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Income Taxes (Schedule Of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Liabilities, Net, Classification [Abstract]
Gross assets	$ 2,952us-gaap_DeferredTaxAssetsGrossCurrent	$ 2,458us-gaap_DeferredTaxAssetsGrossCurrent
Gross liabilities	(4,366)us-gaap_DeferredTaxLiabilitiesGrossCurrent	(4,111)us-gaap_DeferredTaxLiabilitiesGrossCurrent
Current deferred income tax assets and liabilities	(1,414)seic_DeferredTaxAssetsAndLiabilitiesGrossCurrent	(1,653)seic_DeferredTaxAssetsAndLiabilitiesGrossCurrent
Valuation allowance	0us-gaap_DeferredTaxAssetsValuationAllowanceCurrent	0us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Current deferred income taxes	(1,414)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent	(1,653)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Gross assets	66,335us-gaap_DeferredTaxAssetsGrossNoncurrent	69,483us-gaap_DeferredTaxAssetsGrossNoncurrent
Gross liabilities	(113,581)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent	(121,317)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
Long term deferred income tax assets and liabilities	(47,246)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent	(51,834)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Valuation allowance	(16,509)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent	(14,738)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Long term deferred income taxes	(63,755)us-gaap_DeferredTaxAssetsNetNoncurrent	(66,572)us-gaap_DeferredTaxAssetsNetNoncurrent
Net deferred income tax liability	$ (65,169)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (68,225)us-gaap_DeferredTaxAssetsLiabilitiesNet

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