Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 665,781
Net current-period other comprehensive income (loss), before income taxes	32,647	$ (7,881)	$ (42,442)
Income tax benefit	114	364	45
Net current-period other comprehensive income (loss), net of income taxes	32,761	(7,517)	(42,397)
Ending balance	616,805	665,781
Currency Translation Adjustment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(166,203)	(159,920)
Net current-period other comprehensive income (loss), before income taxes	33,084	(6,272)
Income tax benefit	11	(11)
Net current-period other comprehensive income (loss), net of income taxes	33,095	(6,283)
Ending balance	(133,108)	(166,203)	(159,920)
Gain (Losses) on Cash Flow Hedges [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,508)	(274)
Net current-period other comprehensive income (loss), before income taxes	(437)	(1,609)
Income tax benefit	103	375
Net current-period other comprehensive income (loss), net of income taxes	(334)	(1,234)
Ending balance	(1,842)	(1,508)	(274)
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(167,711)	(160,194)
Ending balance	$ (134,950)	$ (167,711)	$ (160,194)