XML 48 R38.htm IDEA: XBRL DOCUMENT v3.8.0.1
Fair Value of Financial Instruments (Foreign Currency Forward Contracts) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]        
Accumulated other comprehensive loss $ (46,333)   $ (49,078)  
Foreign Currency Transaction Gain (Loss), before Tax (100) $ 0    
Derivative Assets and Liabilities at Fair Value [Abstract]        
Fair value, assets 1,335   350  
Derivative Liability, Fair Value, Gross Liability (5,001)   (6,023)  
Derivative Assets (Liabilities), at Fair Value, Net (3,666)   (5,673)  
Foreign Currency Forward Contracts [Member]        
Derivative [Line Items]        
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments (100) (200)    
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Other Current and Other Long Term Liabilities [Member]        
Derivative Assets and Liabilities at Fair Value [Abstract]        
Fair value, assets 1,327      
Derivative Liability, Fair Value, Gross Liability (4,834)      
Derivative Assets (Liabilities), at Fair Value, Net (3,507)      
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 31,300      
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 8   4  
Derivative Liability, Fair Value, Gross Liability (167)   (78)  
Derivative Assets (Liabilities), at Fair Value, Net (159)   (74)  
Cash Flow Hedging [Member] | Foreign Currency Forward Contracts [Member]        
Derivative [Line Items]        
Notional amount of cash flow hedges 131,200      
Cash flow hedges realized gains (losses) (1,300) 300    
Cash Flow Hedging Gain (Loss) [Member]        
Derivative [Line Items]        
Accumulated other comprehensive loss $ (1,944) $ 699 $ (3,530) $ 1,546