Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (22,043)	$ (366)	$ (33,852)	$ (7,180)
Changes in defined benefit pension plans, net of tax of $288, $155, $574, $310	899	461	1,801	921
Other	6	0	12	0
Total comprehensive income (loss)	$ (21,138)	$ 95	$ (32,039)	$ (6,259)