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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
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Deferred Tax Liabilities, Net, Classification [Abstract] |  |
Gross assets | $ 2,952 us-gaap_DeferredTaxAssetsGrossCurrent | $ 2,458 us-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 | 0 us-gaap_DeferredTaxAssetsValuationAllowanceCurrent | 0 us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Current deferred income taxes | (1,414)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | (1,653)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Gross assets | 66,335 us-gaap_DeferredTaxAssetsGrossNoncurrent | 69,483 us-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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