Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 209,829	$ 54,169	$ 49,826
Other comprehensive income, net of tax:
Foreign currency translation adjustments and other	(1,772)	(7,525)	27,891
Pension plan adjustments, net of tax expense (benefit) of $2,619, ($3,701), and $7,661, respectively	8,871	(11,559)	12,688
Other comprehensive income (loss)	7,099	(19,084)	40,579
Total comprehensive income	$ 216,928	$ 35,085	$ 90,405