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Debt Obligations (6.5% Convertible Senior Notes Narrative) (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Mar. 01, 2014
Feb. 28, 2014
Dec. 31, 2013
Debt Instrument [Line Items]        
Credit facility initiation date Jan. 24, 2014      
Outstanding indebtedness $ 1,230,246,000us-gaap_DebtInstrumentCarryingAmount     $ 882,600,000us-gaap_DebtInstrumentCarryingAmount
Securities Purchase Agreement [Member]        
Debt Instrument [Line Items]        
Credit facility initiation date Feb. 28, 2014      
Value of common stock, warrants and convertible notes issued   30,000,000end_StockWarrantsAndNotesIssuedDuringPeriodValue
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55,000,000end_StockWarrantsAndNotesIssuedDuringPeriodValue
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Common stock, shares issued     2,900,000us-gaap_SharesIssued
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Number of common stock shares warrants can be converted into     700,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
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Warrants exercise price     $ 5.292end_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
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Debt principal amount     $ 17,500,000us-gaap_DebtInstrumentFaceAmount
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Conversion rate     0.2145002us-gaap_DebtInstrumentConvertibleConversionRatio1
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Conversion price     $ 4.662us-gaap_DebtInstrumentConvertibleConversionPrice1
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