CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 11,798	$ (63,896)	$ 44,635	$ (51,031)
Other comprehensive earnings (loss):
Changes in fair market value of derivatives, net of tax	1,727	(292)	3,667	100
Changes in unrealized pension cost, net of tax	(1,835)	72,530	341	90,976
Cumulative translation adjustment, net of tax	(6,071)	(10)	(8,332)	2
Other comprehensive (loss) earnings	(6,179)	72,228	(4,324)	91,078
Comprehensive earnings	$ 5,619	$ 8,332	$ 40,311	$ 40,047