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Derivative Instruments and Hedging Activities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Gain (loss) recognized on non-designated derivative instruments:    
Gain (loss) recognized on non-designated derivative instruments, total $ 14,809us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet $ 4,494us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Foreign Exchange Contract | Interest expense    
Gain (loss) recognized on non-designated derivative instruments:    
Gain (loss) recognized on non-designated derivative instruments, total (6,291)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		 (6,406)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
Foreign Exchange Contract | Foreign exchange gain (loss), net    
Gain (loss) recognized on non-designated derivative instruments:    
Gain (loss) recognized on non-designated derivative instruments, total $ 21,100us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ForeignCurrencyGainLossMember		 $ 10,900us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ForeignCurrencyGainLossMember