Hedging - Changes to Comprehensive Income (Loss) Associated with the Company's Hedging Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Beginning balance of unrealized loss on forward exchange contracts	$ (819)	$ (752)	$ (875)
Other comprehensive loss before reclassifications	589	694	504
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	881	627	627
Other comprehensive income (loss)	292	(67)	123
Ending balance of unrealized loss on forward exchange contracts	$ (527)	$ (819)	$ (752)