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Derivative Instruments Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments [Abstract]        
Foreign Currency Contract, Asset, Fair Value Disclosure $ 262   $ 262  
Accumulated Unrealized Gain (Loss) on Cash Flow Hedging Instruments 177 $ 503 177 $ 503
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 13 $ 17 $ 39 $ 26