Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Income Statement Elements [Abstract]
Net (loss) earnings	$ (69,742)	$ 209,829	$ 54,169
Other comprehensive income, net of tax:
Foreign currency translation adjustments and other	15,634	(1,772)	(7,525)
Pension plan adjustments, net of tax expense (benefit) of $1,315, $2,619, and $(3,701), respectively	4,438	8,871	(11,559)
Other comprehensive income (loss)	20,072	7,099	(19,084)
Total comprehensive (loss) income	(49,670)	216,928	35,085
Pension plan adjustments, net of tax expense (benefit)	$ 1,315	$ 2,619	$ (3,701)