Lease Liabilities	41,838
Other Long-term Liabilities	24,492	24,215
Total Liabilities	316,571	378,521
Commitments and Contingencies
Shareholders' Equity:
Common stock, $.01 par value, 750,000 shares authorized; 152,276 and 153,634 shares issued and outstanding	1,523	1,536
Capital in excess of par value	1,111,366	1,106,641
Retained earnings	552,381	517,970
Accumulated other comprehensive loss, net	(28,720)	(33,000)
Total Shareholders' Equity	1,636,550	1,593,147
Total Liabilities and Shareholders' Equity	$ 1,953,121	$ 1,971,668

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Receivables, allowance for doubtful accounts	$ 633	$ 718
Property and Equipment, accumulated depreciation	345,129	338,206
Capitalized software, accumulated amortization	406,871	395,171
Intangible assets, accumulated amortization	$ 6,011	$ 5,090
Stockholders' Equity:
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	152,276,000	153,634,000
Common stock, shares outstanding	152,276,000	153,634,000

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Revenues	$ 400,820	$ 405,598
Expenses:
Subadvisory, distribution and other asset management costs	43,805	45,205
Software royalties and other information processing costs	8,128	8,718
Compensation, benefits and other personnel	130,335	124,277
Stock-based compensation	5,038	5,195
Consulting, outsourcing and professional fees	50,206	48,707
Data processing and computer related	20,992	20,591
Facilities, supplies and other costs	18,745	17,613
Amortization	12,679	11,854
Depreciation	7,331	7,122
Total expenses	297,259	289,282
Income from operations	103,561	116,316
Net gain (loss) from investments	1,279	(410)
Interest and dividend income	4,257	2,502
Interest expense	(157)	(257)
Equity in earnings of unconsolidated affiliate	37,317	40,607
Income before income taxes	146,257	158,758
Income taxes	32,276	18,920
Net income	$ 113,981	$ 139,838
Basic earnings per common share (in USD per share)	$ 0.74	$ 0.89
Shares used to compute basic earnings per share (in shares)	153,310	157,434
Diluted earnings per common share (in USD per share)	$ 0.73	$ 0.86
Shares used to compute diluted earnings per share (in shares)	156,541	163,424
Asset management, administration and distribution fees
Revenues:
Revenues	$ 313,944	$ 316,209
Information processing and software servicing fees
Revenues:
Revenues	$ 86,876	$ 89,389

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 113,981	$ 139,838
Other comprehensive gain, net of tax:
Foreign currency translation adjustments	3,397	3,377
Unrealized gain (loss) on investments:
Unrealized gains (losses) during the period, net of income taxes of $(240) and $424	797	(1,357)
Less: reclassification adjustment for losses (gains) realized in net income, net of income taxes of $(24) and $(15)	86	(273)
Unrealized gain (loss) on investments:	883	(1,630)
Total other comprehensive gain, net of tax	4,280	1,747
Comprehensive income	$ 118,261	$ 141,585

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) during the period, income tax	$ (240)	$ 424
Reclassification adjustment for losses realized in net income, income tax	$ (24)	$ (15)

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Capital In Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect upon adoption of ASC 606	$ 14,402			$ 14,402
Beginning balance at Dec. 31, 2017	1,476,839	$ 1,571	$ 1,027,709	467,467	$ (19,908)
Beginning balance, shares at Dec. 31, 2017		157,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	139,838			139,838
Other comprehensive gain	1,747				1,747
Purchase and retirement of common stock	(82,256)	$ (11)	(5,461)	(76,784)
Purchase and retirement of common stock, shares		(1,122)
Issuance of common stock under employee stock purchase plan	1,005	$ 0	1,005
Issuance of common stock under the employee stock purchase plan, shares		16
Issuance of common stock upon exercise of stock options	56,884	$ 20	56,864
Issuance of common stock upon exercise of stock options, shares		2,027
Stock-based compensation	5,195		5,195
Ending balance at Mar. 31, 2018	1,613,654	$ 1,580	1,085,312	544,923	(18,161)
Ending balance, shares at Mar. 31, 2018		157,990
Beginning balance at Dec. 31, 2018	$ 1,593,147	$ 1,536	1,106,641	517,970	(33,000)
Beginning balance, shares at Dec. 31, 2018	153,634	153,634
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 113,981			113,981
Other comprehensive gain	4,280				4,280
Purchase and retirement of common stock	(88,789)	$ (17)	(9,202)	(79,570)
Purchase and retirement of common stock, shares		(1,725)
Issuance of common stock under employee stock purchase plan	1,322	$ 0	1,322
Issuance of common stock under the employee stock purchase plan, shares		32
Issuance of common stock upon exercise of stock options	7,571	$ 4	7,567
Issuance of common stock upon exercise of stock options, shares		335
Stock-based compensation	5,038		5,038
Ending balance at Mar. 31, 2019	$ 1,636,550	$ 1,523	$ 1,111,366	$ 552,381	$ (28,720)
Ending balance, shares at Mar. 31, 2019	152,276	152,276

Consolidated Condensed Statemen

Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 113,981	$ 139,838
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1)	(54,082)	(35,664)
Net cash provided by operating activities	59,899	104,174
Cash flows from investing activities:
Additions to property and equipment	(7,317)	(5,611)
Additions to capitalized software	(9,937)	(12,887)
Purchases of marketable securities	(43,672)	(15,466)
Prepayments and maturities of marketable securities	45,200	18,588
Net cash used in investing activities	(15,726)	(15,376)
Cash flows from financing activities:
Repayments under revolving credit facility	0	(10,000)
Purchase and retirement of common stock	(90,777)	(87,995)
Proceeds from issuance of common stock	8,893	57,889
Payment of dividends	(50,760)	(47,179)
Net cash used in financing activities	(132,644)	(87,285)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	3,272	2,541
Net (decrease) increase in cash, cash equivalents and restricted cash	(85,199)	4,054
Cash, cash equivalents and restricted cash, beginning of period	758,039	747,752
Cash, cash equivalents and restricted cash, end of period	672,840	751,806
Non-cash operating activities:
Operating lease right-of-use assets and lease liabilities recorded upon adoption of ASC 842	$ 44,169	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Operations SEI Investments Company (the Company), a Pennsylvania corporation, provides investment processing, investment management, and investment operations platforms to financial institutions, financial advisors, institutional investors, investment managers and ultra-high-net-worth families in the United States, Canada, the United Kingdom, continental Europe and various other locations throughout the world. Investment processing platforms consist of application and business process outsourcing services, professional services and transaction-based services. Revenues from investment processing platforms are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Investment management programs consist of mutual funds, alternative investments and separate accounts. These include a series of money market, equity, fixed-income and alternative investment portfolios, primarily in the form of registered investment companies. The Company serves as the administrator and investment advisor for many of these products. Revenues from investment management programs are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment operations platforms consist of outsourcing services including fund and investment accounting, administration, reconciliation, investor servicing and client reporting. Revenues from investment operations platforms are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Basis of Presentation The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America. Certain financial information and accompanying note disclosure normally included in the Company’s Annual Report on Form 10-K have been condensed or omitted. The interim financial information is unaudited but reflects all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of financial position of the Company as of March 31, 2019 , the results of operations for the three months ended March 31, 2019 and 2018 , and cash flows for the three -month periods ended March 31, 2019 and 2018 . These interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 . The Company adopted the requirements of the Accounting Standards Update (ASU) No. 2016-2 Leases (Topic 842) (Accounting Standards Codifications (ASC) 842 (ASC 842)) using the modified retrospective method during the three months ended March 31, 2019 . As a result of the adoption of ASC 842, the Company recorded additional lease assets and net lease liabilities of $44,169 as of January 1, 2019. Upon implementation, the Company elected the package of practical expedients permitted under the transition guidance within the new standard which allowed the Company to carryforward the historical lease identification, classification and initial direct cost. ASC 842 did not materially impact the Company’s consolidated net income or consolidated cash flows (see following caption "Leases"). With the exception of the adoption of ASC 842, there have been no significant changes in significant accounting policies during the three months ended March 31, 2019 as compared to the significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2018 . Variable Interest Entities The Company or its affiliates have created numerous investment products for its clients in various types of legal entity structures. The Company serves as the Manager, Administrator and Distributor for these investment products and may also serve as the Trustee for some of the investment products. The Company receives asset management, distribution, administration and custodial fees for these services. Clients are the equity investors and participate in proportion to their ownership percentage in the net income or loss and net capital gains or losses of the products, and, on liquidation, will participate in proportion to their ownership percentage in the remaining net assets of the products after satisfaction of outstanding liabilities. The Company has concluded that it is not the primary beneficiary of the entities and; therefore, is not required to consolidate any of the pooled investment vehicles for which it receives asset management, distribution, administration and custodial fees under the VIE model. The entities either do not meet the definition of a VIE or the Company does not hold a variable interest in the entities. The entities either qualify for the money market scope exception, or are entities in which the Company’s asset management, distribution, administration and custodial fees are commensurate with the services provided and include fair terms and conditions, or are entities that are limited partnerships which have substantive kick-out rights. The Company acts as a fiduciary and does not hold any other interests other than insignificant seed money investments in the pooled investment vehicles. For this reason, the Company also concluded that it is not required to consolidate the pooled investment vehicles under the voting interest entity (VOE) model. The Company is a party to expense limitation agreements with certain SEI-sponsored money market funds subject to Rule 2a-7 of the Investment Company Act of 1940 which establish a maximum level of ordinary operating expenses incurred by the fund in any fiscal year including, but not limited to, fees of the administrator or its affiliates. Under the terms of these agreements, the Company waived $7,905 and $6,654 in fees during the three months ended March 31, 2019 and 2018 , respectively. Revenue Recognition Revenue is recognized when the transfer of control of promised goods or services under the terms of a contract with customers are satisfied in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those promised goods or services. Certain portions of the Company’s revenues involve a third party in providing goods or services to its customers. In such circumstances, the Company must determine whether the nature of its promise to the customer is to provide the underlying goods or services (the Company is the principal in the transaction and reports the transaction gross) or to arrange for a third party to provide the underlying goods or services (the entity is the agent in the transaction and reports the transaction net). Cash and Cash Equivalents Cash and cash equivalents includes $269,591 and $315,840 at March 31, 2019 and December 31, 2018 , respectively, primarily invested in SEI-sponsored open-ended money market mutual funds. The SEI-sponsored mutual funds are Level 1 assets. Restricted Cash Restricted cash includes $3,000 at March 31, 2019 and December 31, 2018 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $517 and $514 at March 31, 2019 and December 31, 2018 , respectively, segregated in special reserve accounts for the benefit of customers of the Company’s broker-dealer subsidiary, SEI Investments Distribution Co. (SIDCO), in accordance with certain rules established by the Securities and Exchange Commission (SEC) for broker-dealers. Capitalized Software The Company capitalized $9,937 and $12,887 of software development costs during the three months ended March 31, 2019 and 2018 , respectively. The Company's software development costs primarily relate to the continued development of the SEI Wealth Platform SM (SWP). The Company capitalized $9,739 and $12,042 of software development costs for significant enhancements to SWP during the three months ended March 31, 2019 and 2018 , respectively. As of March 31, 2019 , the net book value of SWP was $288,006 . The net book value includes $45,180 of capitalized software development costs in-progress associated with future releases. SWP has a weighted average remaining life of 8.5 years . Amortization expense for SWP was $10,399 and $9,719 during the three months ended March 31, 2019 and 2018 , respectively. Earnings per Share The calculations of basic and diluted earnings per share for the three months ended March 31, 2019 and 2018 are: Three Months Ended March 31, 2019 2018 Net income $ 113,981 $ 139,838 Shares used to compute basic earnings per common share 153,310,000 157,434,000 Dilutive effect of stock options 3,231,000 5,990,000 Shares used to compute diluted earnings per common share 156,541,000 163,424,000 Basic earnings per common share $ 0.74 $ 0.89 Diluted earnings per common share $ 0.73 $ 0.86 During the three months ended March 31 , 2019 and 2018 , employee stock options to purchase 6,323,000 and 6,054,000 shares of common stock with an average exercise price of $54.81 and $52.73 , respectively, were outstanding but not included in the computation of diluted earnings per common share. These options for the three month periods were not included in the computation of diluted earnings per common share because either the performance conditions have not been satisfied or would not have been satisfied if the reporting date was the end of the contingency period or the options' exercise price was greater than the average market price of the Company’s common stock and the effect on diluted earnings per common share would have been anti-dilutive. Leases The Company determines if an arrangement is a lease at the inception of the contract. The Company's operating leases are included in Operating lease right-of-use (ROU) assets, Short-term operating lease liabilities, and Long-term operating lease liabilities on the accompanying Consolidated Balance Sheet. The operating lease ROU assets and operating lease liabilities are recognized based on the present value of future minimum lease payments over the lease term at commencement date. As most of the Company’s leases do not provide an implicit interest rate, the Company utilizes an estimated incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. In determining the discount rate used in the present value calculation, the Company has elected to apply the portfolio approach for leases of equipment provided the leases commenced at or around the same time. This election allows the Company to account for leases at a portfolio level provided that the resulting accounting at this level would not differ materially from the accounting at the individual lease level. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company has elected to account for lease and non-lease components separately. Operating lease ROU assets include all contractual lease payments and initial direct costs incurred less any lease incentives. Facility leases generally only contain lease expense and non-component items such as taxes and pass through charges. Only the lease components are included in the ROU assets and lease liabilities. Additionally, the Company has elected not to apply the recognition requirements of ASC 842 to leases which have a lease term of less than one year at the commencement date. The majority of the Company's leases for corporate facilities and equipment contain terms for renewal and extension of the lease agreement. The exercise of lease renewal options is generally at the Company’s sole discretion. The Company includes the lease extensions when it is reasonably certain the Company will exercise the extension. The Company’s lease agreements do not contain any material variable lease payments, material residual value guarantees or any material restrictive covenants. The Company does not currently have any finance leases. See Note 15 for information on related disclosures regarding leases. Reclassifications Certain prior year amounts have been reclassified to conform to current year presentation. New Accounting Pronouncements In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13) which requires that expected credit losses relating to financial assets measured on an amortized cost basis and available-for-sale debt securities be recorded through an allowance for credit losses. ASU 2016-13 limits the amount of credit losses to be recognized for available-for-sale debt securities to the amount by which carrying value exceeds fair value and also requires the reversal of previously recognized credit losses if fair value increases. ASU 2016-13 becomes effective for the Company during the first quarter of 2020. Early adoption is permitted. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment (ASU 2017-04). The objective of ASU 2017-04 is to simplify the subsequent measurement of goodwill by entities performing their annual goodwill impairment tests by comparing the fair value of a reporting unit, including income tax effects from any tax-deductible goodwill, with its carrying amount and recognizing an impairment charge for the amount by which the carrying amount exceeds fair value. ASU 2017-04 is effective for the Company beginning in the first quarter of 2020. Early adoption is permitted. The Company is currently evaluating the impact of adopting ASU 2017-04 on its consolidated financial statements and related disclosures. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement (ASU 2018-13) which modifies the disclosure requirements on fair value measurements. ASU 2018-13 is effective for the Company beginning in the first quarter of 2020. The Company is currently evaluating the impact of adopting ASU 2018-13 on its consolidated financial statements and related disclosures. In October 2018, the FASB issued ASU 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities (ASU 2018-17). The new standard changes how entities evaluate decision-making fees under the variable interest entity guidance. ASU 2018-17 is effective for the Company beginning in the first quarter of 2020. The Company is currently evaluating the impact of adopting ASU 2018-17 on its consolidated financial statements and related disclosures. 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 three months ended March 31 : 2019 2018 Net income $ 113,981 $ 139,838 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 7,331 7,122 Amortization 12,679 11,854 Equity in earnings of unconsolidated affiliate (37,317 ) (40,607 ) Distributions received from unconsolidated affiliate 33,237 45,617 Stock-based compensation 5,038 5,195 Provision for losses on receivables (85 ) 93 Deferred income tax expense (984 ) 2,083 Net (gain) loss from investments (1,279 ) 410 Change in other long-term liabilities 277 579 Change in other assets 1,334 290 Contract costs capitalized, net of amortization (138 ) (1,234 ) Other (63 ) 450 Change in current assets and liabilities (Increase) decrease in Receivables from investment products (2,693 ) 1,757 Receivables (18,304 ) (25,657 ) Other current assets 574 (3,564 ) (Decrease) increase in Accounts payable (5,678 ) 3,195 Accrued liabilities (47,836 ) (43,522 ) Deferred revenue (175 ) 275 Total adjustments (54,082 ) (35,664 ) Net cash provided by operating activities $ 59,899 $ 104,174

Investment In Unconsolidated Af

Investment In Unconsolidated Affiliate	3 Months Ended
	Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Investment In Unconsolidated Affiliate	Investment in Unconsolidated Affiliate LSV Asset Management The Company has an investment in LSV Asset Management (LSV), a registered investment advisor that provides investment advisory services primarily to institutions, including pension plans and investment companies. LSV is currently an investment sub-advisor for a limited number of SEI-sponsored investment products. The Company's partnership interest in LSV as of March 31, 2019 was 38.9 percent . The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations. At March 31, 2019 , the Company’s total investment in LSV was $56,422 . The Company receives partnership distributions from LSV on a quarterly basis. The Company received partnership distributions from LSV of $33,237 and $45,617 in the three months ended March 31 , 2019 and 2018 , respectively. As such, the Company considers these distribution payments as returns on investment rather than returns of the Company's original investment in LSV and has therefore classified the associated cash inflows as an operating activity on the Consolidated Statements of Cash Flows. The Company’s proportionate share in the earnings of LSV was $37,317 and $40,607 during the three months ended March 31 , 2019 and 2018 , respectively. These tables contain condensed financial information of LSV: Condensed Statement of Operations Three Months Ended March 31, 2019 2018 Revenues $ 120,915 $ 131,718 Net income 95,948 104,406 Condensed Balance Sheets March 31, 2019 December 31, 2018 Current assets $ 148,489 $ 138,083 Non-current assets 5,047 1,165 Total assets $ 153,536 $ 139,248 Current liabilities $ 47,557 $ 47,874 Non-current liabilities 5,019 — Partners’ capital 100,960 91,374 Total liabilities and partners’ capital $ 153,536 $ 139,248

Composition of Certain Financia

Composition of Certain Financial Statement Captions	3 Months Ended
	Mar. 31, 2019
Items Included in Consolidated Statement of Financial Condition [Abstract]
Composition of Certain Financial Statement Captions	Composition of Certain Financial Statement Captions Receivables Receivables on the accompanying Consolidated Balance Sheets consist of: March 31, 2019 December 31, 2018 Trade receivables $ 83,594 $ 76,362 Fees earned, not billed 237,478 226,001 Other receivables 13,285 13,691 334,357 316,054 Less: Allowance for doubtful accounts (633 ) (718 ) $ 333,724 $ 315,336 Fees earned, not billed represents receivables from contracts with customers earned but unbilled and results from timing differences between services provided and contractual billing schedules. These billing schedules generally provide for fees to be billed on a quarterly basis. In addition, certain fees earned from investment operations services are calculated based on assets under administration that have an extended valuation process. Billings to these clients occur once the asset valuation processes are completed. Receivables from investment products on the accompanying Consolidated Balance Sheets primarily represent fees receivable for distribution, investment advisory, and administration services to various regulated investment companies and other investment products sponsored by SEI. Property and Equipment Property and Equipment on the accompanying Consolidated Balance Sheets consists of: March 31, 2019 December 31, 2018 Buildings $ 160,830 $ 160,796 Equipment 128,154 126,954 Land 10,772 10,772 Purchased software 139,794 139,245 Furniture and fixtures 18,312 18,103 Leasehold improvements 20,136 18,959 Construction in progress 13,884 9,240 491,882 484,069 Less: Accumulated depreciation (345,129 ) (338,206 ) Property and Equipment, net $ 146,753 $ 145,863 The Company recognized $7,331 and $7,122 in depreciation expense related to property and equipment for the three months ended March 31 , 2019 and 2018 , respectively. Deferred Contract Costs Deferred contract costs, which primarily consist of deferred sales commissions, were $24,145 and $24,007 as of March 31, 2019 and December 31, 2018 , respectively. The Company deferred expenses related to contract costs of $1,126 and $1,816 during the three months ended March 31, 2019 and 2018 , respectively. Amortization expense related to deferred contract costs were $988 and $582 during the three months ended March 31, 2019 and 2018 , respectively. There was no impairment loss in relation to deferred contract costs during the three months ended March 31, 2019 . Accrued Liabilities Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: March 31, 2019 December 31, 2018 Accrued employee compensation $ 31,825 $ 97,603 Accrued consulting, outsourcing and professional fees 33,031 31,000 Accrued sub-advisory, distribution and other asset management fees 42,616 42,583 Accrued dividend payable — 50,761 Accrued income taxes 28,464 6,559 Other accrued liabilities 37,924 51,128 Total accrued liabilities $ 173,860 $ 279,634

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The fair value of the Company’s financial assets and liabilities, except for the Company's investment funds sponsored by LSV, is determined in accordance with the fair value hierarchy. The fair value of the Company’s Level 1 financial assets consist mainly of investments in open-ended mutual funds that are quoted daily. Level 2 financial assets consist of Government National Mortgage Association (GNMA) mortgage-backed securities held by the Company's wholly-owned limited purpose federal thrift subsidiary, SEI Private Trust Company (SPTC), Federal Home Loan Bank (FHLB) and other U.S. government agency short-term notes held by SIDCO. The financial assets held by SIDCO were purchased as part of a cash management program requiring only short term, top-tier investment grade government and corporate securities. The financial assets held by SPTC are debt securities issued by GNMA and are backed by the full faith and credit of the U.S. government. These securities were purchased for the sole purpose of satisfying applicable regulatory requirements and have maturity dates which range from 2021 to 2041 . The fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets. The valuation of the Company's Level 2 financial assets held by SIDCO and SPTC are based upon securities pricing policies and procedures utilized by third-party pricing vendors. The pricing policies and procedures applied for our Level 1 and Level 2 financial assets during the three months ended March 31 , 2019 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2018 . The Company had no Level 3 financial assets at March 31, 2019 or December 31, 2018 that were required to be measured at fair value on a recurring basis. The Company's Level 3 financial liabilities at March 31, 2019 and December 31, 2018 consist entirely of the estimated contingent consideration of $12,120 resulting from an acquisition (See Note 12 ). The fair value of the contingent consideration was determined using a Monte-Carlo simulation model. Key assumptions for the Monte-Carlo simulation model include expected revenues, expected volatility, risk-free rate and correlation coefficient. There were no transfers of financial assets between levels within the fair value hierarchy during the three months ended March 31 , 2019 . The fair value of certain financial assets of the Company was determined using the following inputs: Fair Value Measurements at the End of the Reporting Period Using Assets March 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 11,111 $ 11,111 $ — Fixed-income available-for-sale securities 98,713 — 98,713 Fixed-income securities owned 33,433 — 33,433 Investment funds sponsored by LSV (1) 5,339 $ 148,596 $ 11,111 $ 132,146 Fair Value Measurements at the End of the Reporting Period Using Assets December 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 10,218 $ 10,218 $ — Fixed-income available-for-sale securities 101,683 — 101,683 Fixed-income securities owned 30,892 — 30,892 Investment funds sponsored by LSV (1) 4,887 $ 147,680 $ 10,218 $ 132,575 (1) The fair value amounts presented in the tables above are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the accompanying Consolidated Balance Sheets (See Note 5

Marketable Securities

Marketable Securities	3 Months Ended
	Mar. 31, 2019
Marketable Securities [Abstract]
Marketable Securities	Marketable Securities Investments Available for Sale Investments available for sale classified as non-current assets consist of: At March 31, 2019 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,429 $ 77 $ (384 ) $ 7,122 Equities and other mutual funds 3,475 514 — 3,989 Debt securities 99,401 — (688 ) 98,713 $ 110,305 $ 591 $ (1,072 ) $ 109,824 At December 31, 2018 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,446 $ — $ (788 ) $ 6,658 Equities and other mutual funds 3,434 126 — 3,560 Debt securities 103,518 — (1,835 ) 101,683 $ 114,398 $ 126 $ (2,623 ) $ 111,901 Net unrealized losses at March 31, 2019 and December 31, 2018 of the Company's available-for-sale debt securities were $530 (net of income tax benefit of $158 ) and $1,413 (net of income tax benefit of $422 ), respectively. These net unrealized losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets. There were gross realized gains of $458 and gross realized losses of $182 during the three months ended March 31 , 2018 . Gross realized gains and losses from available-for-sale securities during the three months ended March 31 , 2019 were immaterial. Gains and losses from available-for-sale securities, including amounts reclassified from accumulated comprehensive loss, are reflected in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations. Investments in Affiliated Funds The Company has an investment in funds sponsored by LSV. The Company records this investment on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these funds are recognized in Net (loss) gain from investments on the accompanying Consolidated Statements of Operations. The investment primarily consists of U.S. dollar denominated funds that invest primarily in securities of Canadian, Australian and Japanese companies as well as various other global securities. The underlying securities held by the funds are translated into U.S. dollars within the funds. The funds had a fair value of $5,339 and $4,887 at March 31, 2019 and December 31, 2018 , respectively. The Company recognized gains of $452 and losses of $500 during the three months ended March 31, 2019 and 2018 , respectively, from the change in fair value of the funds. Securities Owned The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings. The securities had a fair value of $33,433 and $30,892 at March 31, 2019 and December 31, 2018 , respectively. There were no material net gains or losses related to the securities during the three months ended March 31, 2019 and 2018

Line of Credit

Line of Credit	3 Months Ended
	Mar. 31, 2019
Line of Credit Facility [Abstract]
Line of Credit	Line of Credit The Company has a five-year $300,000 Credit Agreement (the Credit Facility) with Wells Fargo Bank, National Association, and a syndicate of other lenders. The Credit Facility is scheduled to expire in June 2021, at which time any aggregate principal amount of loans outstanding becomes payable in full. Any borrowings made under the Credit Facility will accrue interest at rates that, at the Company's option, are based on a base rate (the Base Rate) plus a premium that can range from 0.25 percent to 1.00 percent or the London InterBank Offered Rate (LIBOR) plus a premium that can range from 1.25 percent to 2.00 percent depending on the Company’s Leverage Ratio (a ratio of consolidated indebtedness to consolidated EBITDA for the four preceding fiscal quarters, all as defined in the related agreement). The Base Rate is defined as the highest of a) the Federal Funds Rate, as published by the Federal Reserve Bank of New York, plus 0.50 percent , b) the prime commercial lending rate of Wells Fargo, c) the applicable LIBOR plus 1.00 percent , or d) 0 percent . The Company also pays quarterly commitment fees based on the unused portion of the Credit Facility. The quarterly fees for the Credit Facility can range from 0.15 percent of the amount of the unused portion to 0.30 percent , depending on the Company’s Leverage Ratio. Certain wholly-owned subsidiaries of the Company have guaranteed the obligations of the Company under the agreement. The aggregate amount of the Credit Facility may be increased by an additional $100,000 under certain conditions set forth in the agreement. The Company may issue up to $15,000 in letters of credit under the terms of the Credit Facility. The Company pays a periodic commission fee of 1.25 percent plus a fronting fee of 0.175 percent of the aggregate face amount of the outstanding letters of credit issued under the Credit Facility. The Credit Facility contains covenants that restrict the ability of the Company to engage in mergers, consolidations, asset sales, investments, transactions with affiliates, or to incur liens, as defined in the agreement. In the event of a default under the Credit Facility, the Company would also be restricted from paying dividends on, or repurchasing, its common stock without the approval of the lenders. None of the covenants of the Credit Facility negatively affect the Company’s liquidity or capital resources. Upon the occurrence of certain financial or economic events, significant corporate events, or certain other events of default constituting an event of default under the Credit Facility, all loans outstanding may be declared immediately due and payable and all commitments under the agreement may be terminated. As of March 31, 2019 , the Company had outstanding letters of credit of $13,813 under the Credit Facility. These letters of credit were issued primarily for the expansion of the Company's headquarters and are scheduled to expire during the remainder of 2019. The amount of the Credit Facility that is available for general corporate purposes as of March 31, 2019 was $286,187 . The Company was in compliance with all covenants of the Credit Facility during the three months ended March 31, 2019

Shareholders' Equity

Shareholders' Equity	3 Months Ended
	Mar. 31, 2019
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity Stock-Based Compensation The Company has only non-qualified stock options outstanding under its equity compensation plans. All outstanding stock options have performance-based vesting provisions specific to each option grant that tie the vesting of the applicable stock options to the Company’s financial performance. The Company’s stock options vest at a rate of 50 percent when a specified diluted earnings per share target is achieved, and the remaining 50 percent when a second, higher specified diluted earnings per share target is achieved. Options do not vest due to the passage of time but solely as a result of achievement of the financial vesting targets. Options granted in December 2017 and thereafter include a service condition which requires a minimum two or four year waiting period from the grant date along with the attainment of the applicable financial vesting target. Earnings per share targets exclude the impact of stock-based compensation and are established at time of grant. The targets are measured annually on December 31. The amount of stock-based compensation expense recognized in the period is based upon management’s estimate of when the earnings per share targets may be achieved. Any change in management’s estimate could result in the remaining amount of stock-based compensation expense to be accelerated, spread out over a longer period, or reversed. This may cause volatility in the recognition of stock-based compensation expense in future periods and could materially affect the Company’s earnings. The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended March 31, 2019 and 2018 , respectively, as follows: Three Months Ended March 31, 2019 2018 Stock-based compensation expense $ 5,038 $ 5,195 Less: Deferred tax benefit (946 ) (1,103 ) Stock-based compensation expense, net of tax $ 4,092 $ 4,092 As of March 31, 2019 , there was approximately $62,232 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 three months ended March 31 , 2019 was $9,601 . The total options exercisable as of March 31, 2019 had an intrinsic value of $170,509 . The total intrinsic value for options exercisable is calculated as the difference between the market value of the Company’s common stock as of March 31, 2019 and the weighted average exercise price of the options. The market value of the Company’s common stock as of March 31, 2019 was $52.25 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of March 31, 2019 was $33.36 . Total options that were outstanding as of March 31, 2019 were 15,347,000 . Total options that were exercisable as of March 31, 2019 were 9,024,000 . Common Stock Buyback The Company’s Board of Directors, under multiple authorizations, has authorized the repurchase of the Company’s common stock on the open market or through private transactions. The Company purchased 1,725,000 shares at a total cost of $88,791 during the three months ended March 31 , 2019 , which reduced the total shares outstanding of common stock. The cost of stock purchases during the period includes the cost of certain transactions that settled in the following quarter. As of March 31, 2019 , the Company had approximately $127,088 of authorization remaining for the purchase of common stock under the program.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The components of Accumulated other comprehensive loss, net of tax, are as follows: Foreign Currency Translation Adjustments Unrealized Gains (Losses) on Investments Accumulated Other Comprehensive Loss Balance, January 1, 2019 $ (31,587 ) $ (1,413 ) $ (33,000 ) Other comprehensive gain before reclassifications 3,397 797 4,194 Amounts reclassified from accumulated other comprehensive loss — 86 86 Net current-period other comprehensive gain 3,397 883 4,280 Balance, March 31, 2019 $ (28,190 ) $ (530 ) $ (28,720 )

Business Segment Information

Business Segment Information	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Business Segment Information	Business Segment Information The Company’s reportable business segments are: Private Banks – provides outsourced investment processing and investment management platforms to banks and trust institutions, independent wealth advisers and financial advisors worldwide; Investment Advisors – provides investment management and investment processing platforms to affluent investors through a network of independent registered investment advisors, financial planners and other investment professionals in the United States; Institutional Investors – provides investment management and administrative outsourcing platforms to retirement plan sponsors, healthcare systems and not-for-profit organizations worldwide; Investment Managers – provides investment operations outsourcing platforms to fund companies, banking institutions, traditional and non-traditional investment managers worldwide and family offices in the United States; and Investments in New Businesses – focuses on providing investment management solutions to ultra-high-net-worth families residing in the United States; developing internet-based investment services and advice platforms; entering new markets; and conducting other research and development activities. The information in the following tables is derived from the Company’s internal financial reporting used for corporate management purposes. There are no inter-segment revenues for the three months ended March 31, 2019 and 2018 . Management evaluates Company assets on a consolidated basis during interim periods. The accounting policies of the reportable business segments are the same as those described in Note 1 to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 . The following tables highlight certain financial information about each of the Company’s business segments for the three months ended March 31, 2019 and 2018 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended March 31, 2019 Revenues $ 118,259 $ 94,761 $ 80,113 $ 104,649 $ 3,038 $ 400,820 Expenses 110,962 52,502 38,754 69,066 5,940 277,224 Operating profit (loss) $ 7,297 $ 42,259 $ 41,359 $ 35,583 $ (2,902 ) $ 123,596 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended March 31, 2018 Revenues $ 122,164 $ 99,192 $ 85,491 $ 96,855 $ 1,896 $ 405,598 Expenses 112,202 52,453 41,249 63,338 5,098 274,340 Operating profit (loss) $ 9,962 $ 46,739 $ 44,242 $ 33,517 $ (3,202 ) $ 131,258 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 March 31 , 2019 and 2018 is as follows: 2019 2018 Total operating profit from segments $ 123,596 $ 131,258 Corporate overhead expenses (20,035 ) (14,942 ) Income from operations $ 103,561 $ 116,316 The following tables provide additional information for the three months ended March 31 , 2019 and 2018 pertaining to our business segments: Capital Expenditures (1) Depreciation 2019 2018 2019 2018 Private Banks $ 8,461 $ 10,239 $ 3,549 $ 3,319 Investment Advisors 3,947 4,260 1,179 1,105 Institutional Investors 871 967 405 448 Investment Managers 3,349 2,520 1,771 1,809 Investments in New Businesses 241 204 91 150 Total from business segments $ 16,869 $ 18,190 $ 6,995 $ 6,831 Corporate overhead 385 308 336 291 $ 17,254 $ 18,498 $ 7,331 $ 7,122 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2019 2018 Private Banks $ 7,141 $ 6,627 Investment Advisors 2,523 2,357 Institutional Investors 433 427 Investment Managers 2,339 2,345 Investments in New Businesses 185 40 Total from business segments $ 12,621 $ 11,796 Corporate overhead 58 58 $ 12,679 $ 11,854

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The gross liability for unrecognized tax benefits at March 31, 2019 and December 31, 2018 was $14,851 and $14,367 , respectively, exclusive of interest and penalties, of which $14,369 and $13,774 would affect the effective tax rate if the Company were to recognize the tax benefit. The Company classifies interest and penalties on unrecognized tax benefits as income tax expense. As of March 31, 2019 and December 31, 2018 , the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $1,453 and $1,289 , respectively. March 31, 2019 December 31, 2018 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 14,851 $ 14,367 Interest and penalties on unrecognized benefits 1,453 1,289 Total gross uncertain tax positions $ 16,304 $ 15,656 Amount included in Current liabilities $ 2,964 $ 3,131 Amount included in Other long-term liabilities 13,340 12,525 $ 16,304 $ 15,656 The Company's effective income tax rate for the three months ended March 31, 2019 and 2018 differs from the federal income tax statutory rate due to the following: Three Months Ended March 31, 2019 2018 Statutory rate 21.0 % 21.0 % State taxes, net of federal tax benefit 2.6 2.2 Foreign tax expense and tax rate differential (0.1 ) (0.2 ) Tax benefit from stock option exercises (1.1 ) (10.8 ) Other, net (0.3 ) (0.3 ) 22.1 % 11.9 % The increase in the Company's effective tax rate for the three months ended March 31, 2019 was primarily due to reduced tax benefits related to the lower volume of stock option exercises as compared to the three months ended March 31, 2018. The Company files income tax returns in the United States on a consolidated basis and in many U.S. state and foreign jurisdictions. The Company is subject to examination of income tax returns by the Internal Revenue Service (IRS) and other domestic and foreign tax authorities. The Company is no longer subject to U.S. federal income tax examination for years before 2015 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2014 . The Company estimates it will recognize $2,964

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Stanford Trust Company Litigation SEI has been named in seven lawsuits filed in Louisiana courts; four of the cases also name SPTC as a defendant. The underlying allegations in all actions relate to the purported role of SPTC in providing back-office services to Stanford Trust Company. The complaints allege that SEI and SPTC participated in some manner in the sale of “certificates of deposit” issued by Stanford International Bank so as to be a “seller” of the certificates of deposit for purposes of primary liability under the Louisiana Securities Law or so as to be secondarily liable under that statute for sales of certificates of deposit made by Stanford Trust Company. Two of the actions also include claims for violations of the Louisiana Racketeering Act and possibly conspiracy, and a third also asserts claims of negligence, breach of contract, breach of fiduciary duty, violations of the uniform fiduciaries law, negligent misrepresentation, detrimental reliance, violations of the Louisiana Racketeering Act, and conspiracy. The procedural status of the seven cases varies. The Lillie case, filed originally in the 19th Judicial District Court for the Parish of East Baton Rouge, was brought as a class action and is procedurally the most advanced of the cases. SEI and SPTC filed exceptions, which the Court granted in part, dismissing claims under the Louisiana Unfair Trade Practices Act and permitting the claims under the Louisiana Securities Law to go forward. On March 11, 2013, newly-added insurance carrier defendants removed the case to the United States District Court for the Middle District of Louisiana. On August 7, 2013, the Judicial Panel on Multidistrict Litigation transferred the matter to the Northern District of Texas where MDL 2099, In re: Stanford Entities Securities Litigation (“the Stanford MDL”), is pending. On September 22, 2015, the District Court on the motion of SEI and SPTC dismissed plaintiffs’ claims for primary liability under Section 714(A) of the Louisiana Securities Law, but declined to dismiss plaintiffs’ claims for secondary liability under Section 714(B) of the Louisiana Securities Law based on the allegations pled by plaintiffs. On November 4, 2015, the District Court granted SEI and SPTC's motion to dismiss plaintiffs' claims under Section 712(D) of the Louisiana Securities Law. Consequently, the only claims of plaintiffs remaining in Lillie are plaintiffs' claims for secondary liability against SEI and SPTC under Section 714(B) of the Louisiana Securities Law. On May 2, 2016, the District Court certified the class as being "all persons for whom Stanford Trust Company purchased or renewed Stanford Investment Bank Limited certificates of deposit in Louisiana between January 1, 2007 and February 13, 2009". Notice of the pendency of the class action was mailed to potential class members on October 4, 2016. On December 1, 2016, a group of plaintiffs who opted out of the Lillie class filed a complaint against SEI and SPTC in the United States District Court in the Middle District of Louisiana (“ Ahders Complaint”), alleging claims essentially the same as those in Lillie . In January 2017, the Judicial Panel on Multidistrict Litigation transferred the Ahders proceeding to the Northern District of Texas and the Stanford MDL. During February 2017, SEI filed its response to the Ahders Complaint, and in March 2017 the District Court for the Northern District of Texas approved the stipulated dismissal of all claims in this Complaint predicated on Section 712(D) or Section 714(A) of the Louisiana Securities Law. In both cases, as a result of the proceedings in the Northern District of Texas, only the plaintiffs’ secondary liability claims under Section 714(B) of the Louisiana Securities Law remain. Limited discovery and motions practice have occurred, including SEI and SPTC’s filing of a dispositive summary judgment motion in the Lillie proceeding. On January 31, 2019, the Judicial Panel on Multidistrict Litigation remanded the Lillie and Ahders proceedings to the Middle District of Louisiana. No material activity has taken place since remand. Another case, filed in the 23rd Judicial District Court for the Parish of Ascension, also was removed to federal court and transferred by the Judicial Panel on Multidistrict Litigation to the Northern District of Texas and the Stanford MDL. The schedule for responding to that Complaint has not yet been established. Two additional cases remain in the Parish of East Baton Rouge. Plaintiffs filed petitions in 2010 and have granted SEI and SPTC indefinite extensions to respond. No material activity has taken place since. In two additional cases, filed in East Baton Rouge and brought by the same counsel who filed the Lillie action, virtually all of the litigation to date has involved motions practice and appellate litigation regarding the existence of federal subject matter jurisdiction under the federal Securities Litigation Uniform Standards Act (SLUSA). The matters were removed to the United States District Court for the Northern District of Texas and consolidated. The court then dismissed the action under SLUSA. The Court of Appeals for the Fifth Circuit reversed that order, and the Supreme Court of the United States affirmed the Court of Appeals judgment on February 26, 2014. The matters were remanded to state court and no material activity has taken place since that date. While the outcome of this litigation remains uncertain, SEI and SPTC believe that they have valid defenses to plaintiffs' claims and intend to defend the lawsuits vigorously. Because of uncertainty in the make-up of the Lillie class, the specific theories of liability that may survive a motion for summary judgment or other dispositive motion, the relative lack of discovery regarding damages, causation, mitigation and other aspects that may ultimately bear upon loss, the Company is not reasonably able to provide an estimate of loss, if any, with respect to the foregoing lawsuits. SEI Capital Accumulation Plan Litigation On September 28, 2018, a class action complaint was filed in the United States District Court for the Eastern District of Pennsylvania by Gordon Stevens, individually and as the representative of similarly situated persons, and on behalf of the SEI Capital Accumulation Plan (the “Plan”) naming the Company and its affiliated and/or related entities SEI Investments Management Corporation, SEI Capital Accumulation Plan Design Committee, SEI Capital Accumulation Plan Investment Committee, SEI Capital Accumulation Plan Administration Committee, and John Does 1-30 as defendants (the “Stevens Complaint”). The Stevens Compliant seeks unspecified damages for defendants’ breach of fiduciary duties under ERISA with respect to selecting and monitoring the Plan’s investment options and by retaining affiliated investment products in the Plan. All parties to the matter have agreed to participate in non-binding mediation with the goal of resolving the matter in an efficient and satisfactory manner, while avoiding protracted litigation costs. The court granted a motion to stay the litigation pending the outcome of mediation, which is scheduled for May 7, 2019, in Atlanta, Georgia. While the outcome of this litigation remains uncertain, the defendants believe that they have valid defenses to plaintiffs’ claims and intend to defend the allegations contained in the Stevens Complaint vigorously. Because of uncertainty in the make-up of the purported class named in the Stevens Complaint, the specific theories of liability that may survive a motion for summary judgment or other dispositive motion, the lack of specificity or discovery regarding damages, causation, mitigation and other aspects that may ultimately bear upon loss, the Company is not reasonably able to provide an estimate of loss, if any, with respect to the matters set forth in the Stevens Complaint. Other Matters

Business Acquisition

Business Acquisition	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Business Acquisition	Business Acquisition On April 2, 2018 , the Company acquired all ownership interests of Huntington Steele, LLC (Huntington Steele), a registered investment advisor based in Seattle, Washington servicing the ultra-high-net-worth market. The total purchase price for Huntington Steele was $17,914 , which includes $5,794 in cash consideration, net of $125 in cash acquired, and a contingent purchase price of $12,120 . The contingent purchase price consists of amounts payable to the sellers upon the attainment of specified financial measures determined at various intervals occurring between 2019 and 2023. The current portion of the contingent purchase price of $968 is included in Accrued liabilities on the accompanying Balance Sheets. The long-term portion of the contingent consideration of $11,152

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets On April 2, 2018, the Company acquired all ownership interests of Huntington Steele (See Note 12 ). The total purchase price was allocated to Huntington Steele’s net tangible and intangible assets based upon their estimated fair values at the date of purchase. The excess purchase price over the value of the identifiable intangible assets was recorded as goodwill. The total amount of goodwill from this transaction amounted to $11,499 and is included on the accompanying Consolidated Balance Sheets. In July 2017, the Company acquired all ownership interests of Archway Technology Partners, LLC, Archway Finance & Operations, Inc. and Keystone Capital Holdings, LLC (collectively, Archway), a provider of operating technologies and services to the family office industry. The total purchase price was allocated to Archway’s net tangible and intangible assets based upon their estimated fair values at the date of purchase. The excess purchase price over the value of the net tangible and identifiable intangible assets was recorded as goodwill. The total amount of goodwill from this transaction amounted to $52,990 and is included on the accompanying Consolidated Balance Sheets. There were no changes to the Company's goodwill during the three months ended March 31, 2019 . The Company recognized $921 and $776 of amortization expense related to the intangible assets acquired through the acquisitions of Huntington Steele and Archway during the three months ended March 31, 2019 and 2018

Revenues from Contracts with Cu

Revenues from Contracts with Customers	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenues from Contracts with Customers	Revenues from Contracts with Customers The Company’s principal sources of revenues are: (1) asset management, administration and distribution fees primarily earned based upon a contractual percentage of net assets under management or administration; and (2) information processing and software servicing fees that are either recurring and primarily earned based upon the number of trust accounts being serviced or a percentage of the total average daily market value of the clients' assets processed on the Company's platforms, or non-recurring and based upon project-oriented contractual agreements related to client implementations. Disaggregation of Revenue The following tables provide additional information pertaining to our revenues disaggregated by major product line and primary geographic market based on the location of the use of the products or services for each of the Company’s business segments for the three months ended March 31, 2019 and 2018 : Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total Major Product Lines: For the Three Months Ended March 31, 2019 Investment management fees from pooled investment products $ 32,973 $ 66,623 $ 13,661 $ 205 $ 309 $ 113,771 Investment management fees from investment management agreements 702 23,838 66,171 — 2,698 93,409 Investment operations fees 376 — — 94,867 — 95,243 Investment processing fees - PaaS 43,911 — — — — 43,911 Investment processing fees - SaaS 34,708 — — 2,549 — 37,257 Professional services fees 3,777 — — 1,417 — 5,194 Account fees and other 1,812 4,300 281 5,611 31 12,035 Total revenues $ 118,259 $ 94,761 $ 80,113 $ 104,649 $ 3,038 $ 400,820 Primary Geographic Markets: United States $ 77,454 $ 94,761 $ 62,325 $ 98,058 $ 3,038 $ 335,636 United Kingdom 25,350 — 13,466 — — 38,816 Canada 10,660 — 1,727 — — 12,387 Ireland 4,795 — 2,311 6,591 — 13,697 Other — — 284 — — 284 Total revenues $ 118,259 $ 94,761 $ 80,113 $ 104,649 $ 3,038 $ 400,820 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total Major Product Lines: For the Three Months Ended March 31, 2018 Investment management fees from pooled investment products $ 35,190 $ 72,418 $ 15,858 $ — $ 225 $ 123,691 Investment management fees from investment management agreements 198 22,764 69,276 83 1,634 93,955 Investment operations fees 382 — — 87,455 — 87,837 Investment processing fees - PaaS 44,585 — — 483 — 45,068 Investment processing fees - SaaS 34,602 — — 2,365 — 36,967 Professional services fees 5,419 — — 1,887 — 7,306 Account fees and other 1,788 4,010 357 4,582 37 10,774 Total revenues $ 122,164 $ 99,192 $ 85,491 $ 96,855 $ 1,896 $ 405,598 Primary Geographic Markets: United States $ 78,133 $ 99,192 $ 64,768 $ 91,759 $ 1,896 $ 335,748 United Kingdom 27,525 — 14,787 — — 42,312 Canada 11,601 — 2,671 — — 14,272 Ireland 4,905 — 2,427 5,096 — 12,428 Other — — 838 — — 838 Total revenues $ 122,164 $ 99,192 $ 85,491 $ 96,855 $ 1,896 $ 405,598 Investment management fees from pooled investment products - Revenues associated with clients' assets invested in Company-sponsored pooled investment products. Contractual fees are stated as a percentage of the average market value of assets under management and collected on a monthly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment management fees from investment management agreements - Revenues based on assets of clients of the Institutional Investors segment primarily invested in Company-sponsored products. Each client is charged an investment management fee that is stated as a percentage of the average market value of all assets under management. The client is billed directly on a quarterly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Revenues associated with the separately managed account program offered through registered investment advisors located throughout the United States. The contractual fee is stated as a percentage of the average market value of all assets invested in the separately managed account and collected on a quarterly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment operations fees - Revenues earned from accounting and administrative services, distribution support services and regulatory and compliance services to investment management firms and family offices. The Company contracts directly with the investment management firm or family office. The contractual fees are stated as a percentage of net assets under administration and billed when asset valuations are finalized. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment processing fees - Software as a Service - Revenues associated with clients that outsource investment processing technology software and computer processing by accessing our proprietary software and data center remotely but retain responsibility for all investment operations, client administration and other back-office trust operations. The contractual fee is based on a monthly fee plus additional fees determined on a per-account or per-transaction basis. The client is billed directly on a monthly basis. Revenues are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Investment processing fees - Platform as a Service - Revenues associated with clients that outsource their entire investment operation and back-office processing functions. Through the use of the Company's proprietary platforms, the Company assumes all back-office investment processing services including investment processing, custody and safekeeping of assets, income collections, securities settlement and other related trust activities. The contractual fee is based on a monthly fee plus additional fees determined on a per-account or per-transaction basis. Contractual fees can also be stated as a percentage of the value of assets processed on the Company's platforms each month as long as the fee is in excess of a monthly contractual minimum. The client is billed directly on a monthly basis. Revenues are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Professional services fees - Revenues associated with the business services migration for investment processing clients of the Private Banks segment and investment operations clients of the Investment Managers segment. In addition, Professional services include other services such as business transformation consulting. Typically, fees are stated as a contractual fixed fee. The client is billed directly and fees are collected according to the terms of the agreement. Other - Revenues associated with custody account servicing, account terminations, reimbursements received for out-of-pocket expenses, and other fees for the provision of ancillary services. Revenue is recognized by the Company when the performance obligations are satisfied and transfer of control to the client is completed. The majority of the Company’s performance obligations are satisfied and control is transferred to the client continuously. Therefore, revenue is recognized on a monthly basis. The amount of revenue recognized reflects the amount of consideration expected to be received by the Company in exchange for satisfied performance obligations.

Leases

Leases	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Leases	Leases The Company has operating leases for corporate facilities and equipment. The Company's expense related to leases during the three months ended March 31, 2019 was $2,568 and is included in Facilities, supplies and other costs on the accompanying Consolidated Statement of Operations. The Company's future minimum lease payments under non-cancelable leases as of March 31, 2019 are as follows: 2019 (excluding the three months ended March 31, 2019) $ 6,709 2020 8,610 2021 7,570 2022 7,277 2023 7,277 Thereafter 17,404 Total future minimum lease payments 54,847 Less: Imputed interest (4,561 ) Total $ 50,286 The following table provides supplemental Consolidated Balance Sheet information related to the Company's leases: March 31, 2019 Short-term operating lease liabilities $ 8,448 Long-term operating lease liabilities 41,838 Total operating lease liabilities $ 50,286 Weighted average remaining lease term 7.0 years Weighted average discount rate 2.63 % The following table provides supplemental cash flow information related to the Company's leases: For the Three Months Ended March 31, 2019 Cash paid for amounts included in the measurement of lease liabilities $ 2,716 Right-of-use assets obtained in exchange for lease obligations 2,810 As of March 31, 2019 , the Company has additional operating lease exposure that have not yet commenced of $1,271 . These operating leases will have a commencement date occurring in the remainder of 2019 and have a lease term of five years

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policy)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America. Certain financial information and accompanying note disclosure normally included in the Company’s Annual Report on Form 10-K have been condensed or omitted. The interim financial information is unaudited but reflects all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of financial position of the Company as of March 31, 2019 , the results of operations for the three months ended March 31, 2019 and 2018 , and cash flows for the three -month periods ended March 31, 2019 and 2018 . These interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 . The Company adopted the requirements of the Accounting Standards Update (ASU) No. 2016-2 Leases (Topic 842) (Accounting Standards Codifications (ASC) 842 (ASC 842)) using the modified retrospective method during the three months ended March 31, 2019 . As a result of the adoption of ASC 842, the Company recorded additional lease assets and net lease liabilities of $44,169 as of January 1, 2019. Upon implementation, the Company elected the package of practical expedients permitted under the transition guidance within the new standard which allowed the Company to carryforward the historical lease identification, classification and initial direct cost. ASC 842 did not materially impact the Company’s consolidated net income or consolidated cash flows (see following caption "Leases"). With the exception of the adoption of ASC 842, there have been no significant changes in significant accounting policies during the three months ended March 31, 2019 as compared to the significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2018 .
Variable Interest Entities	Variable Interest Entities The Company or its affiliates have created numerous investment products for its clients in various types of legal entity structures. The Company serves as the Manager, Administrator and Distributor for these investment products and may also serve as the Trustee for some of the investment products. The Company receives asset management, distribution, administration and custodial fees for these services. Clients are the equity investors and participate in proportion to their ownership percentage in the net income or loss and net capital gains or losses of the products, and, on liquidation, will participate in proportion to their ownership percentage in the remaining net assets of the products after satisfaction of outstanding liabilities. The Company has concluded that it is not the primary beneficiary of the entities and; therefore, is not required to consolidate any of the pooled investment vehicles for which it receives asset management, distribution, administration and custodial fees under the VIE model. The entities either do not meet the definition of a VIE or the Company does not hold a variable interest in the entities. The entities either qualify for the money market scope exception, or are entities in which the Company’s asset management, distribution, administration and custodial fees are commensurate with the services provided and include fair terms and conditions, or are entities that are limited partnerships which have substantive kick-out rights. The Company acts as a fiduciary and does not hold any other interests other than insignificant seed money investments in the pooled investment vehicles. For this reason, the Company also concluded that it is not required to consolidate the pooled investment vehicles under the voting interest entity (VOE) model.
Revenue Recognition	Revenue 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 $269,591 and $315,840 at March 31, 2019 and December 31, 2018
Restricted Cash	Restricted Cash Restricted cash includes $3,000 at March 31, 2019 and December 31, 2018 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $517 and $514 at March 31, 2019 and December 31, 2018
Lesses	Leases The Company determines if an arrangement is a lease at the inception of the contract. The Company's operating leases are included in Operating lease right-of-use (ROU) assets, Short-term operating lease liabilities, and Long-term operating lease liabilities on the accompanying Consolidated Balance Sheet. The operating lease ROU assets and operating lease liabilities are recognized based on the present value of future minimum lease payments over the lease term at commencement date. As most of the Company’s leases do not provide an implicit interest rate, the Company utilizes an estimated incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. In determining the discount rate used in the present value calculation, the Company has elected to apply the portfolio approach for leases of equipment provided the leases commenced at or around the same time. This election allows the Company to account for leases at a portfolio level provided that the resulting accounting at this level would not differ materially from the accounting at the individual lease level. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company has elected to account for lease and non-lease components separately. Operating lease ROU assets include all contractual lease payments and initial direct costs incurred less any lease incentives. Facility leases generally only contain lease expense and non-component items such as taxes and pass through charges. Only the lease components are included in the ROU assets and lease liabilities. Additionally, the Company has elected not to apply the recognition requirements of ASC 842 to leases which have a lease term of less than one year at the commencement date.
Reclassification	ReclassificationsCertain prior year amounts have been reclassified to conform to current year presentation.
New Accounting Pronouncements	New Accounting Pronouncements In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13) which requires that expected credit losses relating to financial assets measured on an amortized cost basis and available-for-sale debt securities be recorded through an allowance for credit losses. ASU 2016-13 limits the amount of credit losses to be recognized for available-for-sale debt securities to the amount by which carrying value exceeds fair value and also requires the reversal of previously recognized credit losses if fair value increases. ASU 2016-13 becomes effective for the Company during the first quarter of 2020. Early adoption is permitted. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment (ASU 2017-04). The objective of ASU 2017-04 is to simplify the subsequent measurement of goodwill by entities performing their annual goodwill impairment tests by comparing the fair value of a reporting unit, including income tax effects from any tax-deductible goodwill, with its carrying amount and recognizing an impairment charge for the amount by which the carrying amount exceeds fair value. ASU 2017-04 is effective for the Company beginning in the first quarter of 2020. Early adoption is permitted. The Company is currently evaluating the impact of adopting ASU 2017-04 on its consolidated financial statements and related disclosures. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement (ASU 2018-13) which modifies the disclosure requirements on fair value measurements. ASU 2018-13 is effective for the Company beginning in the first quarter of 2020. The Company is currently evaluating the impact of adopting ASU 2018-13 on its consolidated financial statements and related disclosures. In October 2018, the FASB issued ASU 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities (ASU 2018-17). The new standard changes how entities evaluate decision-making fees under the variable interest entity guidance. ASU 2018-17 is effective for the Company beginning in the first quarter of
Equity Method Investments	The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations.
Fair Value of Financial Instruments	The fair value of the Company’s financial assets and liabilities, except for the Company's investment funds sponsored by LSV, is determined in accordance with the fair value hierarchy. The fair value of the Company’s Level 1 financial assets consist mainly of investments in open-ended mutual funds that are quoted daily. Level 2 financial assets consist of Government National Mortgage Association (GNMA) mortgage-backed securities held by the Company's wholly-owned limited purpose federal thrift subsidiary, SEI Private Trust Company (SPTC), Federal Home Loan Bank (FHLB) and other U.S. government agency short-term notes held by SIDCO. The financial assets held by SIDCO were purchased as part of a cash management program requiring only short term, top-tier investment grade government and corporate securities. The financial assets held by SPTC are debt securities issued by GNMA and are backed by the full faith and credit of the U.S. government. These securities were purchased for the sole purpose of satisfying applicable regulatory requirements and have maturity dates which range from 2021 to 2041 . The fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets. The valuation of the Company's Level 2 financial assets held by SIDCO and SPTC are based upon securities pricing policies and procedures utilized by third-party pricing vendors. The pricing policies and procedures applied for our Level 1 and Level 2 financial assets during the three months ended March 31 , 2019 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2018 . The Company had no Level 3 financial assets at March 31, 2019 or December 31, 2018
Investments in Affiliated Funds	The fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets.
Available-for-sale Securities	These net unrealized losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets.
Securities Owned	The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Calculation Of Basic And Diluted Earnings Per Share	The calculations of basic and diluted earnings per share for the three months ended March 31, 2019 and 2018 are: Three Months Ended March 31, 2019 2018 Net income $ 113,981 $ 139,838 Shares used to compute basic earnings per common share 153,310,000 157,434,000 Dilutive effect of stock options 3,231,000 5,990,000 Shares used to compute diluted earnings per common share 156,541,000 163,424,000 Basic earnings per common share $ 0.74 $ 0.89 Diluted earnings per common share $ 0.73 $ 0.86
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 three months ended March 31 : 2019 2018 Net income $ 113,981 $ 139,838 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 7,331 7,122 Amortization 12,679 11,854 Equity in earnings of unconsolidated affiliate (37,317 ) (40,607 ) Distributions received from unconsolidated affiliate 33,237 45,617 Stock-based compensation 5,038 5,195 Provision for losses on receivables (85 ) 93 Deferred income tax expense (984 ) 2,083 Net (gain) loss from investments (1,279 ) 410 Change in other long-term liabilities 277 579 Change in other assets 1,334 290 Contract costs capitalized, net of amortization (138 ) (1,234 ) Other (63 ) 450 Change in current assets and liabilities (Increase) decrease in Receivables from investment products (2,693 ) 1,757 Receivables (18,304 ) (25,657 ) Other current assets 574 (3,564 ) (Decrease) increase in Accounts payable (5,678 ) 3,195 Accrued liabilities (47,836 ) (43,522 ) Deferred revenue (175 ) 275 Total adjustments (54,082 ) (35,664 ) Net cash provided by operating activities $ 59,899 $ 104,174

Investment In Unconsolidated _2

Investment In Unconsolidated Affiliate (Tables)	3 Months Ended
	Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Condensed financial information of LSV	These tables contain condensed financial information of LSV: Condensed Statement of Operations Three Months Ended March 31, 2019 2018 Revenues $ 120,915 $ 131,718 Net income 95,948 104,406 Condensed Balance Sheets March 31, 2019 December 31, 2018 Current assets $ 148,489 $ 138,083 Non-current assets 5,047 1,165 Total assets $ 153,536 $ 139,248 Current liabilities $ 47,557 $ 47,874 Non-current liabilities 5,019 — Partners’ capital 100,960 91,374 Total liabilities and partners’ capital $ 153,536 $ 139,248

Composition of Certain Financ_2

Composition of Certain Financial Statement Captions (Tables)	3 Months Ended
	Mar. 31, 2019
Items Included in Consolidated Statement of Financial Condition [Abstract]
Receivables	Receivables on the accompanying Consolidated Balance Sheets consist of: March 31, 2019 December 31, 2018 Trade receivables $ 83,594 $ 76,362 Fees earned, not billed 237,478 226,001 Other receivables 13,285 13,691 334,357 316,054 Less: Allowance for doubtful accounts (633 ) (718 ) $ 333,724 $ 315,336
Property And Equipment	Property and Equipment on the accompanying Consolidated Balance Sheets consists of: March 31, 2019 December 31, 2018 Buildings $ 160,830 $ 160,796 Equipment 128,154 126,954 Land 10,772 10,772 Purchased software 139,794 139,245 Furniture and fixtures 18,312 18,103 Leasehold improvements 20,136 18,959 Construction in progress 13,884 9,240 491,882 484,069 Less: Accumulated depreciation (345,129 ) (338,206 ) Property and Equipment, net $ 146,753 $ 145,863
Accrued Liabilities	Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: March 31, 2019 December 31, 2018 Accrued employee compensation $ 31,825 $ 97,603 Accrued consulting, outsourcing and professional fees 33,031 31,000 Accrued sub-advisory, distribution and other asset management fees 42,616 42,583 Accrued dividend payable — 50,761 Accrued income taxes 28,464 6,559 Other accrued liabilities 37,924 51,128 Total accrued liabilities $ 173,860 $ 279,634

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Of Certain Financial Assets And Liabilities	The fair value of certain financial assets of the Company was determined using the following inputs: Fair Value Measurements at the End of the Reporting Period Using Assets March 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 11,111 $ 11,111 $ — Fixed-income available-for-sale securities 98,713 — 98,713 Fixed-income securities owned 33,433 — 33,433 Investment funds sponsored by LSV (1) 5,339 $ 148,596 $ 11,111 $ 132,146 Fair Value Measurements at the End of the Reporting Period Using Assets December 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Equity available-for-sale securities $ 10,218 $ 10,218 $ — Fixed-income available-for-sale securities 101,683 — 101,683 Fixed-income securities owned 30,892 — 30,892 Investment funds sponsored by LSV (1) 4,887 $ 147,680 $ 10,218 $ 132,575 (1) The fair value amounts presented in the tables above are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the accompanying Consolidated Balance Sheets (See Note 5

Marketable Securities (Tables)

Marketable Securities (Tables)	3 Months Ended
	Mar. 31, 2019
Marketable Securities [Abstract]
Investments Available For Sale	Investments available for sale classified as non-current assets consist of: At March 31, 2019 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,429 $ 77 $ (384 ) $ 7,122 Equities and other mutual funds 3,475 514 — 3,989 Debt securities 99,401 — (688 ) 98,713 $ 110,305 $ 591 $ (1,072 ) $ 109,824 At December 31, 2018 Cost Amount Gross Unrealized Gains Gross Unrealized (Losses) Fair Value SEI-sponsored mutual funds $ 7,446 $ — $ (788 ) $ 6,658 Equities and other mutual funds 3,434 126 — 3,560 Debt securities 103,518 — (1,835 ) 101,683 $ 114,398 $ 126 $ (2,623 ) $ 111,901

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2019
Stockholders' Equity Note [Abstract]
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan	The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended March 31, 2019 and 2018 , respectively, as follows: Three Months Ended March 31, 2019 2018 Stock-based compensation expense $ 5,038 $ 5,195 Less: Deferred tax benefit (946 ) (1,103 ) Stock-based compensation expense, net of tax $ 4,092 $ 4,092

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax	The components of Accumulated other comprehensive loss, net of tax, are as follows: Foreign Currency Translation Adjustments Unrealized Gains (Losses) on Investments Accumulated Other Comprehensive Loss Balance, January 1, 2019 $ (31,587 ) $ (1,413 ) $ (33,000 ) Other comprehensive gain before reclassifications 3,397 797 4,194 Amounts reclassified from accumulated other comprehensive loss — 86 86 Net current-period other comprehensive gain 3,397 883 4,280 Balance, March 31, 2019 $ (28,190 ) $ (530 ) $ (28,720 )

Business Segment Information (T

Business Segment Information (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Schedule Of Financial Information About Business Segments	The following tables highlight certain financial information about each of the Company’s business segments for the three months ended March 31, 2019 and 2018 . Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended March 31, 2019 Revenues $ 118,259 $ 94,761 $ 80,113 $ 104,649 $ 3,038 $ 400,820 Expenses 110,962 52,502 38,754 69,066 5,940 277,224 Operating profit (loss) $ 7,297 $ 42,259 $ 41,359 $ 35,583 $ (2,902 ) $ 123,596 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total For the Three Months Ended March 31, 2018 Revenues $ 122,164 $ 99,192 $ 85,491 $ 96,855 $ 1,896 $ 405,598 Expenses 112,202 52,453 41,249 63,338 5,098 274,340 Operating profit (loss) $ 9,962 $ 46,739 $ 44,242 $ 33,517 $ (3,202 ) $ 131,258
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 March 31 , 2019 and 2018 is as follows: 2019 2018 Total operating profit from segments $ 123,596 $ 131,258 Corporate overhead expenses (20,035 ) (14,942 ) Income from operations $ 103,561 $ 116,316
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated	The following tables provide additional information for the three months ended March 31 , 2019 and 2018 pertaining to our business segments: Capital Expenditures (1) Depreciation 2019 2018 2019 2018 Private Banks $ 8,461 $ 10,239 $ 3,549 $ 3,319 Investment Advisors 3,947 4,260 1,179 1,105 Institutional Investors 871 967 405 448 Investment Managers 3,349 2,520 1,771 1,809 Investments in New Businesses 241 204 91 150 Total from business segments $ 16,869 $ 18,190 $ 6,995 $ 6,831 Corporate overhead 385 308 336 291 $ 17,254 $ 18,498 $ 7,331 $ 7,122 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2019 2018 Private Banks $ 7,141 $ 6,627 Investment Advisors 2,523 2,357 Institutional Investors 433 427 Investment Managers 2,339 2,345 Investments in New Businesses 185 40 Total from business segments $ 12,621 $ 11,796 Corporate overhead 58 58 $ 12,679 $ 11,854

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Schedule Of Interest And Penalties	March 31, 2019 December 31, 2018 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 14,851 $ 14,367 Interest and penalties on unrecognized benefits 1,453 1,289 Total gross uncertain tax positions $ 16,304 $ 15,656 Amount included in Current liabilities $ 2,964 $ 3,131 Amount included in Other long-term liabilities 13,340 12,525 $ 16,304 $ 15,656
Schedule of Effective Income Tax Rate Reconciliation	The Company's effective income tax rate for the three months ended March 31, 2019 and 2018 differs from the federal income tax statutory rate due to the following: Three Months Ended March 31, 2019 2018 Statutory rate 21.0 % 21.0 % State taxes, net of federal tax benefit 2.6 2.2 Foreign tax expense and tax rate differential (0.1 ) (0.2 ) Tax benefit from stock option exercises (1.1 ) (10.8 ) Other, net (0.3 ) (0.3 ) 22.1 % 11.9 %

Revenues from Contracts with _2

Revenues from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables provide additional information pertaining to our revenues disaggregated by major product line and primary geographic market based on the location of the use of the products or services for each of the Company’s business segments for the three months ended March 31, 2019 and 2018 : Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total Major Product Lines: For the Three Months Ended March 31, 2019 Investment management fees from pooled investment products $ 32,973 $ 66,623 $ 13,661 $ 205 $ 309 $ 113,771 Investment management fees from investment management agreements 702 23,838 66,171 — 2,698 93,409 Investment operations fees 376 — — 94,867 — 95,243 Investment processing fees - PaaS 43,911 — — — — 43,911 Investment processing fees - SaaS 34,708 — — 2,549 — 37,257 Professional services fees 3,777 — — 1,417 — 5,194 Account fees and other 1,812 4,300 281 5,611 31 12,035 Total revenues $ 118,259 $ 94,761 $ 80,113 $ 104,649 $ 3,038 $ 400,820 Primary Geographic Markets: United States $ 77,454 $ 94,761 $ 62,325 $ 98,058 $ 3,038 $ 335,636 United Kingdom 25,350 — 13,466 — — 38,816 Canada 10,660 — 1,727 — — 12,387 Ireland 4,795 — 2,311 6,591 — 13,697 Other — — 284 — — 284 Total revenues $ 118,259 $ 94,761 $ 80,113 $ 104,649 $ 3,038 $ 400,820 Private Banks Investment Advisors Institutional Investors Investment Managers Investments In New Businesses Total Major Product Lines: For the Three Months Ended March 31, 2018 Investment management fees from pooled investment products $ 35,190 $ 72,418 $ 15,858 $ — $ 225 $ 123,691 Investment management fees from investment management agreements 198 22,764 69,276 83 1,634 93,955 Investment operations fees 382 — — 87,455 — 87,837 Investment processing fees - PaaS 44,585 — — 483 — 45,068 Investment processing fees - SaaS 34,602 — — 2,365 — 36,967 Professional services fees 5,419 — — 1,887 — 7,306 Account fees and other 1,788 4,010 357 4,582 37 10,774 Total revenues $ 122,164 $ 99,192 $ 85,491 $ 96,855 $ 1,896 $ 405,598 Primary Geographic Markets: United States $ 78,133 $ 99,192 $ 64,768 $ 91,759 $ 1,896 $ 335,748 United Kingdom 27,525 — 14,787 — — 42,312 Canada 11,601 — 2,671 — — 14,272 Ireland 4,905 — 2,427 5,096 — 12,428 Other — — 838 — — 838 Total revenues $ 122,164 $ 99,192 $ 85,491 $ 96,855 $ 1,896 $ 405,598

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Schedule of Future Minimum Lease Payments	The Company's future minimum lease payments under non-cancelable leases as of March 31, 2019 are as follows: 2019 (excluding the three months ended March 31, 2019) $ 6,709 2020 8,610 2021 7,570 2022 7,277 2023 7,277 Thereafter 17,404 Total future minimum lease payments 54,847 Less: Imputed interest (4,561 ) Total $ 50,286
Supplemental Consolidated Balance Sheet Information Related to Operating Leases	The following table provides supplemental Consolidated Balance Sheet information related to the Company's leases: March 31, 2019 Short-term operating lease liabilities $ 8,448 Long-term operating lease liabilities 41,838 Total operating lease liabilities $ 50,286 Weighted average remaining lease term 7.0 years Weighted average discount rate 2.63 %
Supplemental Cash Flow Information Related to Operating Leases	The following table provides supplemental cash flow information related to the Company's leases: For the Three Months Ended March 31, 2019 Cash paid for amounts included in the measurement of lease liabilities $ 2,716 Right-of-use assets obtained in exchange for lease obligations 2,810

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Summary of Significant Accounting Policies [Line Items]
Operating Lease Right-of-Use Assets	$ 45,297
Lease liabilities	50,286
Cash and cash equivalents invested in SEI-sponsored money market funds	669,323			$ 754,525
Restricted cash	3,517			3,514
Capitalized software development costs	9,937	$ 12,887
Net book value of capitalized software	$ 307,736			309,500
Anti-dilutive employee stock options (in shares)	6,323	6,054
Anti-dilutive employee stock options (in USD per share)	$ 54.81	$ 52.73
SEI Wealth Platform
Summary of Significant Accounting Policies [Line Items]
Capitalized software development costs	$ 9,739	$ 12,042
Net book value of capitalized software	288,006
Capitalized software in progress	45,180
Amortization expense of capitalized software	$ 10,399	9,719
SEI Wealth Platform | Weighted Average
Summary of Significant Accounting Policies [Line Items]
Weighted Average Estimated Useful Life	8 years 6 months
SEI-Sponsored Open-Ended Money Market Mutual Funds
Summary of Significant Accounting Policies [Line Items]
Cash and cash equivalents invested in SEI-sponsored money market funds	$ 269,591			315,840
SEI Investments (Europe) Limited
Summary of Significant Accounting Policies [Line Items]
Restricted cash	3,000			3,000
SEI Investments Distribution Co. (SIDCO)
Summary of Significant Accounting Policies [Line Items]
Restricted cash	517			$ 514
SEI-Sponsored Open-Ended Money Market Mutual Funds
Summary of Significant Accounting Policies [Line Items]
Fees waived according to expense limitation agreements	$ 7,905	$ 6,654
Accounting Standards Update 2016-02
Summary of Significant Accounting Policies [Line Items]
Operating Lease Right-of-Use Assets			$ 44,169
Lease liabilities			$ 44,169

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accounting Policies [Abstract]
Net income	$ 113,981	$ 139,838
Shares used to compute basic earnings per common share (in shares)	153,310	157,434
Dilutive effect of stock options (in shares)	3,231	5,990
Shares used to compute diluted earnings per common share (in shares)	156,541	163,424
Basic earnings per common share (in USD per share)	$ 0.74	$ 0.89
Diluted earnings per common share (in USD per share)	$ 0.73	$ 0.86

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accounting Policies [Abstract]
Net income	$ 113,981	$ 139,838
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	7,331	7,122
Amortization	12,679	11,854
Equity in earnings of unconsolidated affiliate	(37,317)	(40,607)
Distributions received from unconsolidated affiliate	33,237	45,617
Stock-based compensation	5,038	5,195
Provision for losses on receivables	(85)	93
Deferred income tax expense	(984)	2,083
Net (gain) loss from investments	(1,279)	410
Change in other long-term liabilities	277	579
Change in other assets	1,334	290
Contract costs capitalized, net of amortization	(138)	(1,234)
Other	(63)	450
(Increase) decrease in
Receivables from investment products	(2,693)	1,757
Receivables	(18,304)	(25,657)
Other current assets	574	(3,564)
(Decrease) increase in
Accounts payable	(5,678)	3,195
Accrued liabilities	(47,836)	(43,522)
Deferred revenue	(175)	275
Total adjustments	(54,082)	(35,664)
Net cash provided by operating activities	$ 59,899	$ 104,174

Investment In Unconsolidated _3

Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Investments in and Advances to Affiliates [Line Items]
Distributions received from unconsolidated affiliate	$ 33,237	$ 45,617
Company's share in the earnings of equity method investee	$ 37,317	40,607
LSV Asset Management
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage	38.90%
Total investment in equity method investee	$ 56,422
Distributions received from unconsolidated affiliate	33,237	45,617
Company's share in the earnings of equity method investee	$ 37,317	$ 40,607

Investment In Unconsolidated _4

Investment In Unconsolidated Affiliate (Statement of Operations) (Details) - LSV Asset Management - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Revenues	$ 120,915	$ 131,718
Net income	$ 95,948	$ 104,406

Investment in Unconsolidated _5

Investment in Unconsolidated Affiliate (Balance Sheets) (Details) - LSV Asset Management - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Current assets	$ 148,489	$ 138,083
Non-current assets	5,047	1,165
Total assets	153,536	139,248
Current liabilities	47,557	47,874
Non-current liabilities	5,019	0
Partners’ capital	100,960	91,374
Total liabilities and partners’ capital	$ 153,536	$ 139,248

Composition of Certain Financ_3

Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Items Included in Consolidated Statement of Financial Condition [Abstract]
Trade receivables	$ 83,594	$ 76,362
Fees earned, not billed	237,478	226,001
Other receivables	13,285	13,691
Receivables, Gross, Current	334,357	316,054
Less: Allowance for doubtful accounts	(633)	(718)
Receivables, net	$ 333,724	$ 315,336

Composition of Certain Financ_4

Composition of Certain Financial Statement Captions (Property And Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Property and Equipment [Line Items]
Property and Equipment, gross	$ 491,882		$ 484,069
Less: Accumulated depreciation	(345,129)		(338,206)
Property and Equipment, net	146,753		145,863
Depreciation expense	7,331	$ 7,122
Buildings
Property and Equipment [Line Items]
Property and Equipment, gross	160,830		160,796
Equipment
Property and Equipment [Line Items]
Property and Equipment, gross	128,154		126,954
Land
Property and Equipment [Line Items]
Property and Equipment, gross	10,772		10,772
Purchased software
Property and Equipment [Line Items]
Property and Equipment, gross	139,794		139,245
Furniture and fixtures
Property and Equipment [Line Items]
Property and Equipment, gross	18,312		18,103
Leasehold improvements
Property and Equipment [Line Items]
Property and Equipment, gross	20,136		18,959
Construction in progress
Property and Equipment [Line Items]
Property and Equipment, gross	$ 13,884		$ 9,240

Composition of Certain Financ_5

Composition of Certain Financial Statement Captions (Deferred Contract Costs) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Items Included in Consolidated Statement of Financial Condition [Abstract]
Deferred contract costs	$ 24,145,000		$ 24,007,000
Capitalized contract cost, amount capitalized during period	1,126,000	$ 1,816,000
Amortization of deferred contract costs	988,000	$ 582,000
Capitalized contract cost impairment	$ 0

Composition of Certain Financ_6

Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 31,825	$ 97,603
Accrued consulting, outsourcing and professional fees	33,031	31,000
Accrued sub-advisory, distribution and other asset management fees	42,616	42,583
Accrued dividend payable	0	50,761
Accrued income taxes	28,464	6,559
Other accrued liabilities	37,924	51,128
Total accrued liabilities	$ 173,860	$ 279,634

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Apr. 02, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	$ 5,339	$ 4,887
Fixed-income securities owned	33,433	30,892
Assets, fair value	148,596	147,680
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-income securities owned	0	0
Assets, fair value	11,111	10,218
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-income securities owned	33,433	30,892
Assets, fair value	132,146	132,575
Huntington Steele, LLC
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent purchase price			$ 12,120
Huntington Steele, LLC | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent purchase price	12,120	12,120
SEI Sponsored Mutual Funds, Equities and Other Mutual Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	11,111	10,218
SEI Sponsored Mutual Funds, Equities and Other Mutual Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	11,111	10,218
SEI Sponsored Mutual Funds, Equities and Other Mutual Funds | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	0	0
Fixed income securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	98,713	101,683
Fixed income securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	0	0
Fixed income securities | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	98,713	101,683
Investment funds sponsored by LSV
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	$ 5,339	$ 4,887

Marketable Securities (Investme

Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Equity securities, FV-NI	$ 5,339	$ 4,887
Investments Available for sale, Cost Amount	110,305	114,398
Investments Available for sale, Gross Unrealized Gains	591	126
Investments Available for sale, Gross Unrealized (Losses)	(1,072)	(2,623)
Investments Available for sale, Fair Value	109,824	111,901
SEI-sponsored mutual funds
Debt Securities, Available-for-sale [Line Items]
Equity securities, FV-NI, Cost Amount	7,429	7,446
Equity securities, FV-NI, Gross Unrealized Gains	77	0
Equity securities, FV-NI, Gross Unrealized (Losses)	(384)	(788)
Equity securities, FV-NI	7,122	6,658
Equities and other mutual funds
Debt Securities, Available-for-sale [Line Items]
Equity securities, FV-NI, Cost Amount	3,475	3,434
Equity securities, FV-NI, Gross Unrealized Gains	514	126
Equity securities, FV-NI, Gross Unrealized (Losses)	0	0
Equity securities, FV-NI	3,989	3,560
Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, Cost Amount	99,401	103,518
Debt securities, Gross Unrealized Gains	0	0
Debt securities, Gross Unrealized (Losses)	(688)	(1,835)
Debt securities, Fair Value	$ 98,713	$ 101,683

Marketable Securities (Narrativ

Marketable Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Schedule of Investments [Line Items]
Net unrealized losses of available-for-sale debt securities	$ 530		$ 1,413
Unrealized losses during the period, income tax benefit	158		422
Available-for-sale securities, gross realized gains		$ 458
Available-for-sale securities, gross realized losses		182
Investments in Affiliated Funds, at fair value	5,339		4,887
Securities owned	33,433		30,892
Investment Funds Sponsored by LSV
Schedule of Investments [Line Items]
Investments in Affiliated Funds, at fair value	5,339		$ 4,887
Gains (losses) from investment funds sponsored by LSV	$ 452	$ (500)

Line of Credit (Details)

Line of Credit (Details) - USD ($)	Jun. 13, 2016	Mar. 31, 2019
Line of Credit Facility [Line Items]
Letters of credit outstanding amount		$ 13,813,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Credit facility term of agreement	5 years
Credit facility maximum borrowing capacity	$ 300,000,000
Credit facility stated percentage	0.00%
Credit facility accordion feature, increase limit	$ 100,000,000
Credit facility remaining borrowing capacity		286,187,000
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.00%
Revolving Credit Facility | Federal Funds Rate
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	0.50%
Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion	0.15%
Revolving Credit Facility | Minimum | Lender's Base Rate Plus Market Spread
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	0.25%
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.25%
Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion	0.30%
Revolving Credit Facility | Maximum | Lender's Base Rate Plus Market Spread
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.00%
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	2.00%
Letter of Credit
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity		$ 15,000,000
Credit facility, commitment fee percentage		1.25%
Credit facility, fronting fee percentage		0.175%

Shareholders' Equity (Narrative

Shareholders' Equity (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 62,232
Total intrinsic value of options exercised	9,601
Aggregate intrinsic value of options exercisable	$ 170,509
Market value of Company's common stock (in USD per share) | $ / shares	$ 52.25
Weighted average exercise price per share (in USD per share) | $ / shares	$ 33.36
Total options outstanding (in shares) | shares	15,347
Total options exercisable (in shares) | shares	9,024
Common Stock Buyback
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased and retired (in shares) | shares	1,725
Company purchased, cost	$ 88,791
Remaining stock repurchase authorization amount	$ 127,088
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
	Mar. 31, 2019	Mar. 31, 2018
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 5,038	$ 5,195
Less: Deferred tax benefit	(946)	(1,103)
Stock-based compensation expense, net of tax	$ 4,092	$ 4,092

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,593,147
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	4,194
Amounts reclassified from accumulated other comprehensive loss	86
Net current-period other comprehensive gain	4,280
Ending balance	1,636,550
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(31,587)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	3,397
Amounts reclassified from accumulated other comprehensive loss	0
Net current-period other comprehensive gain	3,397
Ending balance	(28,190)
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,413)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	797
Amounts reclassified from accumulated other comprehensive loss	86
Net current-period other comprehensive gain	883
Ending balance	(530)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(33,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Ending balance	$ (28,720)

Business Segment Information (S

Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 400,820	$ 405,598
Expenses	277,224	274,340
Operating profit (loss)	123,596	131,258
Private Banks
Segment Reporting Information [Line Items]
Revenues	118,259	122,164
Expenses	110,962	112,202
Operating profit (loss)	7,297	9,962
Investment Advisors
Segment Reporting Information [Line Items]
Revenues	94,761	99,192
Expenses	52,502	52,453
Operating profit (loss)	42,259	46,739
Institutional Investors
Segment Reporting Information [Line Items]
Revenues	80,113	85,491
Expenses	38,754	41,249
Operating profit (loss)	41,359	44,242
Investment Managers
Segment Reporting Information [Line Items]
Revenues	104,649	96,855
Expenses	69,066	63,338
Operating profit (loss)	35,583	33,517
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues	3,038	1,896
Expenses	5,940	5,098
Operating profit (loss)	$ (2,902)	$ (3,202)

Business Segment Information (R

Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Total operating profit from segments	$ 123,596	$ 131,258
Income from operations	103,561	116,316
Operating Segments
Segment Reporting Information [Line Items]
Total operating profit from segments	123,596	131,258
Corporate
Segment Reporting Information [Line Items]
Corporate overhead expenses	$ (20,035)	$ (14,942)

Business Segment Information _2

Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Capital Expenditures	$ 17,254	$ 18,498
Depreciation	7,331	7,122
Amortization	12,679	11,854
Operating Segments
Segment Reporting Information [Line Items]
Capital Expenditures	16,869	18,190
Depreciation	6,995	6,831
Amortization	12,621	11,796
Operating Segments | Private Banks
Segment Reporting Information [Line Items]
Capital Expenditures	8,461	10,239
Depreciation	3,549	3,319
Amortization	7,141	6,627
Operating Segments | Investment Advisors
Segment Reporting Information [Line Items]
Capital Expenditures	3,947	4,260
Depreciation	1,179	1,105
Amortization	2,523	2,357
Operating Segments | Institutional Investors
Segment Reporting Information [Line Items]
Capital Expenditures	871	967
Depreciation	405	448
Amortization	433	427
Operating Segments | Investment Managers
Segment Reporting Information [Line Items]
Capital Expenditures	3,349	2,520
Depreciation	1,771	1,809
Amortization	2,339	2,345
Operating Segments | Investments In New Businesses
Segment Reporting Information [Line Items]
Capital Expenditures	241	204
Depreciation	91	150
Amortization	185	40
Corporate
Segment Reporting Information [Line Items]
Capital Expenditures	385	308
Depreciation	336	291
Amortization	$ 58	$ 58

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 14,851	$ 14,367
Unrecognized tax benefits that would affect effective tax rate	14,369	13,774
Interest and penalties on unrecognized benefits	1,453	$ 1,289
Settlement and Lapse of Statute
Income Tax Contingency [Line Items]
Unrecognized tax benefits within the next twelve months	$ 2,964

Income Taxes (Interest And Pena

Income Taxes (Interest And Penalties) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 14,851	$ 14,367
Interest and penalties on unrecognized benefits	1,453	1,289
Total gross uncertain tax positions	16,304	15,656
Amount included in Current liabilities	2,964	3,131
Amount included in Other long-term liabilities	$ 13,340	$ 12,525

Income Taxes (Effective Income

Income Taxes (Effective Income Tax Rate Reconciliation) (Details)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Abstract]
Statutory rate	21.00%	21.00%
State taxes, net of federal tax benefit	2.60%	2.20%
Foreign tax expense and tax rate differential	(0.10%)	(0.20%)
Tax benefit from stock option exercises	(1.10%)	(10.80%)
Other, net	(0.30%)	(0.30%)
Effective income tax rate	22.10%	11.90%

Commitments and Contingencies (

Commitments and Contingencies (Details)	Mar. 31, 2019Lawsuit
Loss Contingencies [Line Items]
Number of lawsuits filed	7
Cases with SPTC as Defendant
Loss Contingencies [Line Items]
Number of lawsuits filed	4
Claims for Violations of Louisiana Racketeering Act
Loss Contingencies [Line Items]
Number of lawsuits filed	2
Cases Remaining in Parish of East Baton Rouge Granted Indefinite Extensions to Respond
Loss Contingencies [Line Items]
Number of lawsuits filed	2
Cases Filed in East Baton Rouge
Loss Contingencies [Line Items]
Number of lawsuits filed	2

Business Acquisition (Details)

Business Acquisition (Details) - USD ($) $ in Thousands	Apr. 02, 2018	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Amortization expense		$ 921	$ 776
Huntington Steele, LLC
Business Acquisition [Line Items]
Total purchase price	$ 17,914
Net cash consideration	5,794
Cash acquired from acquisition	125
Contingent purchase price	12,120
Accrued liabilities | Huntington Steele, LLC
Business Acquisition [Line Items]
Contingent purchase price, current	968
Other long-term liabilities | Huntington Steele, LLC
Business Acquisition [Line Items]
Contingent purchase price, noncurrent	$ 11,152

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Apr. 02, 2018	Jul. 03, 2017
Goodwill [Line Items]
Goodwill	$ 64,489,000		$ 64,489,000
Goodwill change during period	0
Amortization expense	$ 921,000	$ 776,000
Huntington Steele, LLC
Goodwill [Line Items]
Goodwill				$ 11,499,000
Archway
Goodwill [Line Items]
Goodwill					$ 52,990,000

Revenues from Contracts with _3

Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 400,820	$ 405,598
United States
Disaggregation of Revenue [Line Items]
Revenues	335,636	335,748
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	38,816	42,312
Canada
Disaggregation of Revenue [Line Items]
Revenues	12,387	14,272
Ireland
Disaggregation of Revenue [Line Items]
Revenues	13,697	12,428
Other
Disaggregation of Revenue [Line Items]
Revenues	284	838
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	113,771	123,691
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	93,409	93,955
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	95,243	87,837
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	43,911	45,068
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	37,257	36,967
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	5,194	7,306
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	12,035	10,774
Private Banks
Disaggregation of Revenue [Line Items]
Revenues	118,259	122,164
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues	77,454	78,133
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	25,350	27,525
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues	10,660	11,601
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues	4,795	4,905
Private Banks | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Private Banks | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	32,973	35,190
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	702	198
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	376	382
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	43,911	44,585
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	34,708	34,602
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	3,777	5,419
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,812	1,788
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues	94,761	99,192
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues	94,761	99,192
Investment Advisors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	66,623	72,418
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	23,838	22,764
Investment Advisors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	4,300	4,010
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues	80,113	85,491
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues	62,325	64,768
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	13,466	14,787
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues	1,727	2,671
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	2,311	2,427
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues	284	838
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	13,661	15,858
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	66,171	69,276
Institutional Investors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	281	357
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues	104,649	96,855
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues	98,058	91,759
Investment Managers | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Ireland
Disaggregation of Revenue [Line Items]
Revenues	6,591	5,096
Investment Managers | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	205	0
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	0	83
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	94,867	87,455
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	483
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	2,549	2,365
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	1,417	1,887
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	5,611	4,582
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues	3,038	1,896
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues	3,038	1,896
Investments In New Businesses | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	309	225
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	2,698	1,634
Investments In New Businesses | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	$ 31	$ 37

Leases (Narrative) (Details)

Leases (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating leases expense	$ 2,568
Operating ease exposure that have not yet commenced	$ 1,271
Operating ease exposure that have not yet commenced, lease term	5 years

Leases (Schedule of Future Mini

Leases (Schedule of Future Minimum Lease Payments) (Details) $ in Thousands	Mar. 31, 2019USD ($)
Leases [Abstract]
2019 (excluding the three months ended March 31, 2019)	$ 6,709
2020	8,610
2021	7,570
2022	7,277
2023	7,277
Thereafter	17,404
Total future minimum lease payments	54,847
Less: Imputed interest	(4,561)
Lease liabilities	$ 50,286

Leases (Supplemental Consolidat

Leases (Supplemental Consolidated Balance Sheet Information Related to Operating Leases) (Details) $ in Thousands	Mar. 31, 2019USD ($)
Leases [Abstract]
Short-term operating lease liabilities	$ 8,448
Long-term Operating Lease Liabilities	41,838
Total operating lease liabilities	$ 50,286
Weighted average remaining lease term	7 years
Weighted average discount rate	2.63%

Leases (Supplemental Cash Flow

Leases (Supplemental Cash Flow Information Related to Operating Leases) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities	$ 2,716
Right-of-use assets obtained in exchange for lease obligations	$ 2,810