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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Derivative [Line Items]          
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months $ 1,700   $ 1,700    
Foreign Currency Transaction Gain (Loss), before Tax (500) $ 400 (1,200) $ 700  
Prepaid Expenses And Other Current Assets and Non-current Other Assets [Domain]          
Derivative Assets and Liabilities at Fair Value [Abstract]          
Fair value, assets 3,815   3,815    
Derivative Liability, Fair Value, Gross Liability (820)   (820)    
Derivative Assets (Liabilities), at Fair Value, Net 2,995   2,995    
Prepaid Expenses and Other Current Assets [Member]          
Derivative Assets and Liabilities at Fair Value [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 2,400   2,400    
Other Current Liabilities [Member]          
Derivative Assets and Liabilities at Fair Value [Abstract]          
Fair value, assets         $ 350
Derivative Liability, Fair Value, Gross Liability         (6,023)
Derivative Assets (Liabilities), at Fair Value, Net         (5,673)
Other Noncurrent Assets [Member]          
Derivative Assets and Liabilities at Fair Value [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 700   700    
Foreign Currency Forward Contracts [Member]          
Derivative [Line Items]          
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments 200 (500) 600 (1,200)  
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses And Other Current Assets and Non-current Other Assets [Domain]          
Derivative Assets and Liabilities at Fair Value [Abstract]          
Fair value, assets 3,787   3,787    
Derivative Liability, Fair Value, Gross Liability (685)   (685)    
Derivative Assets (Liabilities), at Fair Value, Net 3,102   3,102    
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         346
Derivative Liability, Fair Value, Gross Liability         (5,945)
Derivative Assets (Liabilities), at Fair Value, Net         (5,599)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member]          
Derivative [Line Items]          
Notional amount of cash flow hedges 30,800   30,800    
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses And Other Current Assets and Non-current Other Assets [Domain]          
Derivative Assets and Liabilities at Fair Value [Abstract]          
Fair value, assets 28   28    
Derivative Liability, Fair Value, Gross Liability (135)   (135)    
Derivative Assets (Liabilities), at Fair Value, Net (107)   (107)    
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         4
Derivative Liability, Fair Value, Gross Liability         (78)
Derivative Assets (Liabilities), at Fair Value, Net         $ (74)
Cash Flow Hedging [Member] | Foreign Currency Forward Contracts [Member]          
Derivative [Line Items]          
Notional amount of cash flow hedges 147,800   147,800    
Cash flow hedges realized gains (losses) $ 100 $ (500) $ (1,500) $ 0