Accumulated Other Comprehensive Loss (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive loss at December 31, 2017	$ 30,806
Net current-period other comprehensive income	1,825
Accumulated other comprehensive loss at March 31, 2018	61,519
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive loss at December 31, 2017	(18,879)
Net current-period other comprehensive income	1,825
Accumulated other comprehensive loss at March 31, 2018	(17,054)
AOCI attributable to parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive loss at December 31, 2017	(18,879)
Accumulated other comprehensive loss at March 31, 2018	$ (17,054)