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Foreign Currency Derivative Instruments Foreign Currency Derivative Instruments (Datails 2) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Foreign Currency [Abstract]    
Derivative Asset, Fair Value, Gross Asset $ 230 $ 472
Derivative Liability, Fair Value, Gross Asset (164) (90)
Derivative Asset $ 66 $ 382