Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (11,809)	$ (6,814)
Changes in defined benefit pension plans, net of tax of $286 and $155	902	460
Other	6	0
Total comprehensive loss	$ (10,901)	$ (6,354)