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Derivatives (Details 1)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
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  
Other     6,341 (185)  
Foreign Exchange Contract [Member]          
Derivative [Line Items]          
Other     6,761    
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 (174) 564 127 33  
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 (151) 312 (320) 169  
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 (23) 252 447 (136)  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]          
Derivative [Line Items]          
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (2,431) $ 141 $ 4,514 $ (847)  
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%