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Derivatives (Details 1)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
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 $ 0 $ 0  
Net cash losses from settlement     3,406 6,341  
Foreign Exchange Contract [Member]          
Derivative [Line Items]          
Net cash losses from settlement     3,822    
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 (150) (174) (580) 127  
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 137 (151) 74 (320)  
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 (287) (23) (654) 447  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]          
Derivative [Line Items]          
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (3,755) $ (2,431) $ (7,506) $ 4,514  
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
one-month LIBOR [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]          
Derivative [Line Items]          
Fixed interest rate         1.03%