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Derivatives and Risk Management (Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Total asset derivatives $ 0 $ 8,269
Total liability derivatives 3,987 2,334
Derivatives Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Total asset derivatives   4,911
Total liability derivatives 2,531 2,334
Derivatives Designated as Hedging Instruments | Prepaid Expenses and Other Current Assets | Interest Rate Contract    
Derivatives, Fair Value [Line Items]    
Total asset derivatives   0
Derivatives Designated as Hedging Instruments | Prepaid Expenses and Other Current Assets | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Total asset derivatives   4,911
Derivatives Designated as Hedging Instruments | Accrued Liabilities | Interest Rate Contract    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 875 942
Derivatives Designated as Hedging Instruments | Accrued Liabilities | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 724 0
Derivatives Designated as Hedging Instruments | Other Assets | Interest Rate Contract    
Derivatives, Fair Value [Line Items]    
Total asset derivatives   0
Derivatives Designated as Hedging Instruments | Other Long-term Liabilities | Interest Rate Contract    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 932 1,392
Derivatives Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Total asset derivatives   3,358
Total liability derivatives 1,456 0
Derivatives Not Designated as Hedging Instruments | Prepaid Expenses and Other Current Assets | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Total asset derivatives   3,358
Derivatives Not Designated as Hedging Instruments | Accrued Liabilities | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Total liability derivatives $ 1,456 $ 0