10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 ________________________________________

FORM 10-Q

________________________________________

(Mark One)*

ý Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

for the quarterly period ended June 30, 2012

or

¨ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

for the transition period from              to             

0-10200

(Commission File Number)

________________________________________ 

SEI INVESTMENTS COMPANY

(Exact name of registrant as specified in its charter)

________________________________________ 

Pennsylvania	23-1707341
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification Number)

1 Freedom Valley Drive, Oaks, Pennsylvania 19456-1100

(Address of principal executive offices)

(Zip Code)

(610) 676-1000

(Registrant’s telephone number, including area code)

N/A

(Former name, former address and former fiscal year, if changed since last report)

 ________________________________________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ýNo  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	ý	Accelerated filer	¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý

The number of shares outstanding of the registrant’s common stock as of July 31, 2012 was 173,556,605.

SEI Investments Company TABLE OF CONTENTS
		Page
PART I - FINANCIAL INFORMATION
Item 1.	Financial Statements.	2
	Consolidated Balance Sheets (Unaudited) -- June 30, 2012 and December 31, 2011	2
	Consolidated Statements of Operations (Unaudited) -- For the Three and Six Months Ended June 30, 2012 and 2011	4
	Consolidated Statements of Comprehensive Income (Unaudited) -- For the Three and Six Months Ended June 30, 2012 and 2011	5
	Consolidated Statements of Cash Flows (Unaudited) -- For the Six Months Ended June 30, 2012 and 2011	6
	Notes to Consolidated Financial Statements	7
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations.	24
Item 3.	Quantitative and Qualitative Disclosures About Market Risk.	35
Item 4.	Controls and Procedures.	35
PART II - OTHER INFORMATION
Item 1.	Legal Proceedings.	37
Item 1A.	Risk Factors.	38
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds.	39
Item 6.	Exhibits.	39
	Signatures	40

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PART I. FINANCIAL INFORMATION

Item 1. Consolidated Financial Statements.

SEI Investments Company Consolidated Balance Sheets (unaudited) (In thousands)
	June 30, 2012		December 31, 2011
Assets
Current Assets:
Cash and cash equivalents	$	347,494	$	420,986
Restricted cash	6,000		6,000
Receivables from regulated investment companies	33,681		25,800
Receivables, net of allowance for doubtful accounts of $820 and $924 (Note 4)	168,913		142,109
Deferred income taxes	455		1,150
Securities owned (Note 6)	21,057		20,949
Other current assets	17,810		17,957
Total Current Assets	595,410		634,951
Property and Equipment, net of accumulated depreciation of $191,976 and $182,453 (Note 4)	135,011		129,548
Capitalized Software, net of accumulated amortization of $131,631 and $117,100	312,815		309,133
Investments Available for Sale (Note 6)	81,238		83,008
Trading Securities (Note 6)	53,253		56,325
Investment in Unconsolidated Affiliate (Note 2)	63,553		60,954
Other Assets, net	23,582		20,640
Total Assets	$	1,264,862	$	1,294,559

The accompanying notes are an integral part of these consolidated financial statements.

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SEI Investments Company Consolidated Balance Sheets (unaudited) (In thousands, except par value)
	June 30, 2012		December 31, 2011
Liabilities and Equity
Current Liabilities:
Accounts payable	$	3,850	$	1,999
Accrued liabilities (Note 4)	100,902		147,044
Deferred revenue	631		2,030
Total Current Liabilities	105,383		151,073
Deferred Income Taxes	91,819		93,751
Other Long-term Liabilities (Note 11)	10,632		8,276
Total Liabilities	207,834		253,100
Commitments and Contingencies (Note 12)
Equity:
SEI Investments shareholders’ equity:
Common stock, $.01 par value, 750,000 shares authorized; 173,374 and 176,506 shares issued and outstanding	1,734		1,765
Capital in excess of par value	588,419		577,949
Retained earnings	447,812		443,702
Accumulated other comprehensive income, net	2,137		1,900
Total SEI Investments shareholders’ equity	1,040,102		1,025,316
Noncontrolling interest	16,926		16,143
Total Equity	1,057,028		1,041,459
Total Liabilities and Equity	$	1,264,862	$	1,294,559

The accompanying notes are an integral part of these consolidated financial statements.

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SEI Investments Company

Consolidated Statements of Operations

(unaudited)

(In thousands, except per share data)

	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Revenues:
Asset management, administration and distribution fees	$	176,613		$	172,331		$	349,567		$	339,835
Information processing and software servicing fees	57,254			56,035			113,454			111,859
Transaction-based and trade execution fees	7,370			9,394			16,114			18,559
Total revenues	241,237			237,760			479,135			470,253
Expenses:
Subadvisory, distribution and other asset management costs	25,884			26,304			54,351			52,600
Software royalties and other information processing costs	5,228			7,188			11,705			14,205
Brokerage commissions	5,634			6,599			11,941			13,180
Compensation, benefits and other personnel	80,531			72,613			159,074			143,638
Stock-based compensation	3,865			3,810			7,898			7,542
Consulting, outsourcing and professional fees	26,329			29,398			53,284			55,396
Data processing and computer related	11,659			11,610			23,124			22,913
Facilities, supplies and other costs	15,272			14,098			29,780			28,200
Amortization	7,407			6,792			15,029			13,023
Depreciation	5,630			5,391			11,062			11,002
Total expenses	187,439			183,803			377,248			361,699
Income from operations	53,798			53,957			101,887			108,554
Net gain (loss) from investments	664			(1,948		)	3,869			5,330
Interest and dividend income	1,440			1,436			2,927			2,980
Interest expense	(113		)	(155		)	(274		)	(359		)
Equity in earnings of unconsolidated affiliate	22,712			29,530			50,042			58,479
Net income before income taxes	78,501			82,820			158,451			174,984
Income taxes	28,762			28,707			58,477			62,831
Net income	49,739			54,113			99,974			112,153
Less: Net income attributable to the noncontrolling interest	(184		)	(510		)	(454		)	(822		)
Net income attributable to SEI Investments Company	$	49,555		$	53,603		$	99,520		$	111,331
Basic earnings per common share	$	0.28		$	0.29		$	0.57		$	0.60
Shares used to compute basic earnings per share	174,830			184,585			175,589			185,186
Diluted earnings per common share	$	0.28		$	0.29		$	0.56		$	0.59
Shares used to compute diluted earnings per share	175,913			187,020			176,791			187,757
Dividends declared per common share	$	0.15		$	0.12		$	0.15		$	0.12

The accompanying notes are an integral part of these consolidated financial statements.

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SEI Investments Company

Consolidated Statements of Comprehensive Income

(unaudited)

(In thousands)

	Three Months Ended June 30,									Six Months Ended June 30,
	2012				2011					2012					2011
Net income		$	49,739				$	54,113				$	99,974				$	112,153
Other comprehensive income, net of tax:
Foreign currency translation adjustments		(2,156		)			1,467					547					4,295
Unrealized holding gain on investments:
Unrealized holding gains during the period, net of income taxes of $70, $348, $77 and $236	25				816					56					646
Less: reclassification adjustment for losses (gains) realized in net income, net of income taxes of $12, $(15), $(23) and $(75)	23	48			(28	)	788			(37	)	19			(131	)	515
Total other comprehensive income, net of tax		(2,108		)			2,255					566					4,810
Comprehensive income		$	47,631				$	56,368				$	100,540				$	116,963
Comprehensive income attributable to the noncontrolling interest		(30		)			(1,015		)			(783		)			(1,747		)
Comprehensive income attributable to SEI Investments Company		$	47,601				$	55,353				$	99,757				$	115,216

The accompanying notes are an integral part of these consolidated financial statements.

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SEI Investments Company

Consolidated Statements of Cash Flows

(unaudited)

(In thousands)

	Six Months Ended June 30,
	2012			2011
Cash flows from operating activities:
Net income	$	99,974		$	112,153
Adjustments to reconcile net income to net cash provided by operating activities	(24,861		)	(19,313		)
Net cash provided by operating activities	75,113			92,840
Cash flows from investing activities:
Additions to property and equipment	(16,344		)	(6,973		)
Additions to capitalized software	(18,214		)	(20,537		)
Purchases of marketable securities	(13,827		)	(36,596		)
Prepayments and maturities of marketable securities	22,170			23,134
Sales of marketable securities	737			37,408
Purchases of other investments	(2,720		)	—
Sales of other investments	—			4,905
Net cash (used in) provided by investing activities	(28,198		)	1,341
Cash flows from financing activities:
Payments on long-term debt	—			(55,000		)
Purchase and retirement of common stock	(80,899		)	(94,137		)
Proceeds from issuance of common stock	14,765			20,845
Tax benefit on stock options exercised	(1,638		)	2,171
Payment of dividends	(52,635		)	(22,041		)
Net cash used in financing activities	(120,407		)	(148,162		)
Net decrease in cash and cash equivalents	(73,492		)	(53,981		)
Cash and cash equivalents, beginning of period	420,986			496,292
Cash and cash equivalents, end of period	$	347,494		$	442,311

The accompanying notes are an integral part of these consolidated financial statements.

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Notes to Consolidated Financial Statements

(all figures are in thousands except per share data)

Note 1.    Summary of Significant Accounting Policies

Nature of Operations

SEI Investments Company (the Company), a Pennsylvania corporation, provides investment processing, investment management, and investment operations solutions to corporations, financial institutions, financial advisors, and ultra-high-net-worth families in the United States, Canada, the United Kingdom, continental Europe, and other various locations throughout the world. Investment processing solutions consist of application and business process outsourcing services, professional services and transaction-based services. Revenues from investment processing solutions are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations, except for fees earned associated with trade execution services.

Investment management programs consist of mutual funds, alternative investments and separate accounts. These include a series of money market, equity, fixed-income and alternative investment portfolios, primarily in the form of registered investment companies. The Company serves as the administrator and investment advisor for many of these products. Revenues from investment management programs are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Investment operations solutions offer investment managers support for traditional investment products such as mutual funds, collective investment trusts, exchange-traded funds, and institutional and separate accounts, by providing outsourcing services including fund and investment accounting, administration, reconciliation, investor servicing and client reporting. These solutions also provide support to managers focused on alternative investments who manage hedge funds, funds of hedge funds, private equity funds and real estate funds, across registered, partnership and separate account structures domiciled in the United States and overseas. Revenues from investment operations solutions are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Basis of Presentation

The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America. Certain financial information and accompanying note disclosure normally included in the Company’s Annual Report on Form 10-K has been condensed or omitted. The interim financial information is unaudited but reflects all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of financial position of the Company as of June 30, 2012, the results of operations for the three and six months ended June 30, 2012 and 2011, and cash flows for the six month periods ended June 30, 2012 and 2011. 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, 2011.

There have been no significant changes in significant accounting policies during the six months ended June 30, 2012 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2011.

Cash and Cash Equivalents

Cash and cash equivalents includes $185,240 and $281,760 at June 30, 2012 and December 31, 2011, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds.

Restricted Cash

Restricted cash includes $5,000 at June 30, 2012 and December 31, 2011 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $1,000 at June 30, 2012 and December 31, 2011 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 for broker-dealers.

Capitalized Software

The Company capitalized $18,214 and $20,537 of software development costs during the six months ended June 30, 2012 and 2011, respectively. As of June 30, 2012, capitalized software placed into service included on the accompanying Consolidated Balance Sheet had a weighted average remaining life of approximately 10.0 years. Amortization expense related

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to capitalized software was $14,531 and $12,532 during the six months ended June 30, 2012 and 2011, respectively.

Software development costs capitalized during the six months ended June 30, 2012 and 2011 relates to the continued development of the Global Wealth Platform (GWP). As of June 30, 2012, the net book value of GWP was $302,829, net of accumulated amortization of $102,059. Capitalized software development costs in-progress at June 30, 2012 associated with future releases to GWP were $9,328. GWP has an estimated useful life of 15 years and a weighted average remaining life of 10.0 years. Amortization expense for GWP was $14,297 and $12,249 during the six months ended June 30, 2012 and 2011, respectively.

Earnings per Share

The calculations of basic and diluted earnings per share for the three months ended June 30, 2012 and 2011 are:

	For the Three Months Ended June 30, 2012
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	49,555	174,830	$	0.28
Dilutive effect of stock options	—		1,083
Diluted earnings per common share	$	49,555	175,913	$	0.28

	For the Three Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	53,603	184,585	$	0.29
Dilutive effect of stock options	—		2,435
Diluted earnings per common share	$	53,603	187,020	$	0.29

Employee stock options to purchase 16,637,000 and 7,675,000 shares of common stock, with an average exercise price of $22.75 and $28.25, were outstanding during the three months ended June 30, 2012 and 2011, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

The calculations of basic and diluted earnings per share for the six months ended June 30, 2012 and 2011 are:

	For the Six Months Ended June 30, 2012
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	99,520	175,589	$	0.57
Dilutive effect of stock options	—		1,202
Diluted earnings per common share	$	99,520	176,791	$	0.56

	For the Six Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	111,331	185,186	$	0.60
Dilutive effect of stock options	—		2,571
Diluted earnings per common share	$	111,331	187,757	$	0.59

Employee stock options to purchase 14,017,000 and 7,606,000 shares of common stock, with an average exercise price of $23.40 and $28.26, were outstanding during the six months ended June 30, 2012 and 2011, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

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Statements of Cash Flows

For purposes of the Consolidated Statements of Cash Flows, the Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents.

The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the six months ended June 30:

	2012			2011
Net income	$	99,974		$	112,153
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	11,062			11,002
Amortization	15,029			13,023
Equity in earnings of unconsolidated affiliate	(50,042		)	(58,479		)
Distributions received from unconsolidated affiliate	47,443			50,760
Stock-based compensation	7,898			7,542
Provision for losses on receivables	(104		)	(327		)
Deferred income tax expense	(1,291		)	(36		)
Net realized gains from investments	(3,869		)	(5,330		)
Change in other long-term liabilities	2,356			1,904
Change in other assets	(916		)	(1,658		)
Other	657			3,858
Change in current asset and liabilities
Decrease (increase) in
Receivables from regulated investment companies	(7,881		)	(1,953		)
Receivables	(26,992		)	(15,353		)
Other current assets	147			(211		)
Increase (decrease) in
Accounts payable	1,851			(1,727		)
Accrued liabilities	(18,810		)	(21,081		)
Deferred revenue	(1,399		)	(1,247		)
Total adjustments	(24,861		)	(19,313		)
Net cash provided by operating activities	$	75,113		$	92,840

Note 2. Investment in Unconsolidated Affiliate

The Company has an investment in the general partnership LSV Asset Management (LSV). LSV is a registered investment advisor that provides investment advisory services to institutions, including pension plans and investment companies. LSV is currently an investment sub-advisor for a small number of SEI-sponsored mutual funds. The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations.

As of December 31, 2011, the Company's total partnership interest in LSV was approximately 41.2 percent. In March 2009, certain partners (the Contributing partners) of LSV, including the Company, designated a portion of their partnership interest for the purpose of providing an interest in the partnership to a select group of key employees. Until such time an interest in the partnership is issued to a key employee, all profits, losses, distributions and other rights and obligations relating to such unissued interests remains with the Contributing partners. Each issuance must be authorized by unanimous vote of all Contributing partners. In April 2012, the Contributing partners agreed to provide certain key employees an interest in LSV, thereby reducing the Company’s interest in LSV to approximately 39.8 percent.

At June 30, 2012, the Company’s total investment in LSV was $63,553. The investment in LSV exceeded the underlying equity in the net assets of LSV by $3,499, of which $3,062 is considered goodwill embedded in the investment. The Company

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receives partnership distributions from LSV on a quarterly basis. The Company received partnership distribution payments from LSV for $47,443 and $50,760 in the six months ended June 30, 2012 and 2011, respectively.

The Company’s proportionate share in the earnings of LSV was $22,712 and $29,530 during the three months ended June 30, 2012 and 2011, respectively. During the six months ended June 30, 2012 and 2011, the Company's proportionate share in the earnings of LSV was $50,042 and $58,479, respectively.

The following table contains the condensed statements of operations of LSV for the three months ended June 30, 2012 and 2011:

	Three Months Ended
	June 30,
	2012		2011
Revenues	$	69,189	$	81,748
Net income	57,372		72,018

The following table contains the condensed statements of operations of LSV for the six months ended June 30, 2012 and 2011:

	Six Months Ended
	June 30,
	2012		2011
Revenues	$	146,654	$	161,150
Net income	124,045		141,964

Guaranty Agreement

In April 2011, LSV Employee Group II, LLC agreed to purchase a partnership interest of an existing LSV employee for $4,300, of which $3,655 was financed through a term loan with Bank of America, N.A. (Bank of America). The Company provided an unsecured guaranty to the lenders of all the obligations of LSV Employee Group II, LLC. The lenders have the right to seek payment from the Company in the event of a default by LSV Employee Group II, LLC. The term loan has a four year term and will be repaid from the quarterly distributions of LSV. LSV Employee Group II made principal payments of $468 during the six months ended June 30, 2012. As of June 30, 2012, the remaining unpaid principal balance of the term loan was $2,729. This amount is not reflected, nor is it required to be reflected, in the Company’s Consolidated Balance Sheet at June 30, 2012.

The Company’s direct interest in LSV is unchanged as a result of this transaction. The Company has determined that LSV Employee Group II is a variable interest entity (VIE); however, the Company is not considered the primary beneficiary because it does not have the power to direct the activities that most significantly impact the economic performance of LSV Employee Group II either directly or through any financial responsibility from the guaranty.

In July 2012, LSV Employee Group II made a principal payment of $272. As of July 31, 2012, the remaining unpaid principal balance of the term loan was $2,457. The Company, in its capacity as guarantor, currently has no obligation of payment relating to the term loan of LSV Employee Group II and, furthermore, fully expects that LSV Employee Group II will meet all of their future obligations regarding the term loan.

Note 3.    Variable Interest Entities – Investment Products

The Company has 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. Clients are the equity investors and participate in proportion to their ownership percentage in the net income and net capital gains 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. Some of the Company’s investment products have been determined to be VIEs at inception.

The Company does not have a significant equity investment in any of the VIEs and does not have an obligation to enter into any guarantee agreements with the VIEs. The Company is not the primary beneficiary of the VIEs because the expected fees and the expected return on any investment into the VIE by the Company relative to the expected returns of the VIE to the equity investor holders does not approach 50 percent of the expected losses or gains of the VIEs. Therefore, the Company is not required to consolidate any investment products that are VIEs into its financial statements. The Company’s variable interest in

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the VIEs, which consists of management fees and in some situations, seed capital, is not considered a significant variable interest.

The risks to the Company associated with its involvement with any of the investment products that are VIEs are limited to the cash flows received from the revenue generated for asset management, administration and distribution services and any equity investments in the VIEs. Both of these items are not significant. The Company has no other financial obligation to the VIEs.

Amounts relating to fees received from the VIEs included in Receivables and amounts relating to equity investments in the VIEs included in Investments Available for Sale on the Company’s Consolidated Balance Sheets are not significant to the total assets of the Company.

Note 4. Composition of Certain Financial Statement Captions

Receivables

Receivables on the accompanying Consolidated Balance Sheets consist of:

	June 30, 2012			December 31, 2011
Trade receivables	$	43,162		$	37,822
Fees earned, not billed	110,853			92,916
Other receivables	15,718			12,295
	169,733			143,033
Less: Allowance for doubtful accounts	(820		)	(924		)
	$	168,913		$	142,109

Fees earned, not billed represents receivables earned but unbilled and results from timing differences between services provided and contractual billing schedules. These billing schedules generally provide for fees to be billed on a quarterly basis. In addition, certain fees earned from investment operations services are determined from security valuations which delay billings to clients.

Receivables from regulated investment companies on the accompanying Consolidated Balance Sheets primarily represent fees receivable for distribution, investment advisory, and administration services to various regulated investment companies sponsored by SEI.

Property and Equipment

Property and Equipment on the accompanying Consolidated Balance Sheets consists of:

	June 30, 2012			December 31, 2011
Buildings	$	137,421		$	136,949
Equipment	65,884			64,256
Land	9,929			9,929
Purchased software	90,580			77,971
Furniture and fixtures	18,245			17,999
Leasehold improvements	4,820			4,558
Construction in progress	108			339
	326,987			312,001
Less: Accumulated depreciation	(191,976		)	(182,453		)
Property and Equipment, net	$	135,011		$	129,548

The Company recognized $11,062 and $11,002 in depreciation expense related to property and equipment for the six months ended June 30, 2012 and 2011, respectively.

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Accrued Liabilities

Accrued liabilities on the accompanying Consolidated Balance Sheets consist of:

	June 30, 2012		December 31, 2011
Accrued employee compensation	$	31,728	$	48,112
Accrued employee benefits and other personnel	5,359		5,408
Accrued consulting, outsourcing and professional fees	16,850		17,477
Accrued brokerage fees	7,586		8,665
Accrued sub-advisory, distribution and other asset management fees	16,657		17,091
Accrued dividend payable	—		26,518
Other accrued liabilities	22,722		23,773
Total accrued liabilities	$	100,902	$	147,044

Note 5.    Fair Value Measurements

The fair value of the Company’s financial assets and liabilities 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 equity and fixed-income mutual funds that are quoted daily. Level 2 financial assets consist of Government National Mortgage Association (GNMA) and other U.S. government agency securities that are single issuer pools that are valued based on current market data for the specific issue owned or pools of similar securities. Level 3 financial assets primarily consist of senior note obligations issued by SIVs. The Company had no Level 3 financial liabilities at June 30, 2012 or December 31, 2011. There were no transfers of financial assets between levels within the fair value hierarchy during the six months ended June 30, 2012.

Valuation of GNMA and Other U.S. Government Agency Securities

All of the Company's GNMA and other U.S. government agency securities are held in accounts at well-established financial institutions that utilize the services of independent pricing vendors. These vendors utilize evaluated and industry accepted pricing models that vary by asset class and incorporate available trade, bid and other market information to determine the fair value of the securities. The market inputs normally used for evaluations of securities, listed in approximate order of priority, include: benchmark yields, reported trade, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data. The Company records the securities at the prices provided by the independent pricing vendor without adjustment.

Valuation of SIV Securities

The underlying collateral of the SIV securities is mainly comprised of asset-backed securities and collateralized debt obligations. The Company utilizes the services of an independent firm that specializes in securities valuations to assist in determining the fair value of the SIV security owned. Given the lack of any reliable market data on the SIV security, the firm utilized a valuation model that employs a net asset approach which considers the value of the underlying collateral of the SIV security to determine its fair value. Management evaluated the value received from the firm and considered other information, such as the existence of any current market activity, to determine the fair value of the SIV securities. As a result of this evaluation, the Company utilized the fair value of the SIV security without adjustment as provided by the independent valuation firm.

The model used by the independent valuation firm to determine the fair value of the SIV security attempts to value the underlying collateral of the SIV security through the use of industry accepted and proprietary valuation techniques and models. This approach combines advanced analytics with real-time market information that incorporate structural and fundamental analysis, collateral characteristics and recent market developments. Each security that makes up the underlying collateral is specifically identified by its CUSIP or ISIN number and is analyzed by using observable collateral characteristics and credit statistics in order to project future performance and expected cash flows for each individual security. The projected cash flows incorporate assumptions and expectations based upon the foregoing analysis of the collateral characteristics such as, but not limited to, default probabilities, recovery rates, prepayment speeds and loss severities. Expected future cash flows are discounted at an appropriate yield derived from the individual security, structural and collateral characteristics, trading levels and other available market data. Different modeling techniques and associated inputs and assumptions may be used to project future cash flows for each security depending upon the asset classification of that individual security (i.e. residential mortgage-backed security, commercial mortgage-backed security, collateralized debt obligations, etc.). The aggregate value of the discounted cash flows of the underlying collateral is compared to the total remaining par value of the collateral to determine the expected recovery price, or fair value, of the remaining note obligations. Other factors may be considered that are specific to the SIV security that may affect the fair value of the SIV security.

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Management may also consider, when available, price quotes from brokers and dealers. If a price quote is available, management will compare this number to the fair value derived from the valuation model of the independent firm giving consideration to other market factors and risk premiums. Given the lack of any significant trading activity for the SIV security owned by the Company, management believes that market prices may not represent the implied fair value of the SIV security owned by the Company.

In the event a market transaction does exist for a SIV security, management evaluates the publicly available information surrounding the transaction in order to assess if the price used represents the fair value for the SIV security. In management’s opinion, the current market for the SIV security does not represent any orderly and efficient market.

The fair value of certain financial assets and liabilities of the Company was determined using the following inputs:

	At June 30, 2012
	Fair Value Measurements at Reporting Date Using
Assets	Total		Quoted Prices in Active  Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Equity available-for-sale securities	$	12,453	$	12,453	$	—	$	—
Fixed income available-for-sale securities	68,785		—		68,785		—
Fixed income securities owned	21,057		—		21,057		—
Trading securities	53,253		3,865		—		49,388
	$	155,548	$	16,318	$	89,842	$	49,388

	At December 31, 2011
	Fair Value Measurements at Reporting Date Using
Assets	Total		Quoted Prices in Active  Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Equity available-for-sale securities	$	8,010	$	8,010	$	—	$	—
Fixed income available-for-sale securities	74,998		—		74,998		—
Fixed income securities owned	20,949		—		20,949		—
Trading securities	56,325		3,702		—		52,623
	$	160,282	$	11,712	$	95,947	$	52,623

The table below presents a reconciliation for all assets and liabilities of the Company measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the period from January 1, 2012 to June 30, 2012:

	Trading Securities
Balance, January 1, 2012	$	52,623
Purchases	—
Issuances	—
Principal prepayments and settlements	(7,176		)
Sales	—
Total gains or (losses) (realized/unrealized):
Included in earnings	3,941
Included in other comprehensive income	—
Transfers in and out of Level 3	—
Balance, June 30, 2012	$	49,388

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The table below presents a reconciliation for all assets and liabilities of the Company measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the period from January 1, 2011 to June 30, 2011:

	Trading Securities
Balance, January 1, 2011	$	100,645
Purchases	—
Issuances	—
Principal prepayments and settlements	(10,806		)
Sales	(34,706		)
Total gains or (losses) (realized/unrealized):
Included in earnings	4,920
Included in other comprehensive income	—
Transfers in and out of Level 3	—
Balance, June 30, 2011	$	60,053

Note 6.    Marketable Securities

Investments Available for Sale

Investments available for sale classified as non-current assets consist of:

	At June 30, 2012
	Cost Amount		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
SEI-sponsored mutual funds	$	12,736	$	11	$	(326	)	$	12,421
Other mutual funds	28		4		—			32
Debt securities	64,309		4,476		—			68,785
	$	77,073	$	4,491	$	(326	)	$	81,238

	At December 31, 2011
	Cost Amount		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
SEI-sponsored mutual funds	$	8,243	$	48	$	(360	)	$	7,931
Other mutual funds	69		10		—			79
Debt securities	70,604		4,394		—			74,998
	$	78,916	$	4,452	$	(360	)	$	83,008

Net unrealized holding gains at June 30, 2012 and December 31, 2011 were $2,593 (net of income tax expense of $1,572) and $2,574 (net of income tax expense of $1,518), respectively. These net unrealized gains are reported as a separate component of Accumulated other comprehensive income on the accompanying Consolidated Balance Sheets.

There were no material gross realized gains or losses from available-for-sale securities during the six months ended June 30, 2012 and 2011. Gains and losses from available-for-sale securities are reflected in Net gain from investments on the accompanying Consolidated Statements of Operations.

The Company’s debt securities classified as available-for-sale securities are issued by GNMA and are backed by the full faith and credit of the U.S. government. These securities were purchased to satisfy applicable regulatory requirements of SEI Private Trust Company (SPTC) and have maturity dates which range from 2020 to 2041.

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Trading Securities

Trading securities of the Company consist of:

	At June 30, 2012
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SIV securities	$	139,188	$	—	$	(91,001	)	$	48,187
LSV-sponsored mutual funds	2,049		1,816		—			3,865
Other investments	1,215		—		(14		)	1,201
	$	142,452	$	1,816	$	(91,015	)	$	53,253

	At December 31, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SIV securities	$	146,363	$	—	$	(94,955	)	$	51,408
LSV-sponsored mutual funds	2,049		1,653		—			3,702
Other investments	1,215		—		—			1,215
	$	149,627	$	1,653	$	(94,955	)	$	56,325

The Company records all of its trading securities on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these securities are recognized in Net gain from investments on the accompanying Consolidated Statements of Operations.

During the six months ended June 30, 2012 and 2011, the Company recognized gains from SIV securities of $3,954 and $4,920, respectively. Of the gains recognized during the six months ended June 30, 2012, $4,463 resulted from cash payments received from the SIV securities offset by losses of $509 which resulted from a decrease in fair value at June 30, 2012. Of the gains recognized during the six months ended June 30, 2011, $6,232 resulted from cash payments received from the SIV securities offset by losses of $1,312 which resulted from a decrease in fair value at June 30, 2011. The net gains from the SIV securities are reflected in Net gain from investments on the accompanying Consolidated Statements of Operations.

In January 2011, the Company sold the senior note obligation originally issued by Stanfield Victoria. There was no gain or loss recognized by the Company from the sale of the note in 2011 as the fair value of the Stanfield Victoria note at December 31, 2010 was not different than the sale price received.

The Company has an investment related to the startup of mutual funds sponsored by LSV. These are U.S. dollar denominated funds that invests primarily in securities of Canadian and Australian 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 net gains (losses) from the change in fair value of the funds during the three and six months ended June 30, 2012 and 2011 were minimal.

Securities Owned

The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency and commercial paper securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings. The securities had a fair value of $21,057 and $20,949 at June 30, 2012 and December 31, 2011, respectively. The net gains (losses) from the change in fair value of the securities during the three and six months ended June 30, 2012 and 2011 were minimal.

Note 7.    Lines of Credit

On February 2, 2012 (the Closing Date), the Company entered into a new five-year $300,000 Credit Agreement (the Credit Facility) with Wells Fargo Bank, National Association, and a syndicate of other lenders. The Credit Facility became available on the Closing Date and replaced the five-year Credit Agreement with JP Morgan Chase Bank, N.A. The Credit Facility is scheduled to expire in February 2017, 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 1.25 percent above LIBOR. There is also a commitment fee equal to 0.15 percent per annum on the daily unused portion of the facility. The aggregate amount of the

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Credit Facility may be increased by an additional $100,000 under certain conditions set forth in the agreement. The Credit Facility contains covenants that restrict the ability of the Company to engage in mergers, consolidations, asset sales, investments, transactions with affiliates, or to incur liens, as defined in the agreement. In the event of a default under the Credit Facility, the Company would also be restricted from paying dividends on, or repurchasing, its common stock without the approval of the lenders. None of the covenants of the Credit Facility negatively affect the Company’s liquidity or capital resources. Both the interest rate and commitment fee prices may increase if the Company’s leverage ratio reaches certain levels. Upon the occurrence of certain financial or economic events, significant corporate events, or certain other events of default constituting an event of default under the Credit Facility, all loans outstanding may be declared immediately due and payable and all commitments under the agreement may be terminated. The Company had no borrowings through the Credit Facility at June 30, 2012. The Company was in compliance with all covenants of the Credit Facility at June 30, 2012.

The Company’s Canadian subsidiary has a credit facility agreement (the Canadian Credit Facility) for the purpose of facilitating the settlement of mutual fund transactions. The Canadian Credit Facility has no stated expiration date. The amount of the facility is limited to $2,000 Canadian dollars or the equivalent amount in U.S. dollars. The Canadian Credit Facility does not contain any covenants which restrict the liquidity or capital resources of the Company. The Company had no borrowings under the Canadian Credit Facility and was in compliance with all covenants during the three months ended June 30, 2012.

Note 8.    Shareholders’ Equity

Stock-Based Compensation

The Company currently has one active equity compensation plan, the 2007 Equity Compensation Plan (the 2007 Plan), which provides for the grant of incentive stock options, non-qualified stock options and stock appreciation rights with respect to up to 20 million shares of common stock of the Company, subject to adjustment for stock splits, reclassifications, mergers and other events. Permitted grantees under the 2007 Plan include employees, non-employee directors and consultants who perform services for the Company. The plan is administered by the Compensation Committee of the Board of Directors of the Company. The Company has only granted non-qualified stock options under the plan. 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 specified diluted earnings per share targets are achieved, and the remaining 50 percent when secondary, higher specified diluted earnings per share targets are achieved. The amount of stock-based compensation expense is based upon management’s estimate of when the earnings per share targets may be achieved.

The Company discontinued any further grants under the Company’s 1998 Equity Compensation Plan (the 1998 Plan) as a result of the approval of the 2007 Plan. No options are available for grant from this plan. Grants made from the 1998 Plan continue in effect under the terms of the grant.

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended June 30, 2012 and 2011, respectively, as follows:

	Three Months Ended
	June 30,
	2012			2011
Stock-based compensation expense	$	3,865		$	3,810
Less: Deferred tax benefit	(1,376		)	(1,427		)
Stock-based compensation expense, net of tax	$	2,489		$	2,383

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the six months ended June 30, 2012 and 2011, respectively, as follows:

	Six Months Ended
	June 30,
	2012			2011
Stock-based compensation expense	$	7,898		$	7,542
Less: Deferred tax benefit	(2,808		)	(2,825		)
Stock-based compensation expense, net of tax	$	5,090		$	4,717

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As of June 30, 2012, there was approximately $41,397 of unrecognized compensation cost remaining, adjusted for estimated forfeitures, related to unvested employee stock options that management expects will vest and is being amortized. The Company estimates that compensation cost will be recognized according to the following schedule:

Period	Stock-Based Compensation Expense
Remainder of 2012	$	7,639
2013	12,715
2014	12,521
2015	3,850
2016	2,359
2017	2,313
	$	41,397

The Company issues new common shares associated with the exercise of stock options. The total intrinsic value of options exercised during the six months ended June 30, 2012 was $4,327. The total options exercisable as of June 30, 2012 had an intrinsic value of $26,977. The total intrinsic value for options exercisable is calculated as the difference between the market value of the Company’s common stock as of June 30, 2012 and the exercise price of the shares. The market value of the Company’s common stock as of June 30, 2012 was $19.89 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of June 30, 2012 was $17.37. Total options that were outstanding and exercisable as of June 30, 2012 were 25,564,000 and 10,712,000, respectively.

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 4,098,000 shares at a total cost of $79,879 during the six months ended June 30, 2012. As of June 30, 2012, the Company has $116,397 of authorization remaining for the purchase of common stock under the program.

The Company immediately retires its common stock when purchased. Upon retirement, the Company reduces Capital in excess of par value for the average capital per share outstanding and the remainder is charged against Retained earnings. If the Company reduces its Retained earnings to zero, any subsequent purchases of common stock will be charged entirely to Capital in excess of par value.

Cash Dividend

OnMay 23, 2012, the Board of Directors declared a cash dividend of $0.15 per share on the Company's common stock, which was paid on June 26, 2012, to shareholders of record on June 18, 2012. Cash dividends declared during the six months ended June 30, 2012 and 2011 were $26,117 and $22,041, respectively.

Noncontrolling Interest

The following table provides a reconciliation of Noncontrolling interest on the Consolidated Balance Sheet for the period from January 1, 2012 to June 30, 2012:

	Noncontrolling interest
Balance, January 1, 2012	$	16,143
Net income attributable to noncontrolling interest	454
Foreign currency translation adjustments	329
Balance, June 30, 2012	$	16,926

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The following table provides a reconciliation of Noncontrolling interest on the Consolidated Balance Sheet for the period from January 1, 2011 to June 30, 2011:

	Noncontrolling interest
Balance, January 1, 2011	$	15,155
Net income attributable to noncontrolling interest	822
Foreign currency translation adjustments	925
Balance, June 30, 2011	$	16,902

Note 9.    Accumulated Comprehensive Income

Accumulated other comprehensive income, net of tax, consists of:

	Foreign Currency Translation Adjustments			Unrealized Holding Gains (Losses) on Investments		Accumulated Other Comprehensive Income
Total accumulated comprehensive income at December 31, 2011	$	(2,043	)	$	2,574	$	531
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2011	1,369			—		1,369
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2011	$	(674	)	$	2,574	$	1,900
Total comprehensive income for the six months ended June 30, 2012	$	547		$	19	$	566
Less: Total comprehensive income attributable to noncontrolling interest for the six months ended June 30, 2012	(329		)	—		(329		)
Total comprehensive income attributable to SEI Investments Company for the six months ended June 30, 2012	$	218		$	19	$	237
Total accumulated comprehensive income at June 30, 2012	$	(1,496	)	$	2,593	$	1,097
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at June 30, 2012	1,040			—		1,040
Total accumulated comprehensive income attributable to SEI Investments Company at June 30, 2012	$	(456	)	$	2,593	$	2,137

Note 10.    Business Segment Information

The Company’s reportable business segments are:

Private Banks – provides investment processing and investment management programs to banks and trust institutions worldwide, independent wealth advisers located in the United Kingdom, and financial advisors in Canada;

Investment Advisors – provides investment management programs to affluent investors through a network of independent registered investment advisors, financial planners, and other investment professionals in the United States;

Institutional Investors – provides investment management programs and administrative outsourcing solutions to retirement plan sponsors, hospitals, and not-for-profit organizations worldwide;

Investment Managers – provides investment operations outsourcing solutions to investment managers, fund companies and banking institutions located in the United States, and to investment managers worldwide of alternative asset classes such as hedge funds, funds of hedge funds, and private equity funds across both registered and partnership structures; and

Investments in New Businesses – provides investment management programs to ultra-high-net-worth families residing in the United States through the SEI Wealth Network^® and conducts other research and development activities.

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The information in the following tables is derived from the Company’s internal financial reporting used for corporate management purposes. There are no inter-segment revenues for the three and six months ended June 30, 2012 and 2011. 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, 2011.

The following tables highlight certain unaudited financial information about each of the Company’s business segments for the three months ended June 30, 2012 and 2011.

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Three Months Ended June 30, 2012
Revenues	$	88,303		$	49,375		$	55,895		$	46,713		$	951		$	241,237
Expenses	84,886			29,025			28,740			30,163			3,684			176,498
Operating profit (loss)	$	3,417		$	20,350		$	27,155		$	16,550		$	(2,733	)	$	64,739
Operating margin	4		%	41		%	49		%	35		%	N/A			27		%

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Three Months Ended June 30, 2011
Revenues	$	87,873		$	49,768		$	54,731		$	44,452		$	936		$	237,760
Expenses	86,274			27,734			27,406			29,282			2,920			173,616
Operating profit (loss)	$	1,599		$	22,034		$	27,325		$	15,170		$	(1,984	)	$	64,144
Operating margin	2		%	44		%	50		%	34		%	N/A			27		%

A reconciliation of the total reported for the business segments to income from operations in the Consolidated Statements of Operations for the three months ended June 30, 2012 and 2011 is as follows:

	2012			2011
Total operating profit from segments above	$	64,739		$	64,144
Corporate overhead expenses	(11,080		)	(10,720		)
Noncontrolling interest reflected in segments	139			533
Income from operations	$	53,798		$	53,957

The following tables provide additional information for the three months ended June 30, 2012 and 2011 pertaining to our business segments:

	Capital Expenditures					Depreciation
	2012		2011			2012		2011
Private Banks	$	8,180	$	6,783		$	3,704	$	3,962
Investment Advisors	2,805		2,296			492		556
Institutional Investors	636		251			251		268
Investment Managers	1,110		89			492		435
Investments in New Businesses	148		92			490		29
Total from business segments	$	12,879	$	9,511		$	5,429	$	5,250
Corporate Overhead	286		(24		)	201		141
	$	13,165	$	9,487		$	5,630	$	5,391

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	Amortization
	2012		2011
Private Banks	$	4,794	$	4,608
Investment Advisors	1,757		1,551
Institutional Investors	302		196
Investment Managers	201		131
Investments in New Businesses	296		65
Total from business segments	$	7,350	$	6,551
Corporate Overhead	57		241
	$	7,407	$	6,792

The following tables highlight certain unaudited financial information about each of the Company’s business segments for the six months ended June 30, 2012 and 2011.

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Six Months Ended June 30, 2012
Revenues	$	176,291		$	98,843		$	109,212		$	92,924		$	1,865		$	479,135
Expenses	172,403			58,326			56,840			60,589			7,382			355,540
Operating profit (loss)	$	3,888		$	40,517		$	52,372		$	32,335		$	(5,517	)	$	123,595
Operating margin	2		%	41		%	48		%	35		%	N/A			26		%

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Six Months Ended June 30, 2011
Revenues	$	174,582		$	97,876		$	107,916		$	87,893		$	1,986		$	470,253
Expenses	168,677			54,774			54,359			57,281			6,045			341,136
Operating profit (loss)	$	5,905		$	43,102		$	53,557		$	30,612		$	(4,059	)	$	129,117
Operating margin	3		%	44		%	50		%	35		%	N/A			27		%

A reconciliation of the total reported for the business segments to income from operations in the Consolidated Statements of Operations for the six months ended June 30, 2012 and 2011 is as follows:

	2012			2011
Total operating profit from segments above	$	123,595		$	129,117
Corporate overhead expenses	(22,162		)	(21,368		)
Noncontrolling interest reflected in segments	454			805
Income from operations	$	101,887		$	108,554

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The following tables provide additional information for the six months ended June 30, 2012 and 2011 pertaining to our business segments:

	Capital Expenditures				Depreciation
	2012		2011		2012		2011
Private Banks	$	20,022	$	17,813	$	7,432	$	8,000
Investment Advisors	6,946		6,038		986		1,147
Institutional Investors	1,867		1,132		513		560
Investment Managers	4,163		1,873		968		938
Investments in New Businesses	420		304		824		59
Total from business segments	$	33,418	$	27,160	$	10,723	$	10,704
Corporate Overhead	1,140		350		339		298
	$	34,558	$	27,510	$	11,062	$	11,002

	Amortization
	2012		2011
Private Banks	$	9,479	$	8,837
Investment Advisors	3,473		2,969
Institutional Investors	604		363
Investment Managers	402		246
Investments in New Businesses	573		124
Total from business segments	$	14,531	$	12,539
Corporate Overhead	498		484
	$	15,029	$	13,023

Note 11.    Income Taxes

The gross liability for unrecognized tax benefits at June 30, 2012 and December 31, 2011 was $11,547 and $9,410, respectively, exclusive of interest and penalties, of which $9,974 and $8,320 would affect the effective tax rate if the Company were to recognize the tax benefit.

The Company classifies interest and penalties on unrecognized tax benefits as income tax expense. As of June 30, 2012 and December 31, 2011, the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $853 and $634, respectively.

	June 30, 2012		December 31, 2011
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$	11,547	$	9,410
Interest and penalties on unrecognized benefits	853		634
Total gross uncertain tax positions	$	12,400	$	10,044
Amount included in Current liabilities	$	1,768	$	1,768
Amount included in Other long-term liabilities	10,632		8,276
	$	12,400	$	10,044

The Company’s effective tax rates were 36.6 percent and 34.7 percent for the three months ended June 30, 2012 and 2011, respectively. For the six months ended June 30, 2012 and 2011, the Company's tax rates were 36.9 percent and 36.0 percent, respectively. The 2011 tax rate reflects a benefit for research and development tax credit whereas the 2012 tax rate did not reflect any benefit. Additionally, during the three months ended June 30, 2011, management determined the Company was eligible for the Domestic Production Activities Deduction. The effective rate in the three months ended June 30, 2011 reflects the benefit of this deduction for both 2011 and 2010, whereas the 2012 tax rate only reflects the 2012 benefit.

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

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2007 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2006.

The Company estimates it will recognize $1,768 of unrecognized tax benefits within the next twelve months due to the expiration of the statute of limitations and resolution of income tax audits. These unrecognized tax benefits are related to tax positions taken on certain federal, state, and foreign tax returns. However, the timing of the resolution of income tax examinations is highly uncertain, and the amounts ultimately paid, if any, upon resolution of the issues raised by the taxing authorities may differ materially from the amounts accrued for each year. While it is reasonably possible that some issues under examination could be resolved in the next twelve months, based upon the current facts and circumstances, the Company cannot reasonably estimate the timing of such resolution or total range of potential changes as it relates to the current unrecognized tax benefits that are recorded as part of the Company’s financial statements.

Note 12.    Commitments and Contingencies

In the normal course of business, the Company is party to various claims and legal proceedings.

One of SEI’s principal subsidiaries, SIDCO, has been named as a defendant in certain putative class action complaints (the Complaints) related to leveraged exchange traded funds (ETFs) advised by ProShares Advisors, LLC. The first complaint was filed on August 5, 2009. To date, the Complaints have been filed in the United States District Court for the Southern District of New York and in the United States District Court for the District of Maryland. The three complaints filed in the District of Maryland have been voluntarily dismissed by the plaintiffs. Two of them were subsequently re-filed in the Southern District of New York. Two of the complaints filed in the Southern District of New York have also been voluntarily dismissed by plaintiffs. The Complaints are purportedly made on behalf of all persons that purchased or otherwise acquired shares in various ProShares leveraged ETFs pursuant or traceable to allegedly false and misleading registration statements, prospectuses and statements of additional information. The Complaints name as defendants ProShares Advisors, LLC; ProShares Trust; ProShares Trust II, SIDCO, and various officers and trustees to ProShares Advisors, LLC; ProShares Trust and ProShares Trust II. The Complaints allege that SIDCO was the distributor and principal underwriter for the various ProShares leveraged ETFs that were distributed to authorized participants and ultimately shareholders. The complaints allege that the registration statements for the ProShares ETFs were materially false and misleading because they failed adequately to describe the nature and risks of the investments. The Complaints allege that SIDCO is liable for these purportedly material misstatements and omissions under Section 11 of the Securities Act of 1933. The Complaints seek unspecified compensatory and other damages, reasonable costs and other relief. Defendants have moved to consolidate the complaints, which motion has been granted. The Court appointed lead plaintiff on July 13, 2010, and an amended consolidated class action complaint was filed on September 25, 2010 asserting substantially the same claims. Defendants moved to dismiss on November 15, 2010. On December 16, 2010, lead plaintiff informed the Court and Defendants that lead plaintiff elected to file a second amended consolidated complaint, which was filed on January 31, 2011. Defendants filed a motion to dismiss the second complaint on March 17, 2011. Oral argument on this motion was held on February 2, 2012. While the outcome of this litigation is uncertain given its early phase, SEI believes that it has valid defenses to plaintiffs’ claims and intends to defend the lawsuits vigorously.

SEI has been named in six lawsuits filed in Louisiana. Five lawsuits were filed in the 19th Judicial District Court for the Parish of East Baton Rouge, State of Louisiana. One of the five actions purports to set forth claims on behalf of a class and also names SPTC as a defendant. Two of the other actions also name SPTC as a defendant. All five actions name various defendants in addition to SEI, and, in all five actions, the plaintiffs purport to bring a cause of action under the Louisiana Securities Act. The putative class action originally included a claim against SEI and SPTC for an alleged violation of the Louisiana Unfair Trade Practices Act. Two of the other five actions include claims for violations of the Louisiana Racketeering Act and possibly conspiracy. In addition, another group of plaintiffs have filed a lawsuit in the 23rd Judicial District Court for the Parish of Ascension, State of Louisiana, against SEI and SPTC and other defendants asserting claims of negligence, breach of contract, breach of fiduciary duty, violations of the uniform fiduciaries law, negligent misrepresentation, detrimental reliance, violations of the Louisiana Securities Act and Louisiana Racketeering Act and conspiracy. The underlying allegations in all the actions are purportedly related to the role of SPTC in providing back-office services to Stanford Trust Company. The petitions allege that SEI and SPTC aided and abetted or otherwise participated in the sale of “certificates of deposit” issued by Stanford International Bank. Two of the five actions filed in East Baton Rouge have been removed to federal court, and plaintiffs’ motions to remand are pending. These two cases have been transferred by the Judicial Panel on Multidistrict Litigation to United States District Court for the Northern District of Texas. On August 31, 2011, the United States District Court for the Northern District of Texas issued an order and judgment that the causes of action alleged against SEI and SPTC in the two remanded actions were preempted by federal law and the Court dismissed these cases with prejudice. The Court of Appeals for the Fifth Circuit granted an expedited appeal of the United States District Court’s order and judgment. The appeal was briefed, and oral argument was held on February 7, 2012. On March 19, 2012, a panel of the Court of Appeals for the Fifth Circuit reversed the decision of the United States District Court and remanded the actions for further proceedings. On April 2, 2012, SEI filed with the United States Court of Appeals for the Fifth Circuit a petition for rehearing en banc of the panel’s opinion. On April 19, 2012, the Fifth Circuit Court of Appeals denied the petition for rehearing.

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The case filed in Ascension Parish was also removed to federal court and transferred by the Judicial Panel on Multidistrict Litigation to the Northern District of Texas. The schedule for responding to that complaint has not yet been established. The plaintiffs in the remaining two cases in East Baton Rouge have granted SEI an extension to respond to the filings. SEI and SPTC filed exceptions in the putative class action pending in East Baton Rouge, which the Court granted in part and dismissed the claims under the Louisiana Unfair Trade Practices Act and denied in part as to the other exceptions. SEI and SPTC filed an answer to the East Baton Rouge putative class action; plaintiffs filed a motion for class certification; and SEI and SPTC also filed a motion for summary judgment against certain named plaintiffs which the Court stated will not be set for hearing until after the hearing on the class certification motion. Following the decision by the United States District Court for the Northern District of Texas, the Court in the East Baton Rouge action issued an order staying the proceedings in the East Baton Rouge class action pending the outcome of the appeal of the order and judgment of the United States District Court for the Northern District of Texas. Following the panel opinion of the Court of Appeals on March 19, 2012, the Court in the East Baton Rouge action scheduled a hearing on class certification for September 20, 2012. On July 18, 2012, the Company filed a petition for certiorari in the United States Supreme Court, seeking review of the decision by the United States Court of Appeals for the Eleventh Circuit to permit the claims against SEI to proceed. The Company believes that the trial court correctly concluded that the claims against SEI were barred by the federal Securities Litigation Uniform Standards Act and is requesting that the Supreme Court reinstate that dismissal. While the outcome of this litigation is uncertain given its early phase, SEI and SPTC believe that they have valid defenses to plaintiffs’ claims and intend to defend the lawsuits vigorously.

Because of the uncertainty of the make-up of the classes, the specific theories of liability that may survive a motion to dismiss, the 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.

Note 13.    Subsequent Events

On July 31, 2012, the Company, MetLife International Holdings, Inc. (MetLife) and International Finance Corporation (IFC) entered into a definitive agreement with Baring Asset Management Limited to sell all ownership interests in SEI Asset Korea Co., Ltd. (SEI AK). SEI AK is located in South Korea and provides domestic equity and fixed income investment management services to financial institutions and pension funds. Consummation of the acquisition of SEI AK under the definitive agreement is subject to regulatory approvals and other customary closing conditions.

The Company's ownership interest in SEI AK is 56.1 percent as of July 31, 2012. The Company consolidates the assets, liabilities and operations of SEI AK in its Consolidated Financial Statements. The ownership interests in SEI AK for MetLife and IFC is reflected in Noncontrolling interest in the Consolidated Financial Statements. Upon closing of the agreement, the then current cash balance of SEI AK will be distributed to the Company, Metlife and IFC in accordance with the ownership interests.

As of June 30, 2012, SEI AK has total corporate assets of $48,776, of which $42,553 is included in Cash and Cash equivalents on the Consolidated Balance Sheets. All other accounts of SEI AK are not material to any financial statement line item in the Consolidated Financial Statements.

The Company did not provide U.S. deferred taxes on the undistributed earnings of SEI AK since its inception because those earnings were considered to be indefinitely reinvested. As a result of the potential sale of SEI AK, the Company no longer considers undistributed earnings to be indefinitely reinvested and, therefore, must accrue approximately $5,000 for U.S. deferred taxes during the three months ended September 30, 2012 on the cumulative undistributed earnings of SEI AK.

If the requisite regulatory approvals are obtained, the other conditions to closing are satisfied or waived and the transaction is consummated, then the Company expects to recognize a net after tax gain on the sale of its shares of SEI AK depending upon revenue during a pre-closing measurement period and specified revenues during three one-year periods after the closing.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

(In thousands, except asset balances and per share data)

This discussion reviews and analyzes the consolidated financial condition at June 30, 2012 and 2011, the consolidated results of operations for the three and six months ended June 30, 2012 and 2011 and other key factors that may affect future performance. This discussion should be read in conjunction with the Consolidated Financial Statements and the Notes to the Consolidated Financial Statements.

Overview

Consolidated Summary

We are a leading global provider of investment processing, investment management, and investment operations solutions. We help corporations, financial institutions, financial advisors, and ultra-high-net-worth families create and manage wealth by providing comprehensive, innovative, investment and investment-business solutions. Investment processing fees are earned as monthly fees for contracted services, including computer processing services, software licenses, and investment operations services, as well as transaction-based fees for providing securities valuation and trade-execution. Investment operations and investment management fees are earned as a percentage of average assets under management or administration. As of June 30, 2012, through our subsidiaries and partnerships in which we have a significant interest, we manage or administer $424.0 billion in mutual fund and pooled or separately managed assets, including $181.7 billion in assets under management and $242.3 billion in client assets under administration. Our affiliate, LSV Asset Management (LSV), manages $54.9 billion of assets which are included as assets under management.

Our Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2012 and 2011 were:

	Three Months Ended June 30,						Percent		Six Months Ended June 30,						Percent
	2012			2011			Change		2012			2011			Change
Revenues	$	241,237		$	237,760		1	%	$	479,135		$	470,253		2	%
Expenses	187,439			183,803			2	%	377,248			361,699			4	%
Income from operations	53,798			53,957			—	%	101,887			108,554			(6	)%
Net gain from investments	664			(1,948		)	(134	)%	3,869			5,330			(27	)%
Interest income, net of interest expense	1,327			1,281			4	%	2,653			2,621			1	%
Equity in earnings from unconsolidated affiliate	22,712			29,530			(23	)%	50,042			58,479			(14	)%
Income before income taxes	78,501			82,820			(5	)%	158,451			174,984			(9	)%
Income taxes	28,762			28,707			—	%	58,477			62,831			(7	)%
Net income	49,739			54,113			(8	)%	99,974			112,153			(11	)%
Less: Net income attributable to noncontrolling interest	(184		)	(510		)	(64	)%	(454		)	(822		)	(45	)%
Net income attributable to SEI Investments Co.	$	49,555		$	53,603		(8	)%	99,520			$	111,331		(11	)%
Diluted earnings per common share	$	0.28		$	0.29		(3	)%	$	0.56		$	0.59		(5	)%

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In our opinion, the following items had a significant impact on our financial results for the three and six months ended June 30, 2012 and 2011:

• Revenue growth was primarily driven by higher Asset management, administration and distribution fees from improved cash flows from new and existing clients and market appreciation in 2012 despite the market decline in the second quarter. Our average assets under management, excluding LSV, increased $8.5 billion, or seven percent, to $125.4 billion in the first six months of 2012 as compared to $116.9 billion during the first six months of 2011.

• New business in our Institutional Investors and Investment Managers segments contributed to our growth in revenues. Additionally, asset funding from existing clients for our hedge fund solutions and increased accounts for our separately managed accounts solutions in our Investment Managers segment also served to drive revenue growth.

• Our proportionate share in the earnings of LSV in the first six months of 2012 was $50.0 million, as compared to $58.5 million in the first six months of 2011, a decrease of 14 percent. Despite the favorable market conditions in late 2011 and first quarter 2012, LSV’s revenues decreased due to the market decline in second quarter 2012 which resulted in a net decline in the value of assets under management. LSV’s average assets under management were $57.6 billion during the first six months of 2012, as compared to $62.6 billion during the first six months of 2011, a decrease of eight percent. Our earnings from LSV were also negatively impacted by a decrease in our ownership percentage from approximately 41.2 percent to approximately 39.8 percent during the second quarter 2012. The reduction in our ownership percentage is described in greater detail under the caption "Equity in earnings of unconsolidated affiliate" later in this discussion.

• Our operating expenses related to servicing new and existing clients of our Global Wealth Services solution implemented on the Global Wealth Platform increased during the first six months of 2012 as compared to the first six months of 2011 as we continue to build out the operational infrastructure. These increased operational costs, mainly related to personnel, primarily impacted the Private Banks and Investment Advisors segments. The increased operational costs are included in Compensation, benefits and other personnel on the accompanying Consolidated Statements of Operations.

• Our costs incurred for the development of the Global Wealth Platform, excluding amounts capitalized, have declined during the first six months of 2012 as compared to the first six months of 2011 as we transition our efforts from development to support and maintenance of the platform. These development costs, which are expensed as incurred, are included in Consulting, outsourcing and professional fees on the accompanying Consolidated Statements of Operations.

• Our operating expenses related to our hedge fund and separately managed accounts solutions of our Investment Managers segment increased during the first six months of 2012 as compared to the first six months of 2011. These increased operational costs, mainly related to personnel, resulted from servicing new and existing clients and are also included in Compensation, benefits and other personnel on the accompanying Consolidated Statements of Operations.

• Sales events, net of client losses, were significantly higher during the first six months of 2012. These sales events resulted in an increase in sales compensation expense of $4.6 million when compared to the first six months of 2011.

• We recognized gains of $1.1 million and $4.0 million from SIV securities in the three and six months ended June 30, 2012, respectively, as compared to losses of $1.9 million and gains of $4.9 million in the prior year periods.

• We continued our stock repurchase program during 2012 and purchased 4,098,000 shares at an average price of approximately $19.50 per share in the six month period.

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Ending Asset Balances

(In millions)

This table presents ending assets of our clients, or of our clients’ customers, for which we provide management or administrative services through our subsidiaries and partnerships in which we have a significant interest. These assets are not included in our balance sheets because we do not own them.

	As of June 30,				Percent
	2012		2011		Change
Private Banks:
Equity and fixed income programs	$	16,848	$	16,720	1	%
Collective trust fund programs	335		504		(34	)%
Liquidity funds	5,063		4,918		3	%
Total assets under management	$	22,246	$	22,142	—	%
Client proprietary assets under administration	10,719		10,994		(3	)%
Total assets	$	32,965	$	33,136	(1	)%
Investment Advisors:
Equity and fixed income programs	29,153		28,410		3	%
Collective trust fund programs	705		1,499		(53	)%
Liquidity funds	1,880		1,651		14	%
Total assets under management	$	31,738	$	31,560	1	%
Institutional Investors:
Equity and fixed income programs	55,548		51,180		9	%
Collective trust fund programs	415		482		(14	)%
Liquidity funds	2,958		3,146		(6	)%
Total assets under management	$	58,921	$	54,808	8	%
Investment Managers:
Equity and fixed income programs	61		50		22	%
Collective trust fund programs	13,004		10,372		25	%
Liquidity funds	226		179		26	%
Total assets under management	$	13,291	$	10,601	25	%
Client proprietary assets under administration (A)	231,549		238,432		(3	)%
Total assets	$	244,840	$	249,033	(2	)%
Investments in New Businesses:
Equity and fixed income programs	551		558		(1	)%
Liquidity funds	30		41		(27	)%
Total assets under management	$	581	$	599	(3	)%
LSV:
Equity and fixed income programs	$	54,922	$	60,626	(9	)%
Consolidated:
Equity and fixed income programs	157,083		157,544		—	%
Collective trust fund programs	14,459		12,857		12	%
Liquidity funds	10,157		9,935		2	%
Total assets under management	$	181,699	$	180,336	1	%
Client proprietary assets under administration	242,268		249,426		(3	)%
Total assets under management and administration	$	423,967	$	429,762	(1	)%

(A) Client assets under administration in the Investment Managers segment include $38.4 billion and $52.2 billion of assets at June 30, 2012 and 2011, respectively, that require limited services and therefore are at fee levels below our normal full service assets.

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Average Asset Balances

(In millions)

This table presents average asset balances of our clients, or of clients’ customers, for which we provide management or administrative services through our subsidiaries and partnerships in which we have a significant interest. These assets are not included in our balance sheets because we do not own them.

	Three Months Ended June 30,				Percent		Six Months Ended June 30,				Percent
	2012		2011		Change		2012		2011		Change
Private Banks:
Equity and fixed income programs	$	16,794	$	16,176	4	%	$	16,955	$	15,173	12	%
Collective trust fund programs	396		543		(27	)%	416		568		(27	)%
Liquidity funds	5,115		4,909		4	%	5,348		4,984		7	%
Total assets under management	$	22,305	$	21,628	3	%	$	22,719	$	20,725	10	%
Client proprietary assets under administration	10,631		11,114		(4	)%	10,421		11,018		(5	)%
Total assets	$	32,936	$	32,742	1	%	$	33,140	$	31,743	4	%
Investment Advisors:
Equity and fixed income programs	29,103		28,502		2	%	28,765		28,172		2	%
Collective trust fund programs	984		1,544		(36	)%	1,111		1,616		(31	)%
Liquidity funds	1,806		1,576		15	%	1,911		1,578		21	%
Total assets under management	$	31,893	$	31,622	1	%	$	31,787	$	31,366	1	%
Institutional Investors:
Equity and fixed income programs	54,998		51,567		7	%	53,634		50,980		5	%
Collective trust fund programs	418		554		(25	)%	423		581		(27	)%
Liquidity funds	3,147		3,515		(10	)%	3,456		3,467		—	%
Total assets under management	$	58,563	$	55,636	5	%	$	57,513	$	55,028	5	%
Investment Managers:
Equity and fixed income programs	63		38		66	%	61		20		205	%
Collective trust fund programs	12,991		9,560		36	%	12,487		8,924		40	%
Liquidity funds	235		165		42	%	212		187		13	%
Total assets under management	$	13,289	$	9,763	36	%	$	12,760	$	9,131	40	%
Client proprietary assets under administration	229,873		241,423		(5	)%	227,210		239,400		(5	)%
Total assets	$	243,162	$	251,186	(3	)%	$	239,970	$	248,531	(3	)%
Investments in New Businesses:
Equity and fixed income programs	550		561		(2	)%	550		570		(4	)%
Liquidity funds	33		42		(21	)%	36		52		(31	)%
Total assets under management	$	583	$	603	(3	)%	$	586	$	622	(6	)%
LSV:
Equity and fixed income programs	$	55,994	$	63,000	(11	)%	$	57,597	$	62,606	(8	)%
Consolidated:
Equity and fixed income programs	157,502		159,844		(1	)%	157,562		157,521		—	%
Collective trust fund programs	14,789		12,201		21	%	14,437		11,689		24	%
Liquidity funds	10,336		10,207		1	%	10,963		10,268		7	%
Total assets under management	$	182,627	$	182,252	—	%	$	182,962	$	179,478	2	%
Client proprietary assets under administration	240,504		252,537		(5	)%	237,631		250,418		(5	)%
Total assets under management and administration	$	423,131	$	434,789	(3	)%	$	420,593	$	429,896	(2	)%

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In the preceding tables, assets under management are total assets of our clients or their customers invested in our equity and fixed-income investment programs, collective trust fund programs, and liquidity funds for which we provide asset management services. Assets under management and administration also include total assets of our clients or their customers for which we provide administrative services, including client proprietary fund balances for which we provide administration and/or distribution services.

Business Segments

Revenues, Expenses and Operating Profit (Loss) for our business segments for the three and six months ended June 30, 2012 compared to the three and six months ended June 30, 2011 were as follows:

	Three Months Ended June 30,						Percent Change		Six Months Ended June 30,						Percent Change
	2012			2011					2012			2011
Private Banks:
Revenues	$	88,303		$	87,873		—	%	$	176,291		$	174,582		1	%
Expenses	84,886			86,274			(2	)%	172,403			168,677			2	%
Operating Profit	$	3,417		$	1,599		114	%	$	3,888		$	5,905		(34	)%
Operating Margin	4		%	2		%			2		%	3		%
Investment Advisors:
Revenues	$	49,375		$	49,768		(1	)%	$	98,843		$	97,876		1	%
Expenses	29,025			27,734			5	%	58,326			54,774			6	%
Operating Profit	$	20,350		$	22,034		(8	)%	$	40,517		$	43,102		(6	)%
Operating Margin	41		%	44		%			41		%	44		%
Institutional Investors:
Revenues	$	55,895		$	54,731		2	%	$	109,212		$	107,916		1	%
Expenses	28,740			27,406			5	%	56,840			54,359			5	%
Operating Profit	$	27,155		$	27,325		(1	)%	$	52,372		$	53,557		(2	)%
Operating Margin	49		%	50		%			48		%	50		%
Investment Managers:
Revenues	$	46,713		$	44,452		5	%	$	92,924		$	87,893		6	%
Expenses	30,163			29,282			3	%	60,589			57,281			6	%
Operating Profit	$	16,550		$	15,170		9	%	$	32,335		$	30,612		6	%
Operating Margin	35		%	34		%			35		%	35		%
Investments in New Businesses:
Revenues	$	951		$	936		2	%	$	1,865		$	1,986		(6	)%
Expenses	3,684			2,920			26	%	7,382			6,045			22	%
Operating Loss	$	(2,733	)	$	(1,984	)	38	%	$	(5,517	)	$	(4,059	)	36	%
Operating Margin	N/A			N/A					N/A			N/A

For additional information pertaining to our business segments, see Note 10 to the Consolidated Financial Statements.

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Private Banks

	Three Months Ended June 30,				Percent Change		Six Months Ended June 30,				Percent Change
	2012		2011				2012		2011
Revenues:
Information processing and software servicing fees	$	56,785	$	55,587	2	%	$	112,537	$	111,033	1	%
Asset management, administration & distribution fees	25,071		25,311		(1	)%	50,180		49,229		2	%
Transaction-based and trade execution fees	6,447		6,975		(8	)%	13,574		14,320		(5	)%
Total revenues	$	88,303	$	87,873	—	%	$	176,291	$	174,582	1	%

Revenues increased slightly in the three and six month periods ended June 30, 2012 and were primarily affected by:

• Increased investment management fees in the six month period from existing international clients due to higher average assets under management from improved capital markets in late 2011 into the first quarter of 2012; partially offset by

• Lower recurring investment processing fees due to price reductions provided to existing clients that recontracted for longer periods, client losses and lower transaction volumes.

Operating margins increased to four percent compared to two percent in the three month period. Operating income increased by $1.8 million, or 114 percent, in the three month period and was primarily affected by:

• An increase in revenues;

• Lower direct costs associated with third party service providers during the second quarter 2012; partially offset by

• Increased sales compensation expense due to new business activity; and

• Increased direct expenses associated with increased investment management fees from existing international clients, mainly distribution fees.

Operating margins decreased to two percent compared to three percent in the six month period. Operating income decreased by $2.0 million, or 34 percent, in the six month period and was primarily affected by:

• Increased direct expenses associated with increased investment management fees from existing international clients, mainly distribution fees;

• Increased sales compensation expense due to new business activity;

• Increased non-capitalized development costs, mainly personnel costs, and amortization expense relating to the Global Wealth Platform; and

• Increased operational costs, mainly personnel costs, for servicing new and existing Global Wealth Services clients implemented onto the Global Wealth Platform; partially offset by

• An increase in revenues.

Investment Advisors

Revenues decreased slightly in the three month period and increased slightly in the six month period ended June 30, 2012 and were primarily affected by:

• Increased investment management fees in the six month period from existing clients due to higher average assets under management caused by improved capital markets in late 2011 and through the first quarter of 2012 and an increase in net cash flows from new and existing advisors; partially offset by

• Decreased investment management fees in the three month period due to the planned closure of the SEI Stable Asset Fund, a collective trust fund product.

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Operating margins decreased to 41 percent compared to 44 percent in both the three and six month periods. Operating income decreased by $1.7 million, or eight percent, in the three month period and $2.6 million, or six percent, in the six month period and was primarily affected by:

• Increased non-capitalized development costs and amortization expense relating to the Global Wealth Platform as well as spending associated with building the necessary functionality and infrastructure for servicing financial institutions and investment advisors in the United States;

• Increased sales compensation expense due to new business activity; and

• Increased one-time termination costs; partially offset by

• An increase in revenues.

Institutional Investors

Revenues increased $1.2 million, or two percent, in the three month period and increased $1.3 million, or one percent, in the six month period ended June 30, 2012 and were primarily affected by:

• Increased investment management fees from existing clients due to higher average assets under management caused by improved capital markets in late 2011 and through the first quarter of 2012 as well as additional asset funding from existing clients; and

• Asset funding from new sales of our retirement and not-for-profit solutions; partially offset by

• Client losses and lower basis points earned on assets under management.

Operating margins decreased to 49 percent compared to 50 percent in the three month period and decreased to 48 percent compared to 50 percent in the six month period. Operating income decreased slightly in the three month period and decreased $1.2 million, or two percent, in the six month period and was primarily affected by:

• Increased sales compensation expense due to new business activity and other personnel costs, mainly salary; and

• Increased discretionary marketing and promotion expenses; partially offset by

• An increase in revenues.

Investment Managers

Revenues increased $2.3 million, or five percent, in the three month period and increased $5.0 million, or six percent, in the six month period ended June 30, 2012 and were primarily affected by:

• Cash flows from new clients of our hedge funds and collective trust fund solutions; partially offset by client losses;

• Net positive cash flows from existing hedge fund clients due to new funding along with higher valuations from capital market increases in late 2011 and through the first quarter of 2012; and

• Increased accounts from our separately managed account program due to new clients and existing clients involved in mergers.

Operating margins increased to 35 percent compared to 34 percent in the three month period and remained at 35 percent in the six month period. Operating income increased $1.4 million, or nine percent, in the three month period and increased $1.7 million, or six percent, in the six month period and was primarily affected by:

• An increase in revenues; partially offset by

• Increased personnel expenses, technology and other operational costs to service new clients of our hedge fund and separately managed accounts solutions.

Other

Other income and expense items on the accompanying Consolidated Statements of Operations consists of:

	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Net gain (loss) from investments	$	664		$	(1,948	)	$	3,869		$	5,330
Interest and dividend income	1,440			1,436			2,927			2,980
Interest expense	(113		)	(155		)	(274		)	(359		)
Equity in earnings of unconsolidated affiliate	22,712			29,530			50,042			58,479
Total other income and expense items, net	$	24,703		$	28,863		$	56,564		$	66,430

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Net gain (loss) from investments

Net gain (loss) from investments consists of:

	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Gains (Losses) from SIV securities	$	1,072		$	(1,944	)	$	3,954		$	4,920
Net realized and unrealized gains (losses) from marketable securities	(408		)	(4		)	211			410
Other losses	—			—			(296		)	—
Net gain (loss) from investments	$	664		$	(1,948	)	$	3,869		$	5,330

During the six months ended June 30, 2012, we recognized gains of $4.0 million from SIV securities, of which $4.5 million resulted from cash payments received from the SIV securities offset by losses of $0.5 million which resulted from a decrease in fair value at June 30, 2012.

During the six months ended June 30, 2011, we recognized gains of $4.9 million from SIV securities, of which $6.2 million resulted from cash payments received from the SIV securities offset by losses of $1.3 million which resulted from a decrease in fair value at June 30, 2011. In addition, we sold the senior note obligation originally issued by Stanfield Victoria. There was no gain or loss recognized from the sale of the note as the fair value of the Stanfield Victoria note at December 31, 2010 was not different than the sale price received.

Interest and dividend income

Interest and dividend income is earned based upon the amount of cash that is invested daily and the average yield earned on those balances.

Interest expense

Interest expense primarily includes fees related to our credit facility.

Equity in earnings of unconsolidated affiliate

Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statement of Operations includes our less than 50 percent ownership in LSV. During the six months ended June 30, 2011, our partnership interest in LSV was approximately 41.2 percent. In March 2009, certain partners of LSV, including SEI, agreed to designate a portion of their partnership interest for the purpose of providing an interest in the partnership to a select group of key LSV employees. In April 2012, these contributing partners agreed to provide certain key LSV employees an interest in LSV thereby reducing our interest in LSV to approximately 39.8 percent.

Our proportionate share in the earnings of LSV was $22.7 million in second quarter 2012 as compared to $29.5 million in second quarter 2011, a decrease of 23 percent. Our proportionate share in the earnings of LSV was $50.0 million in the six months ended June 30, 2012 as compared to $58.5 million in the six months ended June 30, 2011, a decrease of 14 percent. The reductions in our earnings from LSV were due to lower assets under management from market depreciation in second quarter 2012 and the decline in our partnership interest. LSV’s average assets under management decreased $5.0 billion to $57.6 billion during the six months ended June 30, 2012 as compared to $62.6 billion during the six months ended June 30, 2011, a decrease of eight percent.

Noncontrolling interest

Noncontrolling interest includes the interest of other shareholders in a joint venture of the Company in an asset management firm located in South Korea.

Income Taxes

Our effective tax rates were 36.6 percent and 34.7 percent for the three months ended June 30, 2012 and 2011, respectively. For the six months ended June 30, 2012 and 2011, our effective tax rates were 36.9 percent and 36.0 percent, respectively. The 2011 tax rate reflects a benefit for research and development tax credit whereas the 2012 tax rate did not reflect any benefit. Additionally, during the three months ended June 30, 2011, we determined SEI was eligible for the Domestic Production Activities Deduction. The effective rate in the three months ended June 30, 2011 reflects the benefit of this deduction for both 2011 and 2010, whereas the 2012 tax rate only reflects the 2012 benefit.

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Fair Value Measurements

The fair value of our financial assets and liabilities is determined in accordance with the fair value hierarchy. The fair value of most of our financial assets are determined using Level 1 or Level 2 inputs and consist mainly of investments in equity or fixed-income mutual funds that are quoted daily and Government National Mortgage Association (GNMA) and other U.S. government agency securities that are single issuer pools that are valued based on current market data of similar assets. Our Level 3 financial assets consist mainly of SIV securities (See Note 5 to the Notes to Consolidated Financial Statements).

Liquidity and Capital Resources

	Six Months Ended June 30,
	2012			2011
Net cash provided by operating activities	$	75,113		$	92,840
Net cash (used in) provided by investing activities	(28,198		)	1,341
Net cash used in financing activities	(120,407		)	(148,162		)
Net decrease in cash and cash equivalents	(73,492		)	(53,981		)
Cash and cash equivalents, beginning of period	420,986			496,292
Cash and cash equivalents, end of period	$	347,494		$	442,311

Cash requirements and liquidity needs are primarily funded through our cash flow from operations and our capacity for additional borrowing. At June 30, 2012, our unused sources of liquidity consisted of cash and cash equivalents and the amount available under our credit facility.

In February 2012, we replaced our credit facility with a new five-year credit facility agreement which provides for borrowings of up to $300.0 million (See Note 7 to the Consolidated Financial Statements). The new credit facility is a senior unsecured revolving line of credit with Wells Fargo Bank, National Association, and a syndicate of other lenders and is scheduled to expire in February 2017. The availability of the new credit facility is subject to the compliance with certain covenants set forth in the agreement. The credit facility contains covenants which restrict our ability 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, we would also be restricted from paying dividends on, or repurchasing, our common stock. Currently, our ability to borrow from the credit facility is not limited by any covenant of the agreement. We currently have no borrowings under the new credit facility.

The majority of our excess cash reserves are primarily placed in accounts located in the United States that invest entirely in SEI-sponsored money market mutual funds denominated in the U.S. dollar. We also utilize demand deposit accounts or money market accounts at several well-established financial institutions located in the United States. Accounts used to manage these excess cash reserves do not impose any restrictions or limitations that would prevent us from being able to access such cash amounts immediately. As of July 31, 2012, the amount of cash and cash equivalents considered free and immediately accessible for other general corporate purposes was $227.0 million.

Our cash and cash equivalents include accounts managed by our subsidiaries and minority-owned subsidiaries that are used in their operations or to cover specific business and regulatory requirements. The availability of this cash for other purposes beyond the operations of these subsidiaries may be limited. Also, some of our foreign subsidiaries may have excess cash reserves which are considered to be undistributed earnings and indefinitely reinvested. Upon distribution of these earnings, in the form of dividends or otherwise, we would be immediately subject to both U.S. and foreign withholding taxes which would reduce the amount we would ultimately realize. We do not include accounts of our foreign subsidiaries in our calculation of free and immediately accessible cash for other general corporate purposes.

Cash flows from operations decreased $17.7 million in the first six months of 2012 compared to the first six months of 2011 due to the decline in net income and the net change in our working capital accounts, primarily from the change in the balances of receivables.

Cash flows from investing activities decreased $29.5 million in the first six months of 2012 compared to the first six months of 2011. Net cash used in investing activities includes:

• Purchases, sales and maturities of marketable securities. We had cash outflows of $13.8 million for the purchase of marketable securities in the first six months of 2012 as compared to $36.6 million in the first six months of 2011. Marketable securities purchased in 2012 and 2011 consisted of investments for the start-up of new investment products and investments in short-term U.S. government agency and commercial paper securities by SIDCO.

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Purchases of marketable securities in the first six months of 2011 include $20.0 million of short-term U.S. government agency and commercial paper securities to initiate SIDCO’s investment program. We had cash inflows of $22.9 million from sales and maturities of marketable securities in the first six months of 2012 as compared to $60.5 million in the first six months of 2011. Marketable securities sold in 2011 primarily includes the proceeds from the sales of SIV securities. Cash inflows from maturities and prepayments of marketable securities were $22.2 million in the first six months of 2012 as compared to $23.1 million in the first six months of 2011.

• The capitalization of costs incurred in developing computer software. We will continue the development of the Global Wealth Platform through a series of releases to expand the functionality of the platform. We capitalized $18.2 million of software development costs in the first six months of 2012 as compared to $20.5 million in the first six months of 2011. Amounts capitalized in 2012 and 2011 include costs for significant enhancements and upgrades to the platform.

• Capital expenditures. Our capital expenditures in the first six months of 2012 primarily include purchased software. Our capital expenditures in the first six months of 2011 primarily include equipment for our data center operations.

Cash flows from financing activities increased $27.8 million in the first six months of 2012 compared to the first six months of 2011. Net cash used in financing activities includes:

• The repurchase of our common stock. Our Board of Directors has authorized the repurchase of our common stock through multiple authorizations. Currently, there is no expiration date for our common stock repurchase program. We spent approximately $80.9 million during the first six months of 2012 and $94.1 million during the first six months of 2011 for the repurchase of our common stock.

• Dividend payments. Cash dividends paid were $52.6 million or $.30 per share in the first six months of 2012 and $22.0 million or $.12 per share in the first six months of 2011. The increase in dividends paid in 2012 was due to the payment date of the December 2010 dividend occurring in the calendar year as compared to the payment date of the dividend declared in December 2011 which occurred in January 2012.

• Principal payments of our debt. Principal payments in the first six months of 2011 include payments of $55.0 million to reduce the outstanding debt associated with our credit facility. We fully repaid the outstanding balance of our credit facility in 2011 and had no debt during the first six months of 2012.

We believe our operating cash flow, available borrowing capacity, and existing cash and cash equivalents should provide adequate funds for ongoing operations; continued investment in new products and equipment; our common stock repurchase program and future dividend payments.

Subsequent Event

On July 31, 2012, SEI, MetLife International Holdings, Inc. (MetLife) and International Finance Corporation (IFC) entered into a definitive agreement with Baring Asset Management Limited to sell all ownership interests in SEI Asset Korea Co., Ltd. (SEI AK). SEI AK is located in South Korea and provides domestic equity and fixed income investment management services to financial institutions and pension funds. SEI AK manages approximately KRW 7.3 trillion ($6.4 billion) as of June 30, 2012. Consummation of the acquisition of SEI AK under the definitive agreement is subject to regulatory approvals and other customary closing conditions.

Our ownership interest in SEI AK is currently 56.1 percent. We consolidate the assets, liabilities and operations of SEI AK in our Consolidated Financial Statements. The ownership interests in SEI AK for MetLife and IFC is reflected in Noncontrolling interest in our Consolidated Financial Statements. Upon closing of the agreement, the then current cash balance of SEI AK will be distributed to SEI, Metlife and IFC in accordance with the ownership interests.

As of June 30, 2012, SEI AK has total corporate assets of $48.8 million, of which $42.6 million is included in Cash and Cash equivalents on the Consolidated Balance Sheets. All other accounts of SEI AK are not material to any financial statement line item in the Consolidated Financial Statements.

We did not provide U.S. deferred taxes on the undistributed earnings of SEI AK since its inception because we considered those earnings to be indefinitely reinvested. As a result of the potential sale of SEI AK, we no longer consider the undistributed earnings to be indefinitely reinvested and, therefore, will accrue approximately $5.0 million in U.S. deferred taxes on the cumulative undistributed earnings of SEI AK during the third quarter 2012. Due to this transaction, our third quarter 2012 tax rate is expected to be between 41.0 percent and 42.0 percent, reflecting the additional accrued taxes of approximately $5.0 million.

If the requisite regulatory approvals are obtained, the other conditions to closing are satisfied or waived and the transaction is consummated, we expect the net after tax gain on the sale of our shares of SEI AK to range from approximately $8.9 million to $20.6 million depending upon revenue during a pre-closing measurement period and specified revenues during three one-year periods after the closing.

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Forward-Looking Information and Risk Factors

The Private Securities Litigation Reform Act of 1995 provides a “safe harbor” for forward-looking statements. Certain information contained in this discussion is or may be considered forward-looking. Forward-looking statements relate to future operations, strategies, financial results or other developments. Forward-looking statements are based upon estimates and assumptions that involve certain risks and uncertainties, many of which are beyond our control or are subject to change. Although we believe our assumptions are reasonable, they could be inaccurate. Our actual future revenues and income could differ materially from our expected results. We have no obligation to publicly update or revise any forward-looking statements.

Among the risks and uncertainties which may affect our future operations, strategies, financial results or other developments are those risks described in our latest Annual Report on Form 10-K in Part I, Item 1A. These risks include the following:

• changes in capital markets that may affect our revenues and earnings;

• product development risk;

• consolidation within our target markets, including consolidations between banks and other financial institutions;

• risk of failure by a third-party service provider;

• the performance of the funds we manage;

• the affect of extensive governmental regulation;

• systems and technology risks;

• data security risks;

• third party approval of our investment products with advisors affiliated with independent broker-dealers or other networks;

• operational risks associated with the processing of investment transactions;

• changes in, or interpretation of, accounting principles or tax rules and regulations;

• fluctuations in foreign currency exchange rates; and

• retention of senior management personnel.

SEI is a savings and loan holding company subject to supervision and regulation by the Federal Reserve. SEI is not subject to specific statutory capital requirements. However, SEI is required to maintain capital that is sufficient to support the holding company and its subsidiaries’ business activities, and the risks inherent in those activities. In June 2012, the Federal Reserve issued three notices of proposed rulemaking (NPR) which would establish an integrated regulatory capital framework that addresses shortcomings in regulatory capital requirements that became apparent during the recent financial crisis. We are currently evaluating the impact on SEI from these proposed rules; however, we do not anticipate the impact from the application of the proposed rules to have a significant impact on the operations or business of SEI.

Our principal, regulated wholly-owned subsidiaries are SEI Investments Distribution Co., or SIDCO, SEI Investments Management Corporation, or SIMC, SEI Private Trust Company, or SPTC, SEI Trust Company, or STC, and SEI Investments (Europe) Limited, or SIEL. SIDCO is a broker-dealer registered with the SEC under the Securities and Exchange Act of 1934 and is a member of the Financial Industry Regulatory Authority, Inc. (FINRA). SIMC is an investment advisor registered with the SEC under the Investment Advisers Act of 1940. SPTC is a limited purpose federal thrift chartered and regulated by the Office of the Comptroller of the Currency. STC is a Pennsylvania trust company, regulated by the Pennsylvania Department of Banking. SIEL is an investment manager and financial institution subject to regulation by the Financial Services Authority of the United Kingdom. In addition, various SEI subsidiaries are subject to the jurisdiction of regulatory authorities in Canada, the Republic of Ireland and other foreign countries. The Company has a minority ownership interest in LSV, which is also an investment advisor registered with the SEC.

The Company, its regulated subsidiaries, their regulated services and solutions and their customers are all subject to extensive legislation, regulation and supervision that recently has been subject to, and continues to experience, significant change and increased regulatory activity. These changes and regulatory activities could have a material adverse affect on us and our clients.

The various governmental agencies and self-regulatory authorities that regulate or supervise the Company and various of its subsidiaries have broad administrative powers. In the event of a failure to comply with laws, regulations and requirements of these agencies and authorities, the possible sanctions that may be imposed include the suspension of individual employees, limitations on our ability to engage in business for specified periods of time, the revocation of applicable registration as a broker-dealer, investment advisor or other regulated entity, and, as the case may be, censures and fines. Additionally, certain securities and banking laws applicable to us and our subsidiaries provide for certain private rights of action that could give rise to civil litigation. Any litigation could have significant financial and non-financial consequences including monetary judgments and the requirement to take action or limit activities that could ultimately affect our business.

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Governmental scrutiny from regulators, legislative bodies and law enforcement agencies with respect to matters relating to our regulated subsidiaries and their activities, services and solutions, our business practices, our past actions and other matters has increased dramatically in the past several years. Responding to these examinations, investigations, actions and lawsuits, regardless of the ultimate outcome of the proceeding, is time consuming and expensive and can divert the time and effort of our senior management from our business. Penalties and fines sought by regulatory authorities have increased substantially over the last several years, and certain regulators have been more likely in recent years to commence enforcement actions or to advance or support legislation targeted at the financial services industry. Governmental scrutiny and legal and enforcement proceedings can also have a negative impact on our reputation and on the morale and performance of our employees, which could adversely affect our businesses and results of operations.

We are subject to the USA PATRIOT Act of 2001, which contains anti-money laundering and financial transparency laws and requires implementation of regulations applicable to financial services companies, including standards for verifying client identification and monitoring client transactions and detecting and reporting suspicious activities. Anti-money laundering laws outside the United States contain similar requirements.

We offer investment and banking solutions that also are subject to regulation by the federal and state securities and banking authorities, as well as foreign regulatory authorities, where applicable. Existing or future regulations that affect these solutions could lead to a reduction in sales of these solutions or require modifications of these solutions.

Compliance with existing and future regulations and responding to and complying with recent increased regulatory activity affecting broker-dealers, investment advisors, investment companies, financial institutions and their service providers could have a significant impact on us. We periodically undergo regulatory examinations and respond to regulatory inquiries and document requests. In addition, recent legislative activity in the United States (including the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 and attendant rule making activities) and in other jurisdictions (including the European Union and the United Kingdom) have made and continue to make, extensive changes to the laws regulating financial services firms. As a result of these examinations, inquiries and requests, as a result of increased civil litigation activity, and as a result of these new laws and regulations, we engage legal counsel, review our compliance procedures, solution and service offerings, and business operations, and make changes as we deem necessary. These additional activities and required changes may result in increased expense or may reduce revenues.

Our bank clients are subject to supervision by federal and state banking authorities concerning the manner in which such clients purchase and receive our products and services. Our plan sponsor clients and our subsidiaries providing services to those clients are subject to supervision by the Department of Labor and compliance with employee benefit regulations. Investment advisor and broker-dealer clients are regulated by the SEC, state securities authorities, or FINRA. Existing or future regulations applicable to our clients may affect our clients’ purchase of our products and services.

In addition, see the discussion of governmental regulations in Item 1A “Risk Factors” in our latest Annual Report on Form 10-K for a description of the risks that proposed regulatory changes may present for our business.

Item 3.Quantitative and Qualitative Disclosures About Market Risk.

Information regarding our market risk exposures appears in Part II – Item 7A of our Annual Report on Form 10-K for the year ended December 31, 2011. There have been no material changes in our market risk exposures from those disclosed in our Annual Report on Form 10-K for 2011.

Item 4. Controls and Procedures.

(a) Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures as of the end of the period covered by this report. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures as of the end of the period covered by this report are effective in ensuring that information required to be disclosed by us in reports filed under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by an issuer in the reports that it files or submits under the Act is accumulated and communicated to the issuer’s management including its principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure. A controls system, no matter how well designed and operated, cannot provide absolute assurance that the objectives of the controls systems are met, and no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within a company have been detected.

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(b) Change in Internal Control over Financial Reporting

No change in our internal control over financial reporting occurred during the quarter ended June 30, 2012 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1. Legal Proceedings.

One of SEI’s principal subsidiaries, SIDCO, has been named as a defendant in certain putative class action complaints (the Complaints) related to leveraged exchange traded funds (ETFs) advised by ProShares Advisors, LLC. The first complaint was filed on August 5, 2009. To date, the Complaints have been filed in the United States District Court for the Southern District of New York and in the United States District Court for the District of Maryland. The three complaints filed in the District of Maryland have been voluntarily dismissed by the plaintiffs. Two of them were subsequently re-filed in the Southern District of New York. Two of the complaints filed in the Southern District of New York have also been voluntarily dismissed by plaintiffs. The Complaints are purportedly made on behalf of all persons that purchased or otherwise acquired shares in various ProShares leveraged ETFs pursuant or traceable to allegedly false and misleading registration statements, prospectuses and statements of additional information. The Complaints name as defendants ProShares Advisors, LLC; ProShares Trust; ProShares Trust II, SIDCO, and various officers and trustees to ProShares Advisors, LLC; ProShares Trust and ProShares Trust II. The Complaints allege that SIDCO was the distributor and principal underwriter for the various ProShares leveraged ETFs that were distributed to authorized participants and ultimately shareholders. The complaints allege that the registration statements for the ProShares ETFs were materially false and misleading because they failed adequately to describe the nature and risks of the investments. The Complaints allege that SIDCO is liable for these purportedly material misstatements and omissions under Section 11 of the Securities Act of 1933. The Complaints seek unspecified compensatory and other damages, reasonable costs and other relief. Defendants have moved to consolidate the complaints, which motion has been granted. The Court appointed lead plaintiff on July 13, 2010, and an amended consolidated class action complaint was filed on September 25, 2010 asserting substantially the same claims. Defendants moved to dismiss on November 15, 2010. On December 16, 2010, lead plaintiff informed the Court and Defendants that lead plaintiff elected to file a second amended consolidated complaint, which was filed on January 31, 2011. Defendants filed a motion to dismiss the second complaint on March 17, 2011. Oral argument on this motion was held on February 2, 2012. While the outcome of this litigation is uncertain given its early phase, SEI believes that it has valid defenses to plaintiffs’ claims and intends to defend the lawsuits vigorously.

SEI has been named in six lawsuits filed in Louisiana. Five lawsuits were filed in the 19th Judicial District Court for the Parish of East Baton Rouge, State of Louisiana. One of the five actions purports to set forth claims on behalf of a class and also names SPTC as a defendant. Two of the other actions also name SPTC as a defendant. All five actions name various defendants in addition to SEI, and, in all five actions, the plaintiffs purport to bring a cause of action under the Louisiana Securities Act. The putative class action originally included a claim against SEI and SPTC for an alleged violation of the Louisiana Unfair Trade Practices Act. Two of the other five actions include claims for violations of the Louisiana Racketeering Act and possibly conspiracy. In addition, another group of plaintiffs have filed a lawsuit in the 23rd Judicial District Court for the Parish of Ascension, State of Louisiana, against SEI and SPTC and other defendants asserting claims of negligence, breach of contract, breach of fiduciary duty, violations of the uniform fiduciaries law, negligent misrepresentation, detrimental reliance, violations of the Louisiana Securities Act and Louisiana Racketeering Act and conspiracy. The underlying allegations in all the actions are purportedly related to the role of SPTC in providing back-office services to Stanford Trust Company. The petitions allege that SEI and SPTC aided and abetted or otherwise participated in the sale of “certificates of deposit” issued by Stanford International Bank. Two of the five actions filed in East Baton Rouge have been removed to federal court, and plaintiffs’ motions to remand are pending. These two cases have been transferred by the Judicial Panel on Multidistrict Litigation to United States District Court for the Northern District of Texas. On August 31, 2011, the United States District Court for the Northern District of Texas issued an order and judgment that the causes of action alleged against SEI and SPTC in the two remanded actions were preempted by federal law and the Court dismissed these cases with prejudice. The Court of Appeals for the Fifth Circuit granted an expedited appeal of the United States District Court’s order and judgment. The appeal was briefed, and oral argument was held on February 7, 2012. On March 19, 2012, a panel of the Court of Appeals for the Fifth Circuit reversed the decision of the United States District Court and remanded the actions for further proceedings. On April 2, 2012, SEI filed with the United States Court of Appeals for the Fifth Circuit a petition for rehearing en banc of the panel’s opinion. On April 19, 2012, the Fifth Circuit Court of Appeals denied the petition for rehearing.

The case filed in Ascension Parish was also removed to federal court and transferred by the Judicial Panel on Multidistrict Litigation to the Northern District of Texas. The schedule for responding to that complaint has not yet been established. The plaintiffs in the remaining two cases in East Baton Rouge have granted SEI an extension to respond to the filings. SEI and SPTC filed exceptions in the putative class action pending in East Baton Rouge, which the Court granted in part and dismissed the claims under the Louisiana Unfair Trade Practices Act and denied in part as to the other exceptions. SEI and SPTC filed an answer to the East Baton Rouge putative class action; plaintiffs filed a motion for class certification; and SEI and SPTC also filed a motion for summary judgment against certain named plaintiffs which the Court stated will not be set for hearing until

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after the hearing on the class certification motion. Following the decision by the United States District Court for the Northern District of Texas, the Court in the East Baton Rouge action issued an order staying the proceedings in the East Baton Rouge class action pending the outcome of the appeal of the order and judgment of the United States District Court for the Northern District of Texas. Following the panel opinion of the Court of Appeals on March 19, 2012, the Court in the East Baton Rouge action scheduled a hearing on class certification for September 20, 2012. On July 18, 2012, the Company filed a petition for certiorari in the United States Supreme Court, seeking review of the decision by the United States Court of Appeals for the Eleventh Circuit to permit the claims against SEI to proceed. The Company believes that the trial court correctly concluded that the claims against SEI were barred by the federal Securities Litigation Uniform Standards Act and is requesting that the Supreme Court reinstate that dismissal. While the outcome of this litigation is uncertain given its early phase, SEI and SPTC believe that they have valid defenses to plaintiffs’ claims and intend to defend the lawsuits vigorously.

Because of the uncertainty of the make-up of the classes, the specific theories of liability that may survive a motion to dismiss, the 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.

Item 1A. Risk Factors

Information regarding risk factors appears in Part I – Item 1A of the Company’s Annual Report on Form 10-K for the year ended December 31, 2011. The description of the risk factor regarding product development risk in our Annual Report on Form 10-K for the year ended December 31, 2011 has been modified to the following:

We are exposed to product development risk. We continually strive to increase revenues and meet our customers' needs by introducing new products and services. As a result, we are subject to product development risk, which may result in loss if we are unable to develop and deliver fully functional products to our target markets that address our clients' needs and that are developed on a timely basis and reflect an attractive value proposition. The majority of our product development risk pertains to our Global Wealth Platform (GWP). GWP is our newest technology that serves both European and U.S. clients. It is designed to drive our entry into the European private bank and wealth services markets and expand our U.S. market opportunity, improve client experience capabilities and strengthen operating efficiencies by providing straight through business processing solutions and transform the front, middle and back office operations that exist today. New product development is primarily for the purpose of enhancing our competitive position in the industry. In the event that we fail to develop products or services at an acceptable cost or on a timely basis or if we fail to deliver functional products and services which are of sound, economic value to our clients and our target markets, or an inability to support the product in a cost-effective manner, we could suffer significant financial loss.

In addition to the risk factors described in our Annual Report on Form 10-K for the year ended December 31, 2011, we are also subject to the following risk factor:

We are subject to financial and non-financial covenants which may restrict our ability to manage liquidity needs. Our $300 million five-year senior unsecured revolving credit facility (Credit Facility) contains financial and non-financial covenants. The non-financial covenants include restrictions on indebtedness, mergers and acquisitions, sale of assets and investments. In the event of default, we have restrictions on paying dividends and repurchasing our common stock. We have one financial covenant, the Leverage Ratio, which restricts the level of indebtedness we can incur to a maximum of 1.75 times earnings before interest, taxes, depreciation and amortization (EBITDA). We believe our primary risk is with the financial covenant if we were to incur significant unexpected losses that would impact the EBITDA calculation. This would increase the Leverage Ratio and restrict the amount we could borrow under the Credit Facility. A restriction on our ability to fully utilize our Credit Facility may negatively affect our operating results, liquidity and financial condition.

There have been no other material changes in our risk factors from those disclosed in our Annual Report on Form 10-K for 2011.

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Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

(e) Our Board of Directors has authorized the repurchase of up to $2.028 billion worth of our common stock through multiple authorizations. Currently, there is no expiration date for our common stock repurchase program.

Information regarding the repurchase of common stock during the three months ended June 30, 2012 is as follows:

Period	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Program	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Program
April 1 – 30, 2012	—	$	—	—	$	58,562,000
May 1 – 31, 2012	975,000	18.71		975,000	140,321,000
June 1 – 30, 2012	1,275,000	18.76		1,275,000	116,397,000
Total	2,250,000	18.74		2,250,000

Item 6. Exhibits.

The following is a list of exhibits filed as part of the Form 10-Q.

31.1	Rule 13a-15(e)/15d-15(e) Certification of Chief Executive Officer.
31.2	Rule 13a-15(e)/15d-15(e) Certification of Chief Financial Officer.
32	Section 1350 Certifications.
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

39 of 40

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		SEI INVESTMENTS COMPANY
Date:	August 2, 2012	By:	/s/ Dennis J. McGonigle
			Dennis J. McGonigle
			Chief Financial Officer

40 of 40

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Alfred P. West, Jr., certify that:

1. I have reviewed this quarterly report on Form 10-Q of SEI Investments Company;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent function):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial data and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls over financial reporting.

Date: August 2, 2012

/s/ Alfred P. West, Jr.

Alfred P. West, Jr.

Chairman and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Dennis J. McGonigle, certify that:

1. I have reviewed this quarterly report on Form 10-Q of SEI Investments Company;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent function):

a) All significant deficiencies and material weaknesses in the design or operation of internal controls over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial data and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls over financial reporting.

Date: August 2, 2012

/s/ Dennis J. McGonigle

Dennis J. McGonigle

Chief Financial Officer

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF

THE SARBANES-OXLEY ACT OF 2002

I, Alfred P. West, Jr., Chairman and Chief Executive Officer, and I, Dennis J. McGonigle, Chief Financial Officer, of SEI Investments Company, a Pennsylvania corporation (the “Company”), hereby certify that, to my knowledge:

(1) The Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2012 (the “Form 10-Q”) fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934; and

(2) The information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	August 2, 2012	Date:	August 2, 2012
/s/ Alfred P. West, Jr.		/s/ Dennis J. McGonigle
Alfred P. West, Jr.		Dennis J. McGonigle
Chairman and Chief Executive Officer		Chief Financial Officer

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

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Composition Of Certain Financial Statement Captions (Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Composition Of Certain Financial Statement Captions [Abstract]
Accrued employee compensation	$ 31,728	$ 48,112
Accrued employee benefits and other personnel	5,359	5,408
Accrued consulting, outsourcing and professional fees	16,850	17,477
Accrued brokerage fees	7,586	8,665
Accrued sub-advisory, distribution and other asset management fees	16,657	17,091
Accrued dividend payable	0	26,518
Other accrued liabilities	22,722	23,773
Total accrued liabilities	$ 100,902	$ 147,044

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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Capital Expenditures	$ 13,165	$ 9,487	$ 34,558	$ 27,510
Depreciation	5,630	5,391	11,062	11,002
Amortization	7,407	6,792	15,029	13,023
Private Banks [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	8,180	6,783	20,022	17,813
Depreciation	3,704	3,962	7,432	8,000
Amortization	4,794	4,608	9,479	8,837
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	2,805	2,296	6,946	6,038
Depreciation	492	556	986	1,147
Amortization	1,757	1,551	3,473	2,969
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	636	251	1,867	1,132
Depreciation	251	268	513	560
Amortization	302	196	604	363
Investment Managers [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	1,110	89	4,163	1,873
Depreciation	492	435	968	938
Amortization	201	131	402	246
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	148	92	420	304
Depreciation	490	29	824	59
Amortization	296	65	573	124
Total From Business Segments [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	12,879	9,511	33,418	27,160
Depreciation	5,429	5,250	10,723	10,704
Amortization	7,350	6,551	14,531	12,539
Corporate Overhead [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	286	(24)	1,140	350
Depreciation	201	141	339	298
Amortization	$ 57	$ 241	$ 498	$ 484

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Shareholders' Equity (Stock-Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 3,865	$ 3,810	$ 7,898	$ 7,542
Less: Deferred tax benefit	(1,376)	(1,427)	(2,808)	(2,825)
Stock-based compensation expense, net of tax	$ 2,489	$ 2,383	$ 5,090	$ 4,717

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Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Income Tax Uncertainties [Abstract]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 11,547		$ 11,547		$ 9,410
Unrecognized tax benefits that would affect effective tax rate	9,974		9,974		8,320
Interest and penalties on unrecognized benefits	853		853		634
Effective tax rates	36.60%	34.70%	36.90%	36.00%
Unrecognized tax benefits within the next twelve months	$ 1,768		$ 1,768

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Lines Of Credit (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012
Line of Credit Facility [Line Items]
Credit Agreement, years	five
Credit facility	$ 300,000
Credit facility, expiration date	2/2/2017
Credit facility interest accrued, percentage above LIBOR	1.25%
Credit facility, commitment fee per annum on daily unused portion, percent	0.15%
Aggregate amount that may increase under credit facility	100,000
Line of Credit Facility, Amount Outstanding	0
Canadian Subsidiary [Member]
Line of Credit Facility [Line Items]
Credit facility	2,000
Line of Credit Facility, Amount Outstanding	$ 0

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Summary Of Significant Accounting Policies (Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Accounting Policies [Abstract]
Net income	$ 49,739	$ 54,113	$ 99,974	$ 112,153
Depreciation	5,630	5,391	11,062	11,002
Amortization	7,407	6,792	15,029	13,023
Equity in earnings of unconsolidated affiliate	(22,712)	(29,530)	(50,042)	(58,479)
Distributions received from unconsolidated affiliate			47,443	50,760
Stock-based compensation	3,865	3,810	7,898	7,542
Provision for Doubtful Accounts			(104)	(327)
Deferred income tax expense			(1,291)	(36)
Net realized gains from investments			(3,869)	(5,330)
Change in other long-term liabilities			2,356	1,904
Change in other assets			(916)	(1,658)
Other			657	3,858
Decrease (increase) in receivables from regulated investment companies			(7,881)	(1,953)
Decrease (increase) in Receivables			(26,992)	(15,353)
Decrease (increase) in Other current assets			147	(211)
Increase (decrease) in Accounts payable			1,851	(1,727)
Increase (decrease) in Accrued liabilities			(18,810)	(21,081)
Increase (decrease) in Deferred revenue			(1,399)	(1,247)
Total adjustments			(24,861)	(19,313)
Net cash provided by operating activities			$ 75,113	$ 92,840

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Subsequent Events (Narrative) (Details) (USD $) In Thousands, unless otherwise specified					1 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010	Jul. 31, 2012 SEI Asset Korea [Member]	Jun. 30, 2012 SEI Asset Korea [Member]
Subsequent Event [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Sale of Interest by Parent					56.10%
Assets	$ 1,264,862	$ 1,294,559				$ 48,776
Cash and Cash Equivalents, at Carrying Value	$ 347,494	$ 420,986	$ 442,311	$ 496,292		$ 42,553

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value, by Balance Sheet Grouping, Methodology and Assumptions [Abstract]

Fair Value Of Certain Financial Assets And Liabilities

The fair value of certain financial assets and liabilities of the Company was determined using the following inputs:

	At June 30, 2012
	Fair Value Measurements at Reporting Date Using
Assets	Total		Quoted Prices in Active  Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Equity available-for-sale securities	$	12,453	$	12,453	$	—	$	—
Fixed income available-for-sale securities	68,785		—		68,785		—
Fixed income securities owned	21,057		—		21,057		—
Trading securities	53,253		3,865		—		49,388
	$	155,548	$	16,318	$	89,842	$	49,388

	At December 31, 2011
	Fair Value Measurements at Reporting Date Using
Assets	Total		Quoted Prices in Active  Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Equity available-for-sale securities	$	8,010	$	8,010	$	—	$	—
Fixed income available-for-sale securities	74,998		—		74,998		—
Fixed income securities owned	20,949		—		20,949		—
Trading securities	56,325		3,702		—		52,623
	$	160,282	$	11,712	$	95,947	$	52,623

Reconciliation For All Assets And Liabilities Of The Company Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)

The table below presents a reconciliation for all assets and liabilities of the Company measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the period from January 1, 2012 to June 30, 2012:

	Trading Securities
Balance, January 1, 2012	$	52,623
Purchases	—
Issuances	—
Principal prepayments and settlements	(7,176		)
Sales	—
Total gains or (losses) (realized/unrealized):
Included in earnings	3,941
Included in other comprehensive income	—
Transfers in and out of Level 3	—
Balance, June 30, 2012	$	49,388

The table below presents a reconciliation for all assets and liabilities of the Company measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the period from January 1, 2011 to June 30, 2011:

	Trading Securities
Balance, January 1, 2011	$	100,645
Purchases	—
Issuances	—
Principal prepayments and settlements	(10,806		)
Sales	(34,706		)
Total gains or (losses) (realized/unrealized):
Included in earnings	4,920
Included in other comprehensive income	—
Transfers in and out of Level 3	—
Balance, June 30, 2011	$	60,053

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Shareholders' Equity (Schedule Of Reconciliation Of Noncontrolling Interest On The Consolidated Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance			$ 16,143	$ 15,155
Net income attributable to noncontrolling interest	184	510	454	822
Foreign currency translation adjustments			329	925
Ending balance	$ 16,926	$ 16,902	$ 16,926	$ 16,902

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Fair Value Measurements (Reconciliation For All Assets And Liabilities Of The Company Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance, January 1	$ 52,623	$ 100,645
Purchases	0	0
Issuances	0	0
Principal prepayments and settlements	(7,176)	(10,806)
Sales	0	(34,706)
Total gains or (losses) (realized/unrealized), Included in earnings	3,941	4,920
Total gains or (losses) (realized/unrealized), Included in other comprehensive income	0	0
Transfers in and out of Level 3	0	0
Ending balance	$ 49,388	$ 60,053

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Composition Of Certain Financial Statement Captions (Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Composition Of Certain Financial Statement Captions [Abstract]
Trade receivables	$ 43,162	$ 37,822
Fees earned, not billed	110,853	92,916
Other receivables	15,718	12,295
Gross receivables	169,733	143,033
Less: Allowance for doubtful accounts	(820)	(924)
Receivables, net	$ 168,913	$ 142,109

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Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Revenues	$ 241,237	$ 237,760	$ 479,135	$ 470,253
Expenses	176,498	173,616	355,540	341,136
Operating profit (loss)	64,739	64,144	123,595	129,117
Operating margin	27.00%	27.00%	26.00%	27.00%
Private Banks [Member]
Segment Reporting Information [Line Items]
Revenues	88,303	87,873	176,291	174,582
Expenses	84,886	86,274	172,403	168,677
Operating profit (loss)	3,417	1,599	3,888	5,905
Operating margin	4.00%	2.00%	2.00%	3.00%
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Revenues	49,375	49,768	98,843	97,876
Expenses	29,025	27,734	58,326	54,774
Operating profit (loss)	20,350	22,034	40,517	43,102
Operating margin	41.00%	44.00%	41.00%	44.00%
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Revenues	55,895	54,731	109,212	107,916
Expenses	28,740	27,406	56,840	54,359
Operating profit (loss)	27,155	27,325	52,372	53,557
Operating margin	49.00%	50.00%	48.00%	50.00%
Investment Managers [Member]
Segment Reporting Information [Line Items]
Revenues	46,713	44,452	92,924	87,893
Expenses	30,163	29,282	60,589	57,281
Operating profit (loss)	16,550	15,170	32,335	30,612
Operating margin	35.00%	34.00%	35.00%	35.00%
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Revenues	951	936	1,865	1,986
Expenses	3,684	2,920	7,382	6,045
Operating profit (loss)	$ (2,733)	$ (1,984)	$ (5,517)	$ (4,059)

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Shareholders' Equity (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 41,397		$ 41,397
Total intrinsic value of options exercised			4,327
Aggregate intrinsic value of options exercisable	26,977		26,977
Market value of common stock	$ 19.89		$ 19.89
Weighted average exercise price per share	$ 17.37		$ 17.37
Total options that were outstanding	25,564,000		25,564,000
Total options that were exercisable	10,712,000		10,712,000
Shares purchased and retired			4,098,000
Company purchased, cost			79,879
Remaining stock repurchase authorization amount	116,397		116,397
Common Stock, Dividends, Per Share, Declared	$ 0.15	$ 0.12	$ 0.15	$ 0.12
Dividends, Cash			$ 26,117	$ 22,041
2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of active equity compensation plans	1
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	20,000,000		20,000,000
Vesting Rate When Specified Diluted Earnings Per Share Targets are Achieved	50.00%
Vesting Rate Higher Specified Diluted Earnings Per Share Targets are Achieved	50.00%

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Investment In Unconsolidated Affiliate

6 Months Ended

Jun. 30, 2012

Investment In Unconsolidated Affiliate [Abstract]

Investment In Unconsolidated Affiliate

Investment in Unconsolidated Affiliate

The Company has an investment in the general partnership LSV Asset Management (LSV). LSV is a registered investment advisor that provides investment advisory services to institutions, including pension plans and investment companies. LSV is currently an investment sub-advisor for a small number of SEI-sponsored mutual funds. The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations.

As of December 31, 2011, the Company's total partnership interest in LSV was approximately 41.2 percent. In March 2009, certain partners (the Contributing partners) of LSV, including the Company, designated a portion of their partnership interest for the purpose of providing an interest in the partnership to a select group of key employees. Until such time an interest in the partnership is issued to a key employee, all profits, losses, distributions and other rights and obligations relating to such unissued interests remains with the Contributing partners. Each issuance must be authorized by unanimous vote of all Contributing partners. In April 2012, the Contributing partners agreed to provide certain key employees an interest in LSV, thereby reducing the Company’s interest in LSV to approximately 39.8 percent.

At June 30, 2012, the Company’s total investment in LSV was $63,553. The investment in LSV exceeded the underlying equity in the net assets of LSV by $3,499, of which $3,062 is considered goodwill embedded in the investment. The Company receives partnership distributions from LSV on a quarterly basis. The Company received partnership distribution payments from LSV for $47,443 and $50,760 in the six months ended June 30, 2012 and 2011, respectively.

The Company’s proportionate share in the earnings of LSV was $22,712 and $29,530 during the three months ended June 30, 2012 and 2011, respectively. During the six months ended June 30, 2012 and 2011, the Company's proportionate share in the earnings of LSV was $50,042 and $58,479, respectively.

The following table contains the condensed statements of operations of LSV for the three months ended June 30, 2012 and 2011:

	Three Months Ended
	June 30,
	2012		2011
Revenues	$	69,189	$	81,748
Net income	57,372		72,018

The following table contains the condensed statements of operations of LSV for the six months ended June 30, 2012 and 2011:

	Six Months Ended
	June 30,
	2012		2011
Revenues	$	146,654	$	161,150
Net income	124,045		141,964

Guaranty Agreement

In April 2011, LSV Employee Group II, LLC agreed to purchase a partnership interest of an existing LSV employee for $4,300, of which $3,655 was financed through a term loan with Bank of America, N.A. (Bank of America). The Company provided an unsecured guaranty to the lenders of all the obligations of LSV Employee Group II, LLC. The lenders have the right to seek payment from the Company in the event of a default by LSV Employee Group II, LLC. The term loan has a four year term and will be repaid from the quarterly distributions of LSV. LSV Employee Group II made principal payments of $468 during the six months ended June 30, 2012. As of June 30, 2012, the remaining unpaid principal balance of the term loan was $2,729. This amount is not reflected, nor is it required to be reflected, in the Company’s Consolidated Balance Sheet at June 30, 2012.

The Company’s direct interest in LSV is unchanged as a result of this transaction. The Company has determined that LSV Employee Group II is a variable interest entity (VIE); however, the Company is not considered the primary beneficiary because it does not have the power to direct the activities that most significantly impact the economic performance of LSV Employee Group II either directly or through any financial responsibility from the guaranty.

In July 2012, LSV Employee Group II made a principal payment of $272. As of July 31, 2012, the remaining unpaid principal balance of the term loan was $2,457. The Company, in its capacity as guarantor, currently has no obligation of payment relating to the term loan of LSV Employee Group II and, furthermore, fully expects that LSV Employee Group II will meet all of their future obligations regarding the term loan.

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Marketable Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Net unrealized holding gains	$ 2,593		$ 2,593		$ 2,574
Unrealized holding gains during the period, income tax expense			1,572		1,518
Available-for-sale Securities, Gross Realized Gain (Loss)			0	0
Net gain (loss) from investments	664	(1,948)	3,869	5,330
Securities owned	21,057		21,057		20,949
SEI Private Trust Company [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt maturity, minimum	2020
Debt maturity, maximum	2041
U.S. Government Agency And Commercial Paper Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt maturity, maximum	one
SIV Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Net gains from SIV securities			3,954	4,920
Gains from cash payments received from SIV securities			4,463	6,232
Gains or losses from increase/decrease in fair value of SIV securities			$ (509)	$ (1,312)

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Business Segment Information (Tables)

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

Schedule Of Financial Information About Business Segments

The following tables highlight certain unaudited financial information about each of the Company’s business segments for the six months ended June 30, 2012 and 2011.

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Six Months Ended June 30, 2012
Revenues	$	176,291		$	98,843		$	109,212		$	92,924		$	1,865		$	479,135
Expenses	172,403			58,326			56,840			60,589			7,382			355,540
Operating profit (loss)	$	3,888		$	40,517		$	52,372		$	32,335		$	(5,517	)	$	123,595
Operating margin	2		%	41		%	48		%	35		%	N/A			26		%

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Six Months Ended June 30, 2011
Revenues	$	174,582		$	97,876		$	107,916		$	87,893		$	1,986		$	470,253
Expenses	168,677			54,774			54,359			57,281			6,045			341,136
Operating profit (loss)	$	5,905		$	43,102		$	53,557		$	30,612		$	(4,059	)	$	129,117
Operating margin	3		%	44		%	50		%	35		%	N/A			27		%

The following tables highlight certain unaudited financial information about each of the Company’s business segments for the three months ended June 30, 2012 and 2011.

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Three Months Ended June 30, 2012
Revenues	$	88,303		$	49,375		$	55,895		$	46,713		$	951		$	241,237
Expenses	84,886			29,025			28,740			30,163			3,684			176,498
Operating profit (loss)	$	3,417		$	20,350		$	27,155		$	16,550		$	(2,733	)	$	64,739
Operating margin	4		%	41		%	49		%	35		%	N/A			27		%

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Three Months Ended June 30, 2011
Revenues	$	87,873		$	49,768		$	54,731		$	44,452		$	936		$	237,760
Expenses	86,274			27,734			27,406			29,282			2,920			173,616
Operating profit (loss)	$	1,599		$	22,034		$	27,325		$	15,170		$	(1,984	)	$	64,144
Operating margin	2		%	44		%	50		%	34		%	N/A			27		%

Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations

A reconciliation of the total reported for the business segments to income from operations in the Consolidated Statements of Operations for the six months ended June 30, 2012 and 2011 is as follows:

	2012			2011
Total operating profit from segments above	$	123,595		$	129,117
Corporate overhead expenses	(22,162		)	(21,368		)
Noncontrolling interest reflected in segments	454			805
Income from operations	$	101,887		$	108,554

A reconciliation of the total reported for the business segments to income from operations in the Consolidated Statements of Operations for the three months ended June 30, 2012 and 2011 is as follows:

	2012			2011
Total operating profit from segments above	$	64,739		$	64,144
Corporate overhead expenses	(11,080		)	(10,720		)
Noncontrolling interest reflected in segments	139			533
Income from operations	$	53,798		$	53,957

Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table Text Block]

The following tables provide additional information for the three months ended June 30, 2012 and 2011 pertaining to our business segments:

	Capital Expenditures					Depreciation
	2012		2011			2012		2011
Private Banks	$	8,180	$	6,783		$	3,704	$	3,962
Investment Advisors	2,805		2,296			492		556
Institutional Investors	636		251			251		268
Investment Managers	1,110		89			492		435
Investments in New Businesses	148		92			490		29
Total from business segments	$	12,879	$	9,511		$	5,429	$	5,250
Corporate Overhead	286		(24		)	201		141
	$	13,165	$	9,487		$	5,630	$	5,391

	Amortization
	2012		2011
Private Banks	$	4,794	$	4,608
Investment Advisors	1,757		1,551
Institutional Investors	302		196
Investment Managers	201		131
Investments in New Businesses	296		65
Total from business segments	$	7,350	$	6,551
Corporate Overhead	57		241
	$	7,407	$	6,792

The following tables provide additional information for the six months ended June 30, 2012 and 2011 pertaining to our business segments:

	Capital Expenditures				Depreciation
	2012		2011		2012		2011
Private Banks	$	20,022	$	17,813	$	7,432	$	8,000
Investment Advisors	6,946		6,038		986		1,147
Institutional Investors	1,867		1,132		513		560
Investment Managers	4,163		1,873		968		938
Investments in New Businesses	420		304		824		59
Total from business segments	$	33,418	$	27,160	$	10,723	$	10,704
Corporate Overhead	1,140		350		339		298
	$	34,558	$	27,510	$	11,062	$	11,002

	Amortization
	2012		2011
Private Banks	$	9,479	$	8,837
Investment Advisors	3,473		2,969
Institutional Investors	604		363
Investment Managers	402		246
Investments in New Businesses	573		124
Total from business segments	$	14,531	$	12,539
Corporate Overhead	498		484
	$	15,029	$	13,023

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Accumulated Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2012

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax

Accumulated other comprehensive income, net of tax, consists of:

	Foreign Currency Translation Adjustments			Unrealized Holding Gains (Losses) on Investments		Accumulated Other Comprehensive Income
Total accumulated comprehensive income at December 31, 2011	$	(2,043	)	$	2,574	$	531
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2011	1,369			—		1,369
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2011	$	(674	)	$	2,574	$	1,900
Total comprehensive income for the six months ended June 30, 2012	$	547		$	19	$	566
Less: Total comprehensive income attributable to noncontrolling interest for the six months ended June 30, 2012	(329		)	—		(329		)
Total comprehensive income attributable to SEI Investments Company for the six months ended June 30, 2012	$	218		$	19	$	237
Total accumulated comprehensive income at June 30, 2012	$	(1,496	)	$	2,593	$	1,097
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at June 30, 2012	1,040			—		1,040
Total accumulated comprehensive income attributable to SEI Investments Company at June 30, 2012	$	(456	)	$	2,593	$	2,137

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Income Taxes (Interest And Penalties) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Income Tax Uncertainties [Abstract]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 11,547	$ 9,410
Interest and penalties on unrecognized benefits	853	634
Gross uncertain tax positions	12,400	10,044
Amount included in Current liabilities	1,768	1,768
Amount included in Other long-term liabilities	$ 10,632	$ 8,276

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Marketable Securities (Investments Available For Sale) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Investment Available for Sale, Cost Amount	$ 77,073	$ 78,916
Investment Available for Sale, Gross Unrealized Gains	4,491	4,452
Investment Available for Sale, Gross Unrealized Losses	(326)	(360)
Investment Available for Sale, Fair Value	81,238	83,008
SEI-Sponsored Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Available for Sale, Cost Amount	12,736	8,243
Investment Available for Sale, Gross Unrealized Gains	11	48
Investment Available for Sale, Gross Unrealized Losses	(326)	(360)
Investment Available for Sale, Fair Value	12,421	7,931
Other Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Available for Sale, Cost Amount	28	69
Investment Available for Sale, Gross Unrealized Gains	4	10
Investment Available for Sale, Gross Unrealized Losses	0	0
Investment Available for Sale, Fair Value	32	79
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Available for Sale, Cost Amount	64,309	70,604
Investment Available for Sale, Gross Unrealized Gains	4,476	4,394
Investment Available for Sale, Gross Unrealized Losses	0	0
Investment Available for Sale, Fair Value	$ 68,785	$ 74,998

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2012

Income Tax Uncertainties [Abstract]

Schedule Of Interest And Penalties

	June 30, 2012		December 31, 2011
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$	11,547	$	9,410
Interest and penalties on unrecognized benefits	853		634
Total gross uncertain tax positions	$	12,400	$	10,044
Amount included in Current liabilities	$	1,768	$	1,768
Amount included in Other long-term liabilities	10,632		8,276
	$	12,400	$	10,044

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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 years	Jun. 30, 2011	Jun. 30, 2012 years	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Payments to Acquire Software			$ 18,214	$ 20,537
Cash and cash equivalents	347,494	442,311	347,494	442,311	420,986	496,292
Capitalized software, weighted average remaining life, years	10.0		10.0
Amortization expense related to capitalized software			14,531	12,532
Capitalized software, accumulated amortization	131,631		131,631		117,100
Anti-dilutive employee stock options	16,637,000	7,675,000	14,017,000	7,606,000
Average exercise price of anti-dilutive employee stock options	$ 22.75	$ 28.25	$ 23.40	$ 28.26
SEI Investments (Europe) Limited [Member]
Restricted cash	5,000		5,000		5,000
SEI Investments Distribution Co. (SIDCO) [Member]
Restricted cash	1,000		1,000		1,000
Global Wealth Platform [Member]
Capitalized software, weighted average remaining life, years	10.0		10.0
Amortization expense related to capitalized software			14,297	12,249
Net book value of GWP	302,829		302,829
Capitalized software, accumulated amortization	102,059		102,059
Capitalized software development costs in-progress associated with future releases	9,328		9,328
Software useful life, years			15
SEI-Sponsored Open-Ended Money Market Mutual Funds [Member]
Cash and cash equivalents	$ 185,240		$ 185,240		$ 281,760

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Summary Of Significant Accounting Policies

6 Months Ended

Jun. 30, 2012

Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

Summary of Significant Accounting Policies

Nature of Operations

SEI Investments Company (the Company), a Pennsylvania corporation, provides investment processing, investment management, and investment operations solutions to corporations, financial institutions, financial advisors, and ultra-high-net-worth families in the United States, Canada, the United Kingdom, continental Europe, and other various locations throughout the world. Investment processing solutions consist of application and business process outsourcing services, professional services and transaction-based services. Revenues from investment processing solutions are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations, except for fees earned associated with trade execution services.

Investment management programs consist of mutual funds, alternative investments and separate accounts. These include a series of money market, equity, fixed-income and alternative investment portfolios, primarily in the form of registered investment companies. The Company serves as the administrator and investment advisor for many of these products. Revenues from investment management programs are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Investment operations solutions offer investment managers support for traditional investment products such as mutual funds, collective investment trusts, exchange-traded funds, and institutional and separate accounts, by providing outsourcing services including fund and investment accounting, administration, reconciliation, investor servicing and client reporting. These solutions also provide support to managers focused on alternative investments who manage hedge funds, funds of hedge funds, private equity funds and real estate funds, across registered, partnership and separate account structures domiciled in the United States and overseas. Revenues from investment operations solutions are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Basis of Presentation

The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America. Certain financial information and accompanying note disclosure normally included in the Company’s Annual Report on Form 10-K has been condensed or omitted. The interim financial information is unaudited but reflects all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of financial position of the Company as of June 30, 2012, the results of operations for the three and six months ended June 30, 2012 and 2011, and cash flows for the six month periods ended June 30, 2012 and 2011. 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, 2011.

There have been no significant changes in significant accounting policies during the six months ended June 30, 2012 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2011.

Cash and Cash Equivalents

Cash and cash equivalents includes $185,240 and $281,760 at June 30, 2012 and December 31, 2011, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds.

Restricted Cash

Restricted cash includes $5,000 at June 30, 2012 and December 31, 2011 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $1,000 at June 30, 2012 and December 31, 2011 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 for broker-dealers.

Capitalized Software

The Company capitalized $18,214 and $20,537 of software development costs during the six months ended June 30, 2012 and 2011, respectively. As of June 30, 2012, capitalized software placed into service included on the accompanying Consolidated Balance Sheet had a weighted average remaining life of approximately 10.0 years. Amortization expense related to capitalized software was $14,531 and $12,532 during the six months ended June 30, 2012 and 2011, respectively.

Software development costs capitalized during the six months ended June 30, 2012 and 2011 relates to the continued development of the Global Wealth Platform (GWP). As of June 30, 2012, the net book value of GWP was $302,829, net of accumulated amortization of $102,059. Capitalized software development costs in-progress at June 30, 2012 associated with future releases to GWP were $9,328. GWP has an estimated useful life of 15 years and a weighted average remaining life of 10.0 years. Amortization expense for GWP was $14,297 and $12,249 during the six months ended June 30, 2012 and 2011, respectively.

Earnings per Share

The calculations of basic and diluted earnings per share for the three months ended June 30, 2012 and 2011 are:

	For the Three Months Ended June 30, 2012
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	49,555	174,830	$	0.28
Dilutive effect of stock options	—		1,083
Diluted earnings per common share	$	49,555	175,913	$	0.28

	For the Three Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	53,603	184,585	$	0.29
Dilutive effect of stock options	—		2,435
Diluted earnings per common share	$	53,603	187,020	$	0.29

Employee stock options to purchase 16,637,000 and 7,675,000 shares of common stock, with an average exercise price of $22.75 and $28.25, were outstanding during the three months ended June 30, 2012 and 2011, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

The calculations of basic and diluted earnings per share for the six months ended June 30, 2012 and 2011 are:

	For the Six Months Ended June 30, 2012
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	99,520	175,589	$	0.57
Dilutive effect of stock options	—		1,202
Diluted earnings per common share	$	99,520	176,791	$	0.56

	For the Six Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	111,331	185,186	$	0.60
Dilutive effect of stock options	—		2,571
Diluted earnings per common share	$	111,331	187,757	$	0.59

Employee stock options to purchase 14,017,000 and 7,606,000 shares of common stock, with an average exercise price of $23.40 and $28.26, were outstanding during the six months ended June 30, 2012 and 2011, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

Statements of Cash Flows

For purposes of the Consolidated Statements of Cash Flows, the Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents.

The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the six months ended June 30:

	2012			2011
Net income	$	99,974		$	112,153
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	11,062			11,002
Amortization	15,029			13,023
Equity in earnings of unconsolidated affiliate	(50,042		)	(58,479		)
Distributions received from unconsolidated affiliate	47,443			50,760
Stock-based compensation	7,898			7,542
Provision for losses on receivables	(104		)	(327		)
Deferred income tax expense	(1,291		)	(36		)
Net realized gains from investments	(3,869		)	(5,330		)
Change in other long-term liabilities	2,356			1,904
Change in other assets	(916		)	(1,658		)
Other	657			3,858
Change in current asset and liabilities
Decrease (increase) in
Receivables from regulated investment companies	(7,881		)	(1,953		)
Receivables	(26,992		)	(15,353		)
Other current assets	147			(211		)
Increase (decrease) in
Accounts payable	1,851			(1,727		)
Accrued liabilities	(18,810		)	(21,081		)
Deferred revenue	(1,399		)	(1,247		)
Total adjustments	(24,861		)	(19,313		)
Net cash provided by operating activities	$	75,113		$	92,840

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Summary Of Significant Accounting Policies (Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Accounting Policies [Abstract]
Basic earnings per common share, Income (Numerator)	$ 49,555	$ 53,603	$ 99,520	$ 111,331
Basic earnings per common share, Shares (Denominator)	174,830	184,585	175,589	185,186
Basic earnings per common share, Per Share Amount	$ 0.28	$ 0.29	$ 0.57	$ 0.60
Dilutive effect of stock options, Income (Numerator)	0	0	0	0
Dilutive effect of stock options, Shares (Denominator)	1,083	2,435	1,202	2,571
Diluted earnings per common share, Income (Numerator)	$ 49,555	$ 53,603	$ 99,520	$ 111,331
Diluted earnings per common share, Shares (Denominator)	175,913	187,020	176,791	187,757
Diluted earnings per common share, Per Share Amount	$ 0.28	$ 0.29	$ 0.56	$ 0.59

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Fair Value Measurements (Narrative) (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial liabilities	$ 0	$ 0

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Business Segment Information (Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting [Abstract]
Total operating profit from segments above	$ 64,739	$ 64,144	$ 123,595	$ 129,117
Corporate overhead expenses	(11,080)	(10,720)	(22,162)	(21,368)
Noncontrolling interest reflected in segments	139	533	454	805
Income from operations	$ 53,798	$ 53,957	$ 101,887	$ 108,554

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 347,494	$ 420,986
Restricted cash	6,000	6,000
Receivables from regulated investment companies	33,681	25,800
Receivables, net of allowance for doubtful accounts of $820 and $924 (Note 4)	168,913	142,109
Deferred income taxes	455	1,150
Securities owned (Note 6)	21,057	20,949
Other current assets	17,810	17,957
Total Current Assets	595,410	634,951
Property and Equipment, net of accumulated depreciation of $191,976 and $182,453 (Note 4)	135,011	129,548
Capitalized Software, net of accumulated amortization of $131,631 and $117,100	312,815	309,133
Investments Available for Sale (Note 6)	81,238	83,008
Trading Securities (Note 6)	53,253	56,325
Investment in Unconsolidated Affiliate (Note 2)	63,553	60,954
Other Assets, net	23,582	20,640
Total Assets	1,264,862	1,294,559
Current Liabilities:
Accounts payable	3,850	1,999
Accrued liabilities (Note 4)	100,902	147,044
Deferred revenue	631	2,030
Total Current Liabilities	105,383	151,073
Deferred Income Taxes	91,819	93,751
Other Long-term Liabilities (Note 11)	10,632	8,276
Total Liabilities	207,834	253,100
Commitments and Contingencies (Note 12)
SEI Investments shareholders' equity:
Common stock, $.01 par value, 750,000 shares authorized; 173,374 and 176,506 shares issued and outstanding	1,734	1,765
Capital in excess of par value	588,419	577,949
Retained Earnings	447,812	443,702
Accumulated other comprehensive income, net	2,137	1,900
Total SEI Investments shareholders' equity	1,040,102	1,025,316
Noncontrolling interest	16,926	16,143
Total Equity	1,057,028	1,041,459
Total Liabilities and Equity	$ 1,264,862	$ 1,294,559

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Marketable Securities (Trading Securities) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Gain (Loss) on Investments [Line Items]
Trading Securities, Cost	$ 142,452	$ 149,627
Trading Securities, Gross Unrealized Gains	1,816	1,653
Trading Securities, Gross Unrealized Losses	(91,015)	(94,955)
Trading Securities, Fair Value	53,253	56,325
SIV Securities [Member]
Gain (Loss) on Investments [Line Items]
Trading Securities, Cost	139,188	146,363
Trading Securities, Gross Unrealized Gains	0	0
Trading Securities, Gross Unrealized Losses	(91,001)	(94,955)
Trading Securities, Fair Value	48,187	51,408
LSV-Sponsored Mutual Funds [Member]
Gain (Loss) on Investments [Line Items]
Trading Securities, Cost	2,049	2,049
Trading Securities, Gross Unrealized Gains	1,816	1,653
Trading Securities, Gross Unrealized Losses	0	0
Trading Securities, Fair Value	3,865	3,702
Other Investments [Member]
Gain (Loss) on Investments [Line Items]
Trading Securities, Cost	1,215	1,215
Trading Securities, Gross Unrealized Gains	0	0
Trading Securities, Gross Unrealized Losses	(14)	0
Trading Securities, Fair Value	$ 1,201	$ 1,215

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Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Statement of Income and Comprehensive Income [Abstract]
Unrealized holding gains (losses) during the period, income tax expense	$ 70	$ 348	$ 77	$ 236
Reclassification adjustment for gains realized in net income, income tax expense	$ 12	$ (15)	$ (23)	$ (75)

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Investment In Unconsolidated Affiliate (Condensed Statement Of Operations Of LSV) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Investments in and Advances to Affiliates [Line Items]
Revenues	$ 241,237	$ 237,760	$ 479,135	$ 470,253
Net income	49,555	53,603	99,520	111,331
LSV [Member]
Investments in and Advances to Affiliates [Line Items]
Revenues	69,189	81,748	146,654	161,150
Net income	$ 57,372	$ 72,018	$ 124,045	$ 141,964

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Summary Of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2012

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 June 30, 2012 and 2011 are:

	For the Three Months Ended June 30, 2012
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	49,555	174,830	$	0.28
Dilutive effect of stock options	—		1,083
Diluted earnings per common share	$	49,555	175,913	$	0.28

	For the Three Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	53,603	184,585	$	0.29
Dilutive effect of stock options	—		2,435
Diluted earnings per common share	$	53,603	187,020	$	0.29

Employee stock options to purchase 16,637,000 and 7,675,000 shares of common stock, with an average exercise price of $22.75 and $28.25, were outstanding during the three months ended June 30, 2012 and 2011, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

The calculations of basic and diluted earnings per share for the six months ended June 30, 2012 and 2011 are:

	For the Six Months Ended June 30, 2012
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	99,520	175,589	$	0.57
Dilutive effect of stock options	—		1,202
Diluted earnings per common share	$	99,520	176,791	$	0.56

	For the Six Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	111,331	185,186	$	0.60
Dilutive effect of stock options	—		2,571
Diluted earnings per common share	$	111,331	187,757	$	0.59

Employee stock options to purchase 14,017,000 and 7,606,000 shares of common stock, with an average exercise price of $23.40 and $28.26, were outstanding during the six months ended June 30, 2012 and 2011, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities

The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the six months ended June 30:

	2012			2011
Net income	$	99,974		$	112,153
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	11,062			11,002
Amortization	15,029			13,023
Equity in earnings of unconsolidated affiliate	(50,042		)	(58,479		)
Distributions received from unconsolidated affiliate	47,443			50,760
Stock-based compensation	7,898			7,542
Provision for losses on receivables	(104		)	(327		)
Deferred income tax expense	(1,291		)	(36		)
Net realized gains from investments	(3,869		)	(5,330		)
Change in other long-term liabilities	2,356			1,904
Change in other assets	(916		)	(1,658		)
Other	657			3,858
Change in current asset and liabilities
Decrease (increase) in
Receivables from regulated investment companies	(7,881		)	(1,953		)
Receivables	(26,992		)	(15,353		)
Other current assets	147			(211		)
Increase (decrease) in
Accounts payable	1,851			(1,727		)
Accrued liabilities	(18,810		)	(21,081		)
Deferred revenue	(1,399		)	(1,247		)
Total adjustments	(24,861		)	(19,313		)
Net cash provided by operating activities	$	75,113		$	92,840

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Variable Interest Entities - Investment Products (Details)	6 Months Ended
	Jun. 30, 2012
Variable Interest Entities - Investment Products [Abstract]
Percentage not approached by expected return on any VIE investment	50.00%

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Composition Of Certain Financial Statement Captions (Tables)

6 Months Ended

Jun. 30, 2012

Composition Of Certain Financial Statement Captions [Abstract]

Receivables

Receivables on the accompanying Consolidated Balance Sheets consist of:

	June 30, 2012			December 31, 2011
Trade receivables	$	43,162		$	37,822
Fees earned, not billed	110,853			92,916
Other receivables	15,718			12,295
	169,733			143,033
Less: Allowance for doubtful accounts	(820		)	(924		)
	$	168,913		$	142,109

Property And Equipment

Property and Equipment on the accompanying Consolidated Balance Sheets consists of:

	June 30, 2012			December 31, 2011
Buildings	$	137,421		$	136,949
Equipment	65,884			64,256
Land	9,929			9,929
Purchased software	90,580			77,971
Furniture and fixtures	18,245			17,999
Leasehold improvements	4,820			4,558
Construction in progress	108			339
	326,987			312,001
Less: Accumulated depreciation	(191,976		)	(182,453		)
Property and Equipment, net	$	135,011		$	129,548

Accrued Liabilities

Accrued liabilities on the accompanying Consolidated Balance Sheets consist of:

	June 30, 2012		December 31, 2011
Accrued employee compensation	$	31,728	$	48,112
Accrued employee benefits and other personnel	5,359		5,408
Accrued consulting, outsourcing and professional fees	16,850		17,477
Accrued brokerage fees	7,586		8,665
Accrued sub-advisory, distribution and other asset management fees	16,657		17,091
Accrued dividend payable	—		26,518
Other accrued liabilities	22,722		23,773
Total accrued liabilities	$	100,902	$	147,044

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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 99,974	$ 112,153
Adjustments to reconcile net income to net cash provided by operating activities	(24,861)	(19,313)
Net cash provided by operating activities	75,113	92,840
Cash flows from investing activities:
Additions to property and equipment	(16,344)	(6,973)
Additions to capitalized software	(18,214)	(20,537)
Purchases of marketable securities	(13,827)	(36,596)
Prepayments and maturities of marketable securities	22,170	23,134
Sales of marketable securities	737	37,408
Purchases of other investments	(2,720)	0
Sales of other investments	0	4,905
Net cash (used in) provided by investing activities	(28,198)	1,341
Cash flows from financing activities:
Payments on long-term debt	0	(55,000)
Purchase and retirement of common stock	(80,899)	(94,137)
Proceeds from issuance of common stock	14,765	20,845
Tax benefit on stock options exercised	(1,638)	2,171
Payment of dividends	(52,635)	(22,041)
Net cash used in financing activities	(120,407)	(148,162)
Net decrease in cash and cash equivalents	(73,492)	(53,981)
Cash and cash equivalents, beginning of period	420,986	496,292
Cash and cash equivalents, end of period	$ 347,494	$ 442,311

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 820	$ 924
Property and Equipment, accumulated depreciation	191,976	182,453
Capitalized Software, accumulated amortization	$ 131,631	$ 117,100
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750,000	750,000
Common stock, shares issued	173,374	176,506
Common stock, shares outstanding	173,374	176,506

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Business Segment Information

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

Business Segment Information

Business Segment Information

The Company’s reportable business segments are:

Private Banks – provides investment processing and investment management programs to banks and trust institutions worldwide, independent wealth advisers located in the United Kingdom, and financial advisors in Canada;

Investment Advisors – provides investment management programs to affluent investors through a network of independent registered investment advisors, financial planners, and other investment professionals in the United States;

Institutional Investors – provides investment management programs and administrative outsourcing solutions to retirement plan sponsors, hospitals, and not-for-profit organizations worldwide;

Investment Managers – provides investment operations outsourcing solutions to investment managers, fund companies and banking institutions located in the United States, and to investment managers worldwide of alternative asset classes such as hedge funds, funds of hedge funds, and private equity funds across both registered and partnership structures; and

Investments in New Businesses – provides investment management programs to ultra-high-net-worth families residing in the United States through the SEI Wealth Network^® and conducts other research and development activities.

The information in the following tables is derived from the Company’s internal financial reporting used for corporate management purposes. There are no inter-segment revenues for the three and six months ended June 30, 2012 and 2011. 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, 2011.

The following tables highlight certain unaudited financial information about each of the Company’s business segments for the three months ended June 30, 2012 and 2011.

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Three Months Ended June 30, 2012
Revenues	$	88,303		$	49,375		$	55,895		$	46,713		$	951		$	241,237
Expenses	84,886			29,025			28,740			30,163			3,684			176,498
Operating profit (loss)	$	3,417		$	20,350		$	27,155		$	16,550		$	(2,733	)	$	64,739
Operating margin	4		%	41		%	49		%	35		%	N/A			27		%

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Three Months Ended June 30, 2011
Revenues	$	87,873		$	49,768		$	54,731		$	44,452		$	936		$	237,760
Expenses	86,274			27,734			27,406			29,282			2,920			173,616
Operating profit (loss)	$	1,599		$	22,034		$	27,325		$	15,170		$	(1,984	)	$	64,144
Operating margin	2		%	44		%	50		%	34		%	N/A			27		%

A reconciliation of the total reported for the business segments to income from operations in the Consolidated Statements of Operations for the three months ended June 30, 2012 and 2011 is as follows:

	2012			2011
Total operating profit from segments above	$	64,739		$	64,144
Corporate overhead expenses	(11,080		)	(10,720		)
Noncontrolling interest reflected in segments	139			533
Income from operations	$	53,798		$	53,957

The following tables provide additional information for the three months ended June 30, 2012 and 2011 pertaining to our business segments:

	Capital Expenditures					Depreciation
	2012		2011			2012		2011
Private Banks	$	8,180	$	6,783		$	3,704	$	3,962
Investment Advisors	2,805		2,296			492		556
Institutional Investors	636		251			251		268
Investment Managers	1,110		89			492		435
Investments in New Businesses	148		92			490		29
Total from business segments	$	12,879	$	9,511		$	5,429	$	5,250
Corporate Overhead	286		(24		)	201		141
	$	13,165	$	9,487		$	5,630	$	5,391

	Amortization
	2012		2011
Private Banks	$	4,794	$	4,608
Investment Advisors	1,757		1,551
Institutional Investors	302		196
Investment Managers	201		131
Investments in New Businesses	296		65
Total from business segments	$	7,350	$	6,551
Corporate Overhead	57		241
	$	7,407	$	6,792

The following tables highlight certain unaudited financial information about each of the Company’s business segments for the six months ended June 30, 2012 and 2011.

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Six Months Ended June 30, 2012
Revenues	$	176,291		$	98,843		$	109,212		$	92,924		$	1,865		$	479,135
Expenses	172,403			58,326			56,840			60,589			7,382			355,540
Operating profit (loss)	$	3,888		$	40,517		$	52,372		$	32,335		$	(5,517	)	$	123,595
Operating margin	2		%	41		%	48		%	35		%	N/A			26		%

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Six Months Ended June 30, 2011
Revenues	$	174,582		$	97,876		$	107,916		$	87,893		$	1,986		$	470,253
Expenses	168,677			54,774			54,359			57,281			6,045			341,136
Operating profit (loss)	$	5,905		$	43,102		$	53,557		$	30,612		$	(4,059	)	$	129,117
Operating margin	3		%	44		%	50		%	35		%	N/A			27		%

A reconciliation of the total reported for the business segments to income from operations in the Consolidated Statements of Operations for the six months ended June 30, 2012 and 2011 is as follows:

	2012			2011
Total operating profit from segments above	$	123,595		$	129,117
Corporate overhead expenses	(22,162		)	(21,368		)
Noncontrolling interest reflected in segments	454			805
Income from operations	$	101,887		$	108,554

The following tables provide additional information for the six months ended June 30, 2012 and 2011 pertaining to our business segments:

	Capital Expenditures				Depreciation
	2012		2011		2012		2011
Private Banks	$	20,022	$	17,813	$	7,432	$	8,000
Investment Advisors	6,946		6,038		986		1,147
Institutional Investors	1,867		1,132		513		560
Investment Managers	4,163		1,873		968		938
Investments in New Businesses	420		304		824		59
Total from business segments	$	33,418	$	27,160	$	10,723	$	10,704
Corporate Overhead	1,140		350		339		298
	$	34,558	$	27,510	$	11,062	$	11,002

	Amortization
	2012		2011
Private Banks	$	9,479	$	8,837
Investment Advisors	3,473		2,969
Institutional Investors	604		363
Investment Managers	402		246
Investments in New Businesses	573		124
Total from business segments	$	14,531	$	12,539
Corporate Overhead	498		484
	$	15,029	$	13,023

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Document And Entity Information	6 Months Ended
	Jun. 30, 2012	Jul. 31, 2012
Document Information [Line Items]
Entity Registrant Name	SEI INVESTMENTS CO
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	Jun. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Trading Symbol	SEIC
Amendment Flag	false
Entity Common Stock, Shares Outstanding		173,556,605

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Income Taxes

6 Months Ended

Jun. 30, 2012

Income Tax Uncertainties [Abstract]

Income Taxes

Income Taxes

The gross liability for unrecognized tax benefits at June 30, 2012 and December 31, 2011 was $11,547 and $9,410, respectively, exclusive of interest and penalties, of which $9,974 and $8,320 would affect the effective tax rate if the Company were to recognize the tax benefit.

The Company classifies interest and penalties on unrecognized tax benefits as income tax expense. As of June 30, 2012 and December 31, 2011, the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $853 and $634, respectively.

	June 30, 2012		December 31, 2011
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$	11,547	$	9,410
Interest and penalties on unrecognized benefits	853		634
Total gross uncertain tax positions	$	12,400	$	10,044
Amount included in Current liabilities	$	1,768	$	1,768
Amount included in Other long-term liabilities	10,632		8,276
	$	12,400	$	10,044

The Company’s effective tax rates were 36.6 percent and 34.7 percent for the three months ended June 30, 2012 and 2011, respectively. For the six months ended June 30, 2012 and 2011, the Company's tax rates were 36.9 percent and 36.0 percent, respectively. The 2011 tax rate reflects a benefit for research and development tax credit whereas the 2012 tax rate did not reflect any benefit. Additionally, during the three months ended June 30, 2011, management determined the Company was eligible for the Domestic Production Activities Deduction. The effective rate in the three months ended June 30, 2011 reflects the benefit of this deduction for both 2011 and 2010, whereas the 2012 tax rate only reflects the 2012 benefit.

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 2007 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2006.

The Company estimates it will recognize $1,768 of unrecognized tax benefits within the next twelve months due to the expiration of the statute of limitations and resolution of income tax audits. These unrecognized tax benefits are related to tax positions taken on certain federal, state, and foreign tax returns. However, the timing of the resolution of income tax examinations is highly uncertain, and the amounts ultimately paid, if any, upon resolution of the issues raised by the taxing authorities may differ materially from the amounts accrued for each year. While it is reasonably possible that some issues under examination could be resolved in the next twelve months, based upon the current facts and circumstances, the Company cannot reasonably estimate the timing of such resolution or total range of potential changes as it relates to the current unrecognized tax benefits that are recorded as part of the Company’s financial statements.

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Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues:
Asset management, administration and distribution fees	$ 176,613	$ 172,331	$ 349,567	$ 339,835
Information processing and software servicing fees	57,254	56,035	113,454	111,859
Transaction-based and trade execution fees	7,370	9,394	16,114	18,559
Total revenues	241,237	237,760	479,135	470,253
Expenses:
Subadvisory, distribution and other asset management costs	25,884	26,304	54,351	52,600
Software royalties and other information processing costs	5,228	7,188	11,705	14,205
Brokerage commissions	5,634	6,599	11,941	13,180
Compensation, benefits and other personnel	80,531	72,613	159,074	143,638
Stock-based compensation	3,865	3,810	7,898	7,542
Consulting, outsourcing and professional fees	26,329	29,398	53,284	55,396
Data processing and computer related	11,659	11,610	23,124	22,913
Facilities, supplies and other costs	15,272	14,098	29,780	28,200
Amortization	7,407	6,792	15,029	13,023
Depreciation	5,630	5,391	11,062	11,002
Total expenses	187,439	183,803	377,248	361,699
Income from operations	53,798	53,957	101,887	108,554
Net gain (loss) from investments	664	(1,948)	3,869	5,330
Interest and dividend income	1,440	1,436	2,927	2,980
Interest expense	(113)	(155)	(274)	(359)
Equity in earnings of unconsolidated affiliate	22,712	29,530	50,042	58,479
Net income before income taxes	78,501	82,820	158,451	174,984
Income taxes	28,762	28,707	58,477	62,831
Net income	49,739	54,113	99,974	112,153
Less: Net income attributable to the noncontrolling interest	(184)	(510)	(454)	(822)
Net income attributable to SEI Investments Company	$ 49,555	$ 53,603	$ 99,520	$ 111,331
Basic earnings per common share, Per Share Amount	$ 0.28	$ 0.29	$ 0.57	$ 0.60
Basic earnings per common share, Shares (Denominator)	174,830	184,585	175,589	185,186
Diluted earnings per common share, Per Share Amount	$ 0.28	$ 0.29	$ 0.56	$ 0.59
Diluted earnings per common share, Shares (Denominator)	175,913	187,020	176,791	187,757
Dividends declared per common share	$ 0.15	$ 0.12	$ 0.15	$ 0.12

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Fair Value Measurements

6 Months Ended

Jun. 30, 2012

Fair Value, by Balance Sheet Grouping, Methodology and Assumptions [Abstract]

Fair Value Measurements

Fair Value Measurements

The fair value of the Company’s financial assets and liabilities 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 equity and fixed-income mutual funds that are quoted daily. Level 2 financial assets consist of Government National Mortgage Association (GNMA) and other U.S. government agency securities that are single issuer pools that are valued based on current market data for the specific issue owned or pools of similar securities. Level 3 financial assets primarily consist of senior note obligations issued by SIVs. The Company had no Level 3 financial liabilities at June 30, 2012 or December 31, 2011. There were no transfers of financial assets between levels within the fair value hierarchy during the six months ended June 30, 2012.

Valuation of GNMA and Other U.S. Government Agency Securities

All of the Company's GNMA and other U.S. government agency securities are held in accounts at well-established financial institutions that utilize the services of independent pricing vendors. These vendors utilize evaluated and industry accepted pricing models that vary by asset class and incorporate available trade, bid and other market information to determine the fair value of the securities. The market inputs normally used for evaluations of securities, listed in approximate order of priority, include: benchmark yields, reported trade, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data. The Company records the securities at the prices provided by the independent pricing vendor without adjustment.

Valuation of SIV Securities

The underlying collateral of the SIV securities is mainly comprised of asset-backed securities and collateralized debt obligations. The Company utilizes the services of an independent firm that specializes in securities valuations to assist in determining the fair value of the SIV security owned. Given the lack of any reliable market data on the SIV security, the firm utilized a valuation model that employs a net asset approach which considers the value of the underlying collateral of the SIV security to determine its fair value. Management evaluated the value received from the firm and considered other information, such as the existence of any current market activity, to determine the fair value of the SIV securities. As a result of this evaluation, the Company utilized the fair value of the SIV security without adjustment as provided by the independent valuation firm.

The model used by the independent valuation firm to determine the fair value of the SIV security attempts to value the underlying collateral of the SIV security through the use of industry accepted and proprietary valuation techniques and models. This approach combines advanced analytics with real-time market information that incorporate structural and fundamental analysis, collateral characteristics and recent market developments. Each security that makes up the underlying collateral is specifically identified by its CUSIP or ISIN number and is analyzed by using observable collateral characteristics and credit statistics in order to project future performance and expected cash flows for each individual security. The projected cash flows incorporate assumptions and expectations based upon the foregoing analysis of the collateral characteristics such as, but not limited to, default probabilities, recovery rates, prepayment speeds and loss severities. Expected future cash flows are discounted at an appropriate yield derived from the individual security, structural and collateral characteristics, trading levels and other available market data. Different modeling techniques and associated inputs and assumptions may be used to project future cash flows for each security depending upon the asset classification of that individual security (i.e. residential mortgage-backed security, commercial mortgage-backed security, collateralized debt obligations, etc.). The aggregate value of the discounted cash flows of the underlying collateral is compared to the total remaining par value of the collateral to determine the expected recovery price, or fair value, of the remaining note obligations. Other factors may be considered that are specific to the SIV security that may affect the fair value of the SIV security.

Management may also consider, when available, price quotes from brokers and dealers. If a price quote is available, management will compare this number to the fair value derived from the valuation model of the independent firm giving consideration to other market factors and risk premiums. Given the lack of any significant trading activity for the SIV security owned by the Company, management believes that market prices may not represent the implied fair value of the SIV security owned by the Company.

In the event a market transaction does exist for a SIV security, management evaluates the publicly available information surrounding the transaction in order to assess if the price used represents the fair value for the SIV security. In management’s opinion, the current market for the SIV security does not represent any orderly and efficient market.

The fair value of certain financial assets and liabilities of the Company was determined using the following inputs:

	At June 30, 2012
	Fair Value Measurements at Reporting Date Using
Assets	Total		Quoted Prices in Active  Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Equity available-for-sale securities	$	12,453	$	12,453	$	—	$	—
Fixed income available-for-sale securities	68,785		—		68,785		—
Fixed income securities owned	21,057		—		21,057		—
Trading securities	53,253		3,865		—		49,388
	$	155,548	$	16,318	$	89,842	$	49,388

	At December 31, 2011
	Fair Value Measurements at Reporting Date Using
Assets	Total		Quoted Prices in Active  Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Equity available-for-sale securities	$	8,010	$	8,010	$	—	$	—
Fixed income available-for-sale securities	74,998		—		74,998		—
Fixed income securities owned	20,949		—		20,949		—
Trading securities	56,325		3,702		—		52,623
	$	160,282	$	11,712	$	95,947	$	52,623

The table below presents a reconciliation for all assets and liabilities of the Company measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the period from January 1, 2012 to June 30, 2012:

	Trading Securities
Balance, January 1, 2012	$	52,623
Purchases	—
Issuances	—
Principal prepayments and settlements	(7,176		)
Sales	—
Total gains or (losses) (realized/unrealized):
Included in earnings	3,941
Included in other comprehensive income	—
Transfers in and out of Level 3	—
Balance, June 30, 2012	$	49,388

The table below presents a reconciliation for all assets and liabilities of the Company measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the period from January 1, 2011 to June 30, 2011:

	Trading Securities
Balance, January 1, 2011	$	100,645
Purchases	—
Issuances	—
Principal prepayments and settlements	(10,806		)
Sales	(34,706		)
Total gains or (losses) (realized/unrealized):
Included in earnings	4,920
Included in other comprehensive income	—
Transfers in and out of Level 3	—
Balance, June 30, 2011	$	60,053

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Composition Of Certain Financial Statement Captions

6 Months Ended

Jun. 30, 2012

Composition Of Certain Financial Statement Captions [Abstract]

Composition Of Certain Financial Statement Captions

Composition of Certain Financial Statement Captions

Receivables

Receivables on the accompanying Consolidated Balance Sheets consist of:

	June 30, 2012			December 31, 2011
Trade receivables	$	43,162		$	37,822
Fees earned, not billed	110,853			92,916
Other receivables	15,718			12,295
	169,733			143,033
Less: Allowance for doubtful accounts	(820		)	(924		)
	$	168,913		$	142,109

Fees earned, not billed represents receivables earned but unbilled and results from timing differences between services provided and contractual billing schedules. These billing schedules generally provide for fees to be billed on a quarterly basis. In addition, certain fees earned from investment operations services are determined from security valuations which delay billings to clients.

Receivables from regulated investment companies on the accompanying Consolidated Balance Sheets primarily represent fees receivable for distribution, investment advisory, and administration services to various regulated investment companies sponsored by SEI.

Property and Equipment

Property and Equipment on the accompanying Consolidated Balance Sheets consists of:

	June 30, 2012			December 31, 2011
Buildings	$	137,421		$	136,949
Equipment	65,884			64,256
Land	9,929			9,929
Purchased software	90,580			77,971
Furniture and fixtures	18,245			17,999
Leasehold improvements	4,820			4,558
Construction in progress	108			339
	326,987			312,001
Less: Accumulated depreciation	(191,976		)	(182,453		)
Property and Equipment, net	$	135,011		$	129,548

The Company recognized $11,062 and $11,002 in depreciation expense related to property and equipment for the six months ended June 30, 2012 and 2011, respectively.

Accrued Liabilities

Accrued liabilities on the accompanying Consolidated Balance Sheets consist of:

	June 30, 2012		December 31, 2011
Accrued employee compensation	$	31,728	$	48,112
Accrued employee benefits and other personnel	5,359		5,408
Accrued consulting, outsourcing and professional fees	16,850		17,477
Accrued brokerage fees	7,586		8,665
Accrued sub-advisory, distribution and other asset management fees	16,657		17,091
Accrued dividend payable	—		26,518
Other accrued liabilities	22,722		23,773
Total accrued liabilities	$	100,902	$	147,044

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Investment In Unconsolidated Affiliate (Tables)

6 Months Ended

Jun. 30, 2012

Investment In Unconsolidated Affiliate [Abstract]

Condensed Statement Of Operations Of LSV

The following table contains the condensed statements of operations of LSV for the three months ended June 30, 2012 and 2011:

	Three Months Ended
	June 30,
	2012		2011
Revenues	$	69,189	$	81,748
Net income	57,372		72,018

The following table contains the condensed statements of operations of LSV for the six months ended June 30, 2012 and 2011:

	Six Months Ended
	June 30,
	2012		2011
Revenues	$	146,654	$	161,150
Net income	124,045		141,964

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Commitments And Contingencies

6 Months Ended

Jun. 30, 2012

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingencies

Commitments and Contingencies

In the normal course of business, the Company is party to various claims and legal proceedings.

One of SEI’s principal subsidiaries, SIDCO, has been named as a defendant in certain putative class action complaints (the Complaints) related to leveraged exchange traded funds (ETFs) advised by ProShares Advisors, LLC. The first complaint was filed on August 5, 2009. To date, the Complaints have been filed in the United States District Court for the Southern District of New York and in the United States District Court for the District of Maryland. The three complaints filed in the District of Maryland have been voluntarily dismissed by the plaintiffs. Two of them were subsequently re-filed in the Southern District of New York. Two of the complaints filed in the Southern District of New York have also been voluntarily dismissed by plaintiffs. The Complaints are purportedly made on behalf of all persons that purchased or otherwise acquired shares in various ProShares leveraged ETFs pursuant or traceable to allegedly false and misleading registration statements, prospectuses and statements of additional information. The Complaints name as defendants ProShares Advisors, LLC; ProShares Trust; ProShares Trust II, SIDCO, and various officers and trustees to ProShares Advisors, LLC; ProShares Trust and ProShares Trust II. The Complaints allege that SIDCO was the distributor and principal underwriter for the various ProShares leveraged ETFs that were distributed to authorized participants and ultimately shareholders. The complaints allege that the registration statements for the ProShares ETFs were materially false and misleading because they failed adequately to describe the nature and risks of the investments. The Complaints allege that SIDCO is liable for these purportedly material misstatements and omissions under Section 11 of the Securities Act of 1933. The Complaints seek unspecified compensatory and other damages, reasonable costs and other relief. Defendants have moved to consolidate the complaints, which motion has been granted. The Court appointed lead plaintiff on July 13, 2010, and an amended consolidated class action complaint was filed on September 25, 2010 asserting substantially the same claims. Defendants moved to dismiss on November 15, 2010. On December 16, 2010, lead plaintiff informed the Court and Defendants that lead plaintiff elected to file a second amended consolidated complaint, which was filed on January 31, 2011. Defendants filed a motion to dismiss the second complaint on March 17, 2011. Oral argument on this motion was held on February 2, 2012. While the outcome of this litigation is uncertain given its early phase, SEI believes that it has valid defenses to plaintiffs’ claims and intends to defend the lawsuits vigorously.

SEI has been named in six lawsuits filed in Louisiana. Five lawsuits were filed in the 19th Judicial District Court for the Parish of East Baton Rouge, State of Louisiana. One of the five actions purports to set forth claims on behalf of a class and also names SPTC as a defendant. Two of the other actions also name SPTC as a defendant. All five actions name various defendants in addition to SEI, and, in all five actions, the plaintiffs purport to bring a cause of action under the Louisiana Securities Act. The putative class action originally included a claim against SEI and SPTC for an alleged violation of the Louisiana Unfair Trade Practices Act. Two of the other five actions include claims for violations of the Louisiana Racketeering Act and possibly conspiracy. In addition, another group of plaintiffs have filed a lawsuit in the 23rd Judicial District Court for the Parish of Ascension, State of Louisiana, against SEI and SPTC and other defendants asserting claims of negligence, breach of contract, breach of fiduciary duty, violations of the uniform fiduciaries law, negligent misrepresentation, detrimental reliance, violations of the Louisiana Securities Act and Louisiana Racketeering Act and conspiracy. The underlying allegations in all the actions are purportedly related to the role of SPTC in providing back-office services to Stanford Trust Company. The petitions allege that SEI and SPTC aided and abetted or otherwise participated in the sale of “certificates of deposit” issued by Stanford International Bank. Two of the five actions filed in East Baton Rouge have been removed to federal court, and plaintiffs’ motions to remand are pending. These two cases have been transferred by the Judicial Panel on Multidistrict Litigation to United States District Court for the Northern District of Texas. On August 31, 2011, the United States District Court for the Northern District of Texas issued an order and judgment that the causes of action alleged against SEI and SPTC in the two remanded actions were preempted by federal law and the Court dismissed these cases with prejudice. The Court of Appeals for the Fifth Circuit granted an expedited appeal of the United States District Court’s order and judgment. The appeal was briefed, and oral argument was held on February 7, 2012. On March 19, 2012, a panel of the Court of Appeals for the Fifth Circuit reversed the decision of the United States District Court and remanded the actions for further proceedings. On April 2, 2012, SEI filed with the United States Court of Appeals for the Fifth Circuit a petition for rehearing en banc of the panel’s opinion. On April 19, 2012, the Fifth Circuit Court of Appeals denied the petition for rehearing.

The case filed in Ascension Parish was also removed to federal court and transferred by the Judicial Panel on Multidistrict Litigation to the Northern District of Texas. The schedule for responding to that complaint has not yet been established. The plaintiffs in the remaining two cases in East Baton Rouge have granted SEI an extension to respond to the filings. SEI and SPTC filed exceptions in the putative class action pending in East Baton Rouge, which the Court granted in part and dismissed the claims under the Louisiana Unfair Trade Practices Act and denied in part as to the other exceptions. SEI and SPTC filed an answer to the East Baton Rouge putative class action; plaintiffs filed a motion for class certification; and SEI and SPTC also filed a motion for summary judgment against certain named plaintiffs which the Court stated will not be set for hearing until after the hearing on the class certification motion. Following the decision by the United States District Court for the Northern District of Texas, the Court in the East Baton Rouge action issued an order staying the proceedings in the East Baton Rouge class action pending the outcome of the appeal of the order and judgment of the United States District Court for the Northern District of Texas. Following the panel opinion of the Court of Appeals on March 19, 2012, the Court in the East Baton Rouge action scheduled a hearing on class certification for September 20, 2012. On July 18, 2012, the Company filed a petition for certiorari in the United States Supreme Court, seeking review of the decision by the United States Court of Appeals for the Eleventh Circuit to permit the claims against SEI to proceed. The Company believes that the trial court correctly concluded that the claims against SEI were barred by the federal Securities Litigation Uniform Standards Act and is requesting that the Supreme Court reinstate that dismissal. While the outcome of this litigation is uncertain given its early phase, SEI and SPTC believe that they have valid defenses to plaintiffs’ claims and intend to defend the lawsuits vigorously.

Because of the uncertainty of the make-up of the classes, the specific theories of liability that may survive a motion to dismiss, the 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.

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Shareholders' Equity

6 Months Ended

Jun. 30, 2012

Stockholders' Equity Note [Abstract]

Shareholders' Equity

Shareholders’ Equity

Stock-Based Compensation

The Company currently has one active equity compensation plan, the 2007 Equity Compensation Plan (the 2007 Plan), which provides for the grant of incentive stock options, non-qualified stock options and stock appreciation rights with respect to up to 20 million shares of common stock of the Company, subject to adjustment for stock splits, reclassifications, mergers and other events. Permitted grantees under the 2007 Plan include employees, non-employee directors and consultants who perform services for the Company. The plan is administered by the Compensation Committee of the Board of Directors of the Company. The Company has only granted non-qualified stock options under the plan. 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 specified diluted earnings per share targets are achieved, and the remaining 50 percent when secondary, higher specified diluted earnings per share targets are achieved. The amount of stock-based compensation expense is based upon management’s estimate of when the earnings per share targets may be achieved.

The Company discontinued any further grants under the Company’s 1998 Equity Compensation Plan (the 1998 Plan) as a result of the approval of the 2007 Plan. No options are available for grant from this plan. Grants made from the 1998 Plan continue in effect under the terms of the grant.

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended June 30, 2012 and 2011, respectively, as follows:

	Three Months Ended
	June 30,
	2012			2011
Stock-based compensation expense	$	3,865		$	3,810
Less: Deferred tax benefit	(1,376		)	(1,427		)
Stock-based compensation expense, net of tax	$	2,489		$	2,383

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the six months ended June 30, 2012 and 2011, respectively, as follows:

	Six Months Ended
	June 30,
	2012			2011
Stock-based compensation expense	$	7,898		$	7,542
Less: Deferred tax benefit	(2,808		)	(2,825		)
Stock-based compensation expense, net of tax	$	5,090		$	4,717

As of June 30, 2012, there was approximately $41,397 of unrecognized compensation cost remaining, adjusted for estimated forfeitures, related to unvested employee stock options that management expects will vest and is being amortized. The Company estimates that compensation cost will be recognized according to the following schedule:

Period	Stock-Based Compensation Expense
Remainder of 2012	$	7,639
2013	12,715
2014	12,521
2015	3,850
2016	2,359
2017	2,313
	$	41,397

The Company issues new common shares associated with the exercise of stock options. The total intrinsic value of options exercised during the six months ended June 30, 2012 was $4,327. The total options exercisable as of June 30, 2012 had an intrinsic value of $26,977. The total intrinsic value for options exercisable is calculated as the difference between the market value of the Company’s common stock as of June 30, 2012 and the exercise price of the shares. The market value of the Company’s common stock as of June 30, 2012 was $19.89 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of June 30, 2012 was $17.37. Total options that were outstanding and exercisable as of June 30, 2012 were 25,564,000 and 10,712,000, respectively.

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 4,098,000 shares at a total cost of $79,879 during the six months ended June 30, 2012. As of June 30, 2012, the Company has $116,397 of authorization remaining for the purchase of common stock under the program.

The Company immediately retires its common stock when purchased. Upon retirement, the Company reduces Capital in excess of par value for the average capital per share outstanding and the remainder is charged against Retained earnings. If the Company reduces its Retained earnings to zero, any subsequent purchases of common stock will be charged entirely to Capital in excess of par value.

Cash Dividend

OnMay 23, 2012, the Board of Directors declared a cash dividend of $0.15 per share on the Company's common stock, which was paid on June 26, 2012, to shareholders of record on June 18, 2012. Cash dividends declared during the six months ended June 30, 2012 and 2011 were $26,117 and $22,041, respectively.

Noncontrolling Interest

The following table provides a reconciliation of Noncontrolling interest on the Consolidated Balance Sheet for the period from January 1, 2012 to June 30, 2012:

	Noncontrolling interest
Balance, January 1, 2012	$	16,143
Net income attributable to noncontrolling interest	454
Foreign currency translation adjustments	329
Balance, June 30, 2012	$	16,926

The following table provides a reconciliation of Noncontrolling interest on the Consolidated Balance Sheet for the period from January 1, 2011 to June 30, 2011:

	Noncontrolling interest
Balance, January 1, 2011	$	15,155
Net income attributable to noncontrolling interest	822
Foreign currency translation adjustments	925
Balance, June 30, 2011	$	16,902

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Marketable Securities

6 Months Ended

Jun. 30, 2012

Marketable Securities [Abstract]

Marketable Securities

Marketable Securities

Investments Available for Sale

Investments available for sale classified as non-current assets consist of:

	At June 30, 2012
	Cost Amount		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
SEI-sponsored mutual funds	$	12,736	$	11	$	(326	)	$	12,421
Other mutual funds	28		4		—			32
Debt securities	64,309		4,476		—			68,785
	$	77,073	$	4,491	$	(326	)	$	81,238

	At December 31, 2011
	Cost Amount		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
SEI-sponsored mutual funds	$	8,243	$	48	$	(360	)	$	7,931
Other mutual funds	69		10		—			79
Debt securities	70,604		4,394		—			74,998
	$	78,916	$	4,452	$	(360	)	$	83,008

Net unrealized holding gains at June 30, 2012 and December 31, 2011 were $2,593 (net of income tax expense of $1,572) and $2,574 (net of income tax expense of $1,518), respectively. These net unrealized gains are reported as a separate component of Accumulated other comprehensive income on the accompanying Consolidated Balance Sheets.

There were no material gross realized gains or losses from available-for-sale securities during the six months ended June 30, 2012 and 2011. Gains and losses from available-for-sale securities are reflected in Net gain from investments on the accompanying Consolidated Statements of Operations.

The Company’s debt securities classified as available-for-sale securities are issued by GNMA and are backed by the full faith and credit of the U.S. government. These securities were purchased to satisfy applicable regulatory requirements of SEI Private Trust Company (SPTC) and have maturity dates which range from 2020 to 2041.

Trading Securities

Trading securities of the Company consist of:

	At June 30, 2012
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SIV securities	$	139,188	$	—	$	(91,001	)	$	48,187
LSV-sponsored mutual funds	2,049		1,816		—			3,865
Other investments	1,215		—		(14		)	1,201
	$	142,452	$	1,816	$	(91,015	)	$	53,253

	At December 31, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SIV securities	$	146,363	$	—	$	(94,955	)	$	51,408
LSV-sponsored mutual funds	2,049		1,653		—			3,702
Other investments	1,215		—		—			1,215
	$	149,627	$	1,653	$	(94,955	)	$	56,325

The Company records all of its trading securities on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these securities are recognized in Net gain from investments on the accompanying Consolidated Statements of Operations.

During the six months ended June 30, 2012 and 2011, the Company recognized gains from SIV securities of $3,954 and $4,920, respectively. Of the gains recognized during the six months ended June 30, 2012, $4,463 resulted from cash payments received from the SIV securities offset by losses of $509 which resulted from a decrease in fair value at June 30, 2012. Of the gains recognized during the six months ended June 30, 2011, $6,232 resulted from cash payments received from the SIV securities offset by losses of $1,312 which resulted from a decrease in fair value at June 30, 2011. The net gains from the SIV securities are reflected in Net gain from investments on the accompanying Consolidated Statements of Operations.

In January 2011, the Company sold the senior note obligation originally issued by Stanfield Victoria. There was no gain or loss recognized by the Company from the sale of the note in 2011 as the fair value of the Stanfield Victoria note at December 31, 2010 was not different than the sale price received.

The Company has an investment related to the startup of mutual funds sponsored by LSV. These are U.S. dollar denominated funds that invests primarily in securities of Canadian and Australian 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 net gains (losses) from the change in fair value of the funds during the three and six months ended June 30, 2012 and 2011 were minimal.

Securities Owned

The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency and commercial paper securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings. The securities had a fair value of $21,057 and $20,949 at June 30, 2012 and December 31, 2011, respectively. The net gains (losses) from the change in fair value of the securities during the three and six months ended June 30, 2012 and 2011 were minimal.

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Lines Of Credit

6 Months Ended

Jun. 30, 2012

Line of Credit Facility [Abstract]

Lines Of Credit

Lines of Credit

On February 2, 2012 (the Closing Date), the Company entered into a new five-year $300,000 Credit Agreement (the Credit Facility) with Wells Fargo Bank, National Association, and a syndicate of other lenders. The Credit Facility became available on the Closing Date and replaced the five-year Credit Agreement with JP Morgan Chase Bank, N.A. The Credit Facility is scheduled to expire in February 2017, 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 1.25 percent above LIBOR. There is also a commitment fee equal to 0.15 percent per annum on the daily unused portion of the facility. The aggregate amount of the Credit Facility may be increased by an additional $100,000 under certain conditions set forth in the agreement. The Credit Facility contains covenants that restrict the ability of the Company to engage in mergers, consolidations, asset sales, investments, transactions with affiliates, or to incur liens, as defined in the agreement. In the event of a default under the Credit Facility, the Company would also be restricted from paying dividends on, or repurchasing, its common stock without the approval of the lenders. None of the covenants of the Credit Facility negatively affect the Company’s liquidity or capital resources. Both the interest rate and commitment fee prices may increase if the Company’s leverage ratio reaches certain levels. Upon the occurrence of certain financial or economic events, significant corporate events, or certain other events of default constituting an event of default under the Credit Facility, all loans outstanding may be declared immediately due and payable and all commitments under the agreement may be terminated. The Company had no borrowings through the Credit Facility at June 30, 2012. The Company was in compliance with all covenants of the Credit Facility at June 30, 2012.

The Company’s Canadian subsidiary has a credit facility agreement (the Canadian Credit Facility) for the purpose of facilitating the settlement of mutual fund transactions. The Canadian Credit Facility has no stated expiration date. The amount of the facility is limited to $2,000 Canadian dollars or the equivalent amount in U.S. dollars. The Canadian Credit Facility does not contain any covenants which restrict the liquidity or capital resources of the Company. The Company had no borrowings under the Canadian Credit Facility and was in compliance with all covenants during the three months ended June 30, 2012.

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Accumulated Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2012

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Comprehensive Income (Loss)

Accumulated Comprehensive Income

Accumulated other comprehensive income, net of tax, consists of:

	Foreign Currency Translation Adjustments			Unrealized Holding Gains (Losses) on Investments		Accumulated Other Comprehensive Income
Total accumulated comprehensive income at December 31, 2011	$	(2,043	)	$	2,574	$	531
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2011	1,369			—		1,369
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2011	$	(674	)	$	2,574	$	1,900
Total comprehensive income for the six months ended June 30, 2012	$	547		$	19	$	566
Less: Total comprehensive income attributable to noncontrolling interest for the six months ended June 30, 2012	(329		)	—		(329		)
Total comprehensive income attributable to SEI Investments Company for the six months ended June 30, 2012	$	218		$	19	$	237
Total accumulated comprehensive income at June 30, 2012	$	(1,496	)	$	2,593	$	1,097
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at June 30, 2012	1,040			—		1,040
Total accumulated comprehensive income attributable to SEI Investments Company at June 30, 2012	$	(456	)	$	2,593	$	2,137

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Investment In Unconsolidated Affiliate (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended					1 Months Ended		3 Months Ended	6 Months Ended	1 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 LSV [Member]	Dec. 31, 2011 LSV [Member]	Jul. 31, 2012 LSV Employee Group II [Member]	Apr. 30, 2011 LSV Employee Group II [Member]	Jun. 30, 2012 LSV Employee Group II [Member]	Jun. 30, 2012 LSV Employee Group II [Member]	Apr. 30, 2011 Bank Of America [Member] LSV Employee Group II [Member]	Jun. 30, 2012 Maximum [Member] LSV [Member]
Investments in and Advances to Affiliates [Line Items]
Income (Loss) from Equity Method Investments	$ 22,712	$ 29,530	$ 50,042	$ 58,479
Equity method investment, ownership percentage						39.80%	41.20%						50.00%
Total investment in LSV	63,553		63,553		60,954
Investment in LSV in excess of the underlying equity in net assets	3,499		3,499
Partnership distribution payments received from LSV			47,443	50,760
Variable interest entity, principal payment								272			468
Variable interest entity, unpaid principal balance of the term loan								2,457		2,729	2,729
Amount financed through new term loan												3,655
Purchase partnership interest									4,300
Goodwill						$ 3,062
Maturity of term loan, years										four

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Accumulated Comprehensive Income (Loss) (Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss), Foreign Currency Translation Adjustments	$ (456)		$ (456)		$ (674)
Accumulated other comprehensive income (loss), Unrealized Holding Gains (Losses) on Investments	2,593		2,593		2,574
Accumulated Other Comprehensive Income (Loss)	2,137		2,137		1,900
Total comprehensive loss, Foreign Currency Translation Adjustments	(2,156)	1,467	547	4,295
Total comprehensive loss, Unrealized Holding Gains (Losses) on Investments			19
Total other comprehensive income, net of tax	(2,108)	2,255	566	4,810
Total comprehensive loss attributable to noncontrolling interest, Foreign Currency Translation Adjustments			(329)	(925)
Total comprehensive income attributable to noncontrolling interest, Unrealized Holding Gains (Losses) on Investments			0
Total comprehensive loss attributable to noncontrolling interest			(329)
Total comprehensive income attributable to SEI Investments Company, Foreign Currency Translation Adjustments			218
Total comprehensive (loss) attributable to SEI Investments Company, Unrealized Holding Gains (Losses) on Investments			19
Total comprehensive income attributable to SEI Investments Company			237
SEI Investments Company [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss), Foreign Currency Translation Adjustments	(1,496)		(1,496)		(2,043)
Accumulated other comprehensive income (loss), Unrealized Holding Gains (Losses) on Investments	2,593		2,593		2,574
Accumulated Other Comprehensive Income (Loss)	1,097		1,097		531
Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss), Foreign Currency Translation Adjustments	1,040		1,040		1,369
Accumulated other comprehensive income (loss), Unrealized Holding Gains (Losses) on Investments	0		0		0
Accumulated Other Comprehensive Income (Loss)	$ 1,040		$ 1,040		$ 1,369

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Summary Of Significant Accounting Policies (Policy)

6 Months Ended

Jun. 30, 2012

Accounting Policies [Abstract]

Nature Of Operations

Nature of Operations

SEI Investments Company (the Company), a Pennsylvania corporation, provides investment processing, investment management, and investment operations solutions to corporations, financial institutions, financial advisors, and ultra-high-net-worth families in the United States, Canada, the United Kingdom, continental Europe, and other various locations throughout the world. Investment processing solutions consist of application and business process outsourcing services, professional services and transaction-based services. Revenues from investment processing solutions are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations, except for fees earned associated with trade execution services.

Investment management programs consist of mutual funds, alternative investments and separate accounts. These include a series of money market, equity, fixed-income and alternative investment portfolios, primarily in the form of registered investment companies. The Company serves as the administrator and investment advisor for many of these products. Revenues from investment management programs are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Investment operations solutions offer investment managers support for traditional investment products such as mutual funds, collective investment trusts, exchange-traded funds, and institutional and separate accounts, by providing outsourcing services including fund and investment accounting, administration, reconciliation, investor servicing and client reporting. These solutions also provide support to managers focused on alternative investments who manage hedge funds, funds of hedge funds, private equity funds and real estate funds, across registered, partnership and separate account structures domiciled in the United States and overseas. Revenues from investment operations solutions are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Basis Of Presentation

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 has been condensed or omitted. The interim financial information is unaudited but reflects all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of financial position of the Company as of June 30, 2012, the results of operations for the three and six months ended June 30, 2012 and 2011, and cash flows for the six month periods ended June 30, 2012 and 2011. 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, 2011.

There have been no significant changes in significant accounting policies during the six months ended June 30, 2012 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2011.

Restricted Cash

Restricted Cash

Restricted cash includes $5,000 at June 30, 2012 and December 31, 2011 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $1,000 at June 30, 2012 and December 31, 2011 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 for broker-dealers.

Earnings Per Share

Earnings per Share

The calculations of basic and diluted earnings per share for the three months ended June 30, 2012 and 2011 are:

	For the Three Months Ended June 30, 2012
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	49,555	174,830	$	0.28
Dilutive effect of stock options	—		1,083
Diluted earnings per common share	$	49,555	175,913	$	0.28

	For the Three Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	53,603	184,585	$	0.29
Dilutive effect of stock options	—		2,435
Diluted earnings per common share	$	53,603	187,020	$	0.29

Employee stock options to purchase 16,637,000 and 7,675,000 shares of common stock, with an average exercise price of $22.75 and $28.25, were outstanding during the three months ended June 30, 2012 and 2011, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

The calculations of basic and diluted earnings per share for the six months ended June 30, 2012 and 2011 are:

	For the Six Months Ended June 30, 2012
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	99,520	175,589	$	0.57
Dilutive effect of stock options	—		1,202
Diluted earnings per common share	$	99,520	176,791	$	0.56

	For the Six Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)	Per Share Amount
Basic earnings per common share	$	111,331	185,186	$	0.60
Dilutive effect of stock options	—		2,571
Diluted earnings per common share	$	111,331	187,757	$	0.59

Employee stock options to purchase 14,017,000 and 7,606,000 shares of common stock, with an average exercise price of $23.40 and $28.26, were outstanding during the six months ended June 30, 2012 and 2011, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

Statements Of Cash Flows

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.

Equity Method Investments, Policy [Policy Text Block]

The Company has an investment in the general partnership LSV Asset Management (LSV). LSV is a registered investment advisor that provides investment advisory services to institutions, including pension plans and investment companies. LSV is currently an investment sub-advisor for a small number of SEI-sponsored mutual funds. The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations.

Consolidation, Variable Interest Entity, Policy [Policy Text Block]

The Company does not have a significant equity investment in any of the VIEs and does not have an obligation to enter into any guarantee agreements with the VIEs. The Company is not the primary beneficiary of the VIEs because the expected fees and the expected return on any investment into the VIE by the Company relative to the expected returns of the VIE to the equity investor holders does not approach 50 percent of the expected losses or gains of the VIEs. Therefore, the Company is not required to consolidate any investment products that are VIEs into its financial statements. The Company’s variable interest in the VIEs, which consists of management fees and in some situations, seed capital, is not considered a significant variable interest.

The risks to the Company associated with its involvement with any of the investment products that are VIEs are limited to the cash flows received from the revenue generated for asset management, administration and distribution services and any equity investments in the VIEs. Both of these items are not significant. The Company has no other financial obligation to the VIEs.

Amounts relating to fees received from the VIEs included in Receivables and amounts relating to equity investments in the VIEs included in Investments Available for Sale on the Company’s Consolidated Balance Sheets are not significant to the total assets of the Company.

Fair Value of Financial Instruments, Policy [Policy Text Block]

The fair value of the Company’s financial assets and liabilities 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 equity and fixed-income mutual funds that are quoted daily. Level 2 financial assets consist of Government National Mortgage Association (GNMA) and other U.S. government agency securities that are single issuer pools that are valued based on current market data for the specific issue owned or pools of similar securities. Level 3 financial assets primarily consist of senior note obligations issued by SIVs. The Company had no Level 3 financial liabilities at June 30, 2012 or December 31, 2011. There were no transfers of financial assets between levels within the fair value hierarchy during the six months ended June 30, 2012.

Marketable Securities, Trading Securities, Policy [Policy Text Block]

The Company records all of its trading securities on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these securities are recognized in Net gain from investments on the accompanying Consolidated Statements of Operations.

Marketable Securities, Policy [Policy Text Block]

The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency and commercial paper 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.

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Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2012

Marketable Securities [Abstract]

Investments Available For Sale

Investments available for sale classified as non-current assets consist of:

	At June 30, 2012
	Cost Amount		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
SEI-sponsored mutual funds	$	12,736	$	11	$	(326	)	$	12,421
Other mutual funds	28		4		—			32
Debt securities	64,309		4,476		—			68,785
	$	77,073	$	4,491	$	(326	)	$	81,238

	At December 31, 2011
	Cost Amount		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
SEI-sponsored mutual funds	$	8,243	$	48	$	(360	)	$	7,931
Other mutual funds	69		10		—			79
Debt securities	70,604		4,394		—			74,998
	$	78,916	$	4,452	$	(360	)	$	83,008

Trading Securities

Trading securities of the Company consist of:

	At June 30, 2012
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SIV securities	$	139,188	$	—	$	(91,001	)	$	48,187
LSV-sponsored mutual funds	2,049		1,816		—			3,865
Other investments	1,215		—		(14		)	1,201
	$	142,452	$	1,816	$	(91,015	)	$	53,253

	At December 31, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SIV securities	$	146,363	$	—	$	(94,955	)	$	51,408
LSV-sponsored mutual funds	2,049		1,653		—			3,702
Other investments	1,215		—		—			1,215
	$	149,627	$	1,653	$	(94,955	)	$	56,325

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Shareholders' Equity (Schedule Of Recognition Of Compensation Cost) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation Expense	$ 41,397
Remainder Of 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation Expense	7,639
2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation Expense	12,715
2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation Expense	12,521
2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation Expense	3,850
2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation Expense	2,359
2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation Expense	$ 2,313

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Fair Value Measurements (Fair Value Of Certain Financial Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	$ 12,453	$ 8,010
Fixed income available-for-sale securities	68,785	74,998
Fixed income securities owned	21,057	20,949
Trading securities	53,253	56,325
Assets, fair value	155,548	160,282
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	12,453	8,010
Fixed income available-for-sale securities	0	0
Fixed income securities owned	0	0
Trading securities	3,865	3,702
Assets, fair value	16,318	11,712
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	0	0
Fixed income available-for-sale securities	68,785	74,998
Fixed income securities owned	21,057	20,949
Trading securities	0	0
Assets, fair value	89,842	95,947
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	0	0
Fixed income available-for-sale securities	0	0
Fixed income securities owned	0	0
Trading securities	49,388	52,623
Assets, fair value	$ 49,388	$ 52,623

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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Statement of Income and Comprehensive Income [Abstract]
Net income	$ 49,739	$ 54,113	$ 99,974	$ 112,153
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(2,156)	1,467	547	4,295
Unrealized holding loss on investments:
Unrealized holding gains (losses) during the period, net of income taxes of $70, $348, $77 and $236	25	816	56	646
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	23	(28)	(37)	(131)
Unrealized Gain (Loss) on Investments	48	788	19	515
Total other comprehensive income, net of tax	(2,108)	2,255	566	4,810
Comprehensive income	47,631	56,368	100,540	116,963
Comprehensive income attributable to the noncontrolling interest	(30)	(1,015)	(783)	(1,747)
Comprehensive income attributable to SEI Investments Company	$ 47,601	$ 55,353	$ 99,757	$ 115,216

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Variable Interest Entities - Investment Products

6 Months Ended

Jun. 30, 2012

Variable Interest Entities - Investment Products [Abstract]

Variable Interest Entities - Investment Products

Variable Interest Entities – Investment Products

The Company has 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. Clients are the equity investors and participate in proportion to their ownership percentage in the net income and net capital gains 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. Some of the Company’s investment products have been determined to be VIEs at inception.

The Company does not have a significant equity investment in any of the VIEs and does not have an obligation to enter into any guarantee agreements with the VIEs. The Company is not the primary beneficiary of the VIEs because the expected fees and the expected return on any investment into the VIE by the Company relative to the expected returns of the VIE to the equity investor holders does not approach 50 percent of the expected losses or gains of the VIEs. Therefore, the Company is not required to consolidate any investment products that are VIEs into its financial statements. The Company’s variable interest in the VIEs, which consists of management fees and in some situations, seed capital, is not considered a significant variable interest.

The risks to the Company associated with its involvement with any of the investment products that are VIEs are limited to the cash flows received from the revenue generated for asset management, administration and distribution services and any equity investments in the VIEs. Both of these items are not significant. The Company has no other financial obligation to the VIEs.

Amounts relating to fees received from the VIEs included in Receivables and amounts relating to equity investments in the VIEs included in Investments Available for Sale on the Company’s Consolidated Balance Sheets are not significant to the total assets of the Company.

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Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2012

Stockholders' Equity Note [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended June 30, 2012 and 2011, respectively, as follows:

	Three Months Ended
	June 30,
	2012			2011
Stock-based compensation expense	$	3,865		$	3,810
Less: Deferred tax benefit	(1,376		)	(1,427		)
Stock-based compensation expense, net of tax	$	2,489		$	2,383

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the six months ended June 30, 2012 and 2011, respectively, as follows:

	Six Months Ended
	June 30,
	2012			2011
Stock-based compensation expense	$	7,898		$	7,542
Less: Deferred tax benefit	(2,808		)	(2,825		)
Stock-based compensation expense, net of tax	$	5,090		$	4,717

Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]

The Company estimates that compensation cost will be recognized according to the following schedule:

Period	Stock-Based Compensation Expense
Remainder of 2012	$	7,639
2013	12,715
2014	12,521
2015	3,850
2016	2,359
2017	2,313
	$	41,397

Schedule Of Reconciliation Of Noncontrolling Interest On The Consolidated Balance Sheet

The following table provides a reconciliation of Noncontrolling interest on the Consolidated Balance Sheet for the period from January 1, 2012 to June 30, 2012:

	Noncontrolling interest
Balance, January 1, 2012	$	16,143
Net income attributable to noncontrolling interest	454
Foreign currency translation adjustments	329
Balance, June 30, 2012	$	16,926

The following table provides a reconciliation of Noncontrolling interest on the Consolidated Balance Sheet for the period from January 1, 2011 to June 30, 2011:

	Noncontrolling interest
Balance, January 1, 2011	$	15,155
Net income attributable to noncontrolling interest	822
Foreign currency translation adjustments	925
Balance, June 30, 2011	$	16,902

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Composition Of Certain Financial Statement Captions (Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Composition Of Certain Financial Statement Captions [Abstract]
Buildings	$ 137,421		$ 137,421		$ 136,949
Equipment	65,884		65,884		64,256
Land	9,929		9,929		9,929
Purchased software	90,580		90,580		77,971
Furniture and fixtures	18,245		18,245		17,999
Leasehold improvements	4,820		4,820		4,558
Construction in progress	108		108		339
Property and Equipment, gross	326,987		326,987		312,001
Less: Accumulated depreciation	(191,976)		(191,976)		(182,453)
Property and Equipment, net	135,011		135,011		129,548
Depreciation expense	$ 5,630	$ 5,391	$ 11,062	$ 11,002

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Subsequent Events

6 Months Ended

Jun. 30, 2012

Subsequent Events [Abstract]

Subsequent Events [Text Block]

Subsequent Events

On July 31, 2012, the Company, MetLife International Holdings, Inc. (MetLife) and International Finance Corporation (IFC) entered into a definitive agreement with Baring Asset Management Limited to sell all ownership interests in SEI Asset Korea Co., Ltd. (SEI AK). SEI AK is located in South Korea and provides domestic equity and fixed income investment management services to financial institutions and pension funds. Consummation of the acquisition of SEI AK under the definitive agreement is subject to regulatory approvals and other customary closing conditions.

The Company's ownership interest in SEI AK is 56.1 percent as of July 31, 2012. The Company consolidates the assets, liabilities and operations of SEI AK in its Consolidated Financial Statements. The ownership interests in SEI AK for MetLife and IFC is reflected in Noncontrolling interest in the Consolidated Financial Statements. Upon closing of the agreement, the then current cash balance of SEI AK will be distributed to the Company, Metlife and IFC in accordance with the ownership interests.

As of June 30, 2012, SEI AK has total corporate assets of $48,776, of which $42,553 is included in Cash and Cash equivalents on the Consolidated Balance Sheets. All other accounts of SEI AK are not material to any financial statement line item in the Consolidated Financial Statements.

The Company did not provide U.S. deferred taxes on the undistributed earnings of SEI AK since its inception because those earnings were considered to be indefinitely reinvested. As a result of the potential sale of SEI AK, the Company no longer considers undistributed earnings to be indefinitely reinvested and, therefore, must accrue approximately $5,000 for U.S. deferred taxes during the three months ended September 30, 2012 on the cumulative undistributed earnings of SEI AK.

If the requisite regulatory approvals are obtained, the other conditions to closing are satisfied or waived and the transaction is consummated, then the Company expects to recognize a net after tax gain on the sale of its shares of SEI AK depending upon revenue during a pre-closing measurement period and specified revenues during three one-year periods after the closing.