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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Derivative [Line Items]          
Gains (losses) on intercompany receivables $ 200 $ (800) $ 500 $ (1,100)  
Derivative Assets and Liabilities at Fair Value [Abstract]          
Fair value, assets 1,670   1,670   $ 2,935
Fair value, liabilities (2,800)   (2,800)   (1,064)
Derivative Assets (Liabilities), at Fair Value, Net (1,130)   (1,130)   1,871
Foreign Currency Forward Contracts [Member]          
Derivative [Line Items]          
Forward contracts not designated as hedging instruments net realized gains (losses) (200) 900 (400) 800  
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         2,931
Fair value, liabilities         (1,026)
Derivative Assets (Liabilities), at Fair Value, Net         1,905
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 1,670   1,670    
Fair value, liabilities (2,784)   (2,784)    
Derivative Assets (Liabilities), at Fair Value, Net (1,114)   (1,114)    
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member]          
Derivative [Line Items]          
Notional amount of cash flow hedges 18,600   18,600    
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         4
Fair value, liabilities         (38)
Derivative Assets (Liabilities), at Fair Value, Net         $ (34)
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    
Fair value, liabilities (16)   (16)    
Derivative Assets (Liabilities), at Fair Value, Net (16)   (16)    
Cash Flow Hedging [Member] | Foreign Currency Forward Contracts [Member]          
Derivative [Line Items]          
Notional amount of cash flow hedges 102,300   102,300    
Cash flow hedges realized gains 0 $ 2,300 500 $ 7,300  
Unrealized gains on cash flow hedges in accumulated other comprehensive income (loss) expected to be recognized in the next fiscal year $ (700)   $ (700)