Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 547,229	$ 450,555
Ending Balance	420,448	434,331
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	(28,158)	4,780
Net other comprehensive income (loss)	(28,158)	4,780
Ending Balance	(51,957)	(31,552)
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)
Amounts reclassified from AOCI, net of tax	314	85
Net other comprehensive income (loss)	314	85
Ending Balance	(11,586)	(11,558)
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	(28,158)	4,780
Amounts reclassified from AOCI, net of tax	314	85
Net other comprehensive income (loss)	(27,844)	4,865
Ending Balance	$ (63,543)	$ (43,110)