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Commitments and Contingencies (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Purchase Obligation, Fiscal Year Maturity [Abstract]      
2015 $ 21,080,000us-gaap_PurchaseObligationDueInNextTwelveMonths    
2016 19,005,000us-gaap_PurchaseObligationDueInSecondYear    
2017 4,722,000us-gaap_PurchaseObligationDueInThirdYear    
Total 44,807,000us-gaap_PurchaseObligation    
Annual fixed fees incurred $ 9,300,000us-gaap_TechnologyServicesCosts $ 12,800,000us-gaap_TechnologyServicesCosts $ 12,800,000us-gaap_TechnologyServicesCosts