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Fair Value of Financial Instruments (Foreign Currency Forward Contracts) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivative [Line Items]          
Gains (losses) on intercompany receivables $ 400 $ 200 $ 700 $ 500  
Derivative Assets and Liabilities at Fair Value [Abstract]          
Fair value, assets 1,015   1,015   $ 4,010
Derivative Liability, Fair Value, Gross Liability (4,946)   (4,946)   (1,564)
Derivative Assets (Liabilities), at Fair Value, Net (3,931)   (3,931)   2,446
Foreign Currency Forward Contracts [Member]          
Derivative [Line Items]          
Forward contracts not designated as hedging instruments net realized gains (losses) (500) (200) (1,200) (400)  
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]          
Derivative Assets and Liabilities at Fair Value [Abstract]          
Fair value, assets         3,962
Derivative Liability, Fair Value, Gross Liability         (1,510)
Derivative Assets (Liabilities), at Fair Value, Net         2,452
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Other Current Liabilities [Member]          
Derivative Assets and Liabilities at Fair Value [Abstract]          
Fair value, assets 1,015   1,015    
Derivative Liability, Fair Value, Gross Liability (4,821)   (4,821)    
Derivative Assets (Liabilities), at Fair Value, Net (3,806)   (3,806)    
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member]          
Derivative [Line Items]          
Notional amount of cash flow hedges 29,800   29,800    
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]          
Derivative Assets and Liabilities at Fair Value [Abstract]          
Fair value, assets         48
Derivative Liability, Fair Value, Gross Liability         (54)
Derivative Assets (Liabilities), at Fair Value, Net         $ (6)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Other Current Liabilities [Member]          
Derivative Assets and Liabilities at Fair Value [Abstract]          
Fair value, assets 0   0    
Derivative Liability, Fair Value, Gross Liability (125)   (125)    
Derivative Assets (Liabilities), at Fair Value, Net (125)   (125)    
Cash Flow Hedging [Member] | Foreign Currency Forward Contracts [Member]          
Derivative [Line Items]          
Notional amount of cash flow hedges 122,500   122,500    
Cash flow hedges realized gains (losses) (500) $ 0 0 $ 500  
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months $ (2,400)   $ (2,400)