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Derivatives (Details 1)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2012
USD ($)
Bank
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Derivative [Line Items]        
Maximum Remaining Maturity of Foreign Currency Derivatives   2 years    
Other   $ 4,771 $ 9,850 $ (338)
Derivative, Net Hedge Ineffectiveness Gain (Loss)   0 0  
Foreign Exchange Contracts [Member]        
Derivative [Line Items]        
Other   5,221 10,309  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net   (342) 847  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contracts [Member]        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net   174 (39)  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contracts [Member]        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net   (516) 886  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member]        
Derivative [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net   $ 2,297 $ 8,215  
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivative [Line Items]        
Term of Interest Rate Derivatives 5 years      
Number of Banks Transacted With for Interest Rate Swap Agreements | Bank 3      
Derivative, Amount of Hedged Item $ 100,000      
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivative [Line Items]        
Derivative, Fixed Interest Rate 1.03%