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Derivative Instruments Derivative Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative Instruments [Abstract]        
Foreign Currency Contract, Asset, Fair Value Disclosure $ 1,460   $ 1,460  
Accumulated Unrealized Gain (Loss) on Cash Flow Hedging Instruments 1,307 $ 142 1,307 $ 142
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 671 $ 40 1,396 $ 53
Derivative Instruments Not Designated as Hedging Instruments, Loss     $ 1,440