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Derivative Instruments Derivative Instruments (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Derivative Instruments [Abstract]    
Foreign Currency Contract, Asset, Fair Value Disclosure $ 166,000 $ 166,000
Accumulated Unrealized Gain (Loss) on Cash Flow Hedging Instruments 0 0
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 0 $ 613,000