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Derivative Instruments Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Derivative Instruments [Abstract]          
Foreign Currency Contract, Asset, Fair Value Disclosure $ 160   $ 160   $ 160
Accumulated Unrealized Gain (Loss) on Cash Flow Hedging Instruments 123 $ 1,307 123 $ 1,307  
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 68 $ 671 $ 0 $ 1