Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Consolidated net income (loss)	$ 153,488	$ 50,918	$ 66,816
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(13,747)	6,457	(86)
Benefit plans	301	(1,840)	(12,928)
Total other comprehensive income (loss), net of tax	(13,446)	4,617	(13,014)
Comprehensive income (loss)	140,042	55,535	53,802
Less: Comprehensive income (loss) attributable to noncontrolling interest in subsidiaries, net of tax	27,653	6,301	18,538
Comprehensive income (loss) attributable to common stockholders	$ 112,389	$ 49,234	$ 35,264