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Derivative Instruments and Hedging Activities (Details Textuals) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Mar. 31, 2006
Derivative Instruments and Hedging Activities (Textuals)            
Fair value of investment hedge contracts $ (3,070)   $ (3,070)   $ 313  
(Loss) gain on investment hedge derivative (3,750) 684 1,745 (3,421)    
Fair value of non-designated foreign exchange forward contracts 8,041   8,041   705  
Maximum maturities of Foreign exchange forward contracts     24 months      
Fair value of interest rate contracts (1,478)   (1,478)   (2,351)  
Notional amount of pay-fixed receive-variable interest rate swap           200,000
Gain recognized on designated cash flow hedges 350 101 841 935    
Anticipated reclassification from other comprehensive income to interest expense within the next 12 months 930   930      
Interest rate swaps
           
Derivative Instruments and Hedging Activities (Textuals)            
Notional amount of pay-fixed receive-variable interest rate swap $ 50,000   $ 50,000