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Fair Value Measurement (Foreign Currency Forward Contracts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]      
Gains (losses) on intercompany receivables $ 1,100 $ (100) $ (800)
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]      
Derivative Asset, Fair Value, Gross Asset 350 4,010  
Derivative Liability, Fair Value, Gross Liability (6,023) (1,564)  
Fair value, assets (liabilities), net (5,673) 2,446  
Foreign Exchange Forward [Member]      
Derivative [Line Items]      
Forward contracts not designated as hedging instruments net realized gains (losses) (1,600) 0 400
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]      
Derivative [Line Items]      
Notional amount of cash flow hedges 126,000    
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Prepaid Expenses and Other Current Assets [Member]      
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]      
Derivative Asset, Fair Value, Gross Asset   3,962  
Derivative Liability, Fair Value, Gross Liability   (1,510)  
Fair value, assets (liabilities), net   2,452  
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Liabilities [Member]      
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]      
Derivative Asset, Fair Value, Gross Asset 346    
Derivative Liability, Fair Value, Gross Liability (5,945)    
Fair value, assets (liabilities), net (5,599)    
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Prepaid Expenses and Other Current Assets [Member]      
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]      
Derivative Asset, Fair Value, Gross Asset   48  
Derivative Liability, Fair Value, Gross Liability   (54)  
Fair value, assets (liabilities), net   (6)  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Liabilities [Member]      
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]      
Derivative Asset, Fair Value, Gross Asset 4    
Derivative Liability, Fair Value, Gross Liability (78)    
Fair value, assets (liabilities), net (74)    
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]      
Derivative [Line Items]      
Cash flow hedges realized gains (losses) (700) $ 1,200 $ 10,400
Unrealized gain (loss) on cash flow hedges in accumulated other comprehensive income (loss) expected to be recognized in next fiscal year (3,500)    
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]      
Derivative [Line Items]      
Notional amount of cash flow hedges $ 30,400