Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period	$ 24,914
Other comprehensive income (loss)	712	$ (328)
Balance at end of period	67,656
Foreign currency translation adjustment
Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period	(5,183)	(5,479)
Other comprehensive income before reclassifications	(471)	(328)
Amounts reclassified from accumulated other comprehensive income	1,183	0
Other comprehensive income (loss)	712	(328)
Balance at end of period	$ (4,471)	$ (5,807)