Accumulated Other Comprehensive Loss (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive loss at December 31, 2016	$ 53,398
Net current-period other comprehensive income	2,749
Accumulated other comprehensive loss at September 30, 2017	30,063
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive loss at December 31, 2016	(21,748)
Net current-period other comprehensive income	2,749
Accumulated other comprehensive loss at September 30, 2017	(18,999)
AOCI attributable to parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive loss at December 31, 2016	(21,748)
Accumulated other comprehensive loss at September 30, 2017	$ (18,999)