Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 547,229	$ 450,555
Ending Balance	174,099	547,229
Cumulative Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(23,799)	(36,332)
Other comprehensive income (loss) before reclassifications	7,113	12,533
Net other comprehensive income (loss)	7,113	12,533
Ending Balance	(16,686)	(23,799)
Unrecognized Net Actuarial Loss and Prior Service Credit, Net
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(11,900)	(11,643)
Other comprehensive income (loss) before reclassifications	(27)	(10)
Amounts reclassified from AOCI, net of tax	(2,028)	(247)
Net other comprehensive income (loss)	(2,055)	(257)
Ending Balance	(13,955)	(11,900)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(35,699)	(47,975)
Other comprehensive income (loss) before reclassifications	7,086	12,523
Amounts reclassified from AOCI, net of tax	(2,028)	(247)
Net other comprehensive income (loss)	5,058	12,276
Ending Balance	$ (30,641)	$ (35,699)