Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (14,066)	$ (25,039)
Change in other postretirement benefit plans, net of tax	(681)	373
Foreign currency translation adjustment	(5,699)	1,508
Comprehensive loss	$ (20,446)	$ (23,158)