Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net income (loss)	$ (3,500)	$ (700)	$ (18,500)	$ 8,300
Net pension adjustments, net of tax:
Reclassification of adjustment for defined benefit plans recorded in net loss			20,600	100
Total net pension adjustments			20,600	100
Total other comprehensive income, net of tax			20,600	100
Comprehensive income (loss)	$ (3,500)	$ (700)	$ 2,100	$ 8,400