CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 104,004	$ 134,287
Other comprehensive income, before tax:
Foreign currency translation adjustments	0	142
Pension and other post retirement benefit items
Recognition of previously deferred post-retirement benefit plan costs	1,450	975
Realized gain on available-for-sale investment during the period	0	(20,800)
Other comprehensive income (loss), before tax	1,450	(19,683)
Income tax effect related to components of other comprehensive income	(372)	5,065
Other comprehensive income (loss), net of tax	1,078	(14,618)
Comprehensive income	105,082	119,669
Comprehensive loss (income) attributable to redeemable noncontrolling interest	299	(53)
Total comprehensive income	$ 105,381	$ 119,616