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Derivative Instruments and Hedging Activities Additional Information (Details) (Foreign Exchange Contract [Member], Cash Flow Hedging [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net $ 566 $ 1,107