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Derivatives (Details 1)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2012
USD ($)
Bank
Derivative [Line Items]      
Maximum remaining maturity of foreign currency derivatives 2 years    
Derivative, Net Hedge Ineffectiveness Gain (Loss) $ 0 $ 0  
Net cash losses from settlement (2,921) 10,033  
Foreign Exchange Contract [Member]      
Derivative [Line Items]      
Net cash losses from settlement 2,874    
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 (148) 112  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]      
Derivative [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (65) (232)  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]      
Derivative [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (83) 344  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (3,712) $ 8,617  
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 (in banks) | Bank     3
Derivative amount of hedge     $ 100,000
Variable rate basis     one-month LIBOR
Fixed interest rate     1.03%