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Derivatives (Details 1)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
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     8,487 (137)  
Foreign Exchange Contract [Member]          
Derivative [Line Items]          
Other     8,695    
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 189 (502) 301 (529)  
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 63 (213) (169) (142)  
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 126 (289) 470 (387)  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]          
Derivative [Line Items]          
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (1,671) $ (241) $ 6,945 $ (988)  
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%