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Derivative Instruments Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivative Instruments [Abstract]    
Foreign Currency Contract, Asset, Fair Value Disclosure $ 201  
Accumulated Unrealized Gain (Loss) on Cash Flow Hedging Instruments 107 $ 51
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 3 $ 6