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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 643,260us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 667,446us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash	5,805us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue	5,801us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Receivables from regulated investment companies	47,006us-gaap_DueFromOtherRelatedPartiesCurrent	48,393us-gaap_DueFromOtherRelatedPartiesCurrent
Receivables, net of allowance for doubtful accounts of $667 and $784	200,673us-gaap_ReceivablesNetCurrent	194,419us-gaap_ReceivablesNetCurrent
Securities owned	21,192us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	21,175us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
Other current assets	25,028us-gaap_OtherAssetsCurrent	18,193us-gaap_OtherAssetsCurrent
Total Current Assets	942,964us-gaap_AssetsCurrent	955,427us-gaap_AssetsCurrent
Property and Equipment, net of accumulated depreciation of $246,881 and $241,295	125,855us-gaap_PropertyPlantAndEquipmentNet	125,535us-gaap_PropertyPlantAndEquipmentNet
Capitalized Software, net of accumulated amortization of $228,815 and $218,514	306,728us-gaap_CapitalizedComputerSoftwareNet	309,040us-gaap_CapitalizedComputerSoftwareNet
Investments Available for Sale	74,222us-gaap_AvailableForSaleSecuritiesNoncurrent	77,609us-gaap_AvailableForSaleSecuritiesNoncurrent
Investments in Affiliated Funds, at fair value	4,454us-gaap_OtherMarketableSecuritiesNoncurrent	4,523us-gaap_OtherMarketableSecuritiesNoncurrent
Investment in Unconsolidated Affiliates	51,320us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	54,290us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Other Assets, net	16,442us-gaap_OtherAssetsNoncurrent	16,451us-gaap_OtherAssetsNoncurrent
Total Assets	1,521,985us-gaap_Assets	1,542,875us-gaap_Assets
Current Liabilities:
Accounts payable	6,050us-gaap_AccountsPayableCurrent	10,588us-gaap_AccountsPayableCurrent
Accrued liabilities	152,227us-gaap_AccruedLiabilitiesCurrent	207,429us-gaap_AccruedLiabilitiesCurrent
Deferred income taxes, net	1,298us-gaap_DeferredTaxLiabilitiesCurrent	1,414us-gaap_DeferredTaxLiabilitiesCurrent
Deferred revenue	3,618us-gaap_DeferredRevenueCurrent	1,749us-gaap_DeferredRevenueCurrent
Total Current Liabilities	163,193us-gaap_LiabilitiesCurrent	221,180us-gaap_LiabilitiesCurrent
Deferred Income Taxes	63,742us-gaap_DeferredTaxLiabilitiesNoncurrent	63,755us-gaap_DeferredTaxLiabilitiesNoncurrent
Other Long-term Liabilities	10,791us-gaap_LiabilityForUncertainTaxPositionsNoncurrent	10,327us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
Total Liabilities	237,726us-gaap_Liabilities	295,262us-gaap_Liabilities
Commitments and Contingencies
SEI Investments shareholders' equity:
Common stock, $.01 par value, 750,000 shares authorized; 166,071 and 166,688 shares issued and outstanding	1,661us-gaap_CommonStockValue	1,667us-gaap_CommonStockValue
Capital in excess of par value	854,995us-gaap_AdditionalPaidInCapitalCommonStock	834,615us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings	445,368us-gaap_RetainedEarningsAccumulatedDeficit	420,226us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss, net	(17,765)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	(8,895)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total Shareholders' Equity	1,284,259us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1,247,613us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total Liabilities and Shareholders' Equity	$ 1,521,985us-gaap_LiabilitiesAndStockholdersEquity	$ 1,542,875us-gaap_LiabilitiesAndStockholdersEquity

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