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Commitments and Contingencies Commitments and Contingencies - Income Tax Reserve (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]    
Liability for Uncertain Tax Positions, Noncurrent $ 1,600,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent $ 1,600,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
Deferred Rent Credit, Current $ 400,000us-gaap_DeferredRentCreditCurrent $ 410,000us-gaap_DeferredRentCreditCurrent