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Foreign Currency Derivative Instruments Foreign Currency Derivative Instruments (Datails 2) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Foreign Currency [Abstract]    
Derivative Liability, Fair Value, Gross Liability $ (373)  
Derivative Asset, Fair Value, Gross Asset   472
Derivative Liability, Fair Value, Gross Asset 74 (90)
Derivative Liability (299)  
Derivative Asset   $ 382