Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 59,575	$ (41,866)	$ 34,686
Other comprehensive earnings (loss):
Changes in fair market value of derivatives, net of tax	3,499	311	(1,307)
Changes in unrealized pension cost, net of tax	1,203	91,081	(2,965)
Cumulative translation adjustment, net of tax	(848)	4	77
Other comprehensive earnings (loss)	3,854	91,396	(4,195)
Comprehensive earnings	$ 63,429	$ 49,530	$ 30,491