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Derivative Instruments Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Derivative Instruments [Abstract]      
Foreign Currency Contract, Asset, Fair Value Disclosure $ 12   $ 191
Accumulated Unrealized Gain (Loss) on Cash Flow Hedging Instruments 51 $ 106  
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 6 $ 362