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Derivatives and Risk Management (Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Total asset derivatives   $ 519
Total liability derivatives $ 3,257 2,045
Derivatives Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Total asset derivatives   0
Total liability derivatives 2,430 2,045
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   0
Derivatives Designated as Hedging Instruments | Accrued liabilities | Interest Rate Contract    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 683 834
Derivatives Designated as Hedging Instruments | Accrued liabilities | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 1,209 460
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 538 751
Derivatives Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Total asset derivatives   519
Total liability derivatives 827 0
Derivatives Not Designated as Hedging Instruments | Prepaid expenses and other current assets | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Total asset derivatives   519
Derivatives Not Designated as Hedging Instruments | Accrued liabilities | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Total liability derivatives $ 827 $ 0