Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Condensed Consolidated Statements of Comprehensive Income
Net Income (Loss)	$ 14,833	$ 77,353	$ 70,786	$ 275,461
Pension, postretirement and other post-employment benefits
Comprehensive loss before tax	(2,006)	(2,895)	(4,012)	(5,790)
Provision for income taxes	427	636	854	1,272
Other comprehensive loss, pension, postretirement and other post-employment benefits, net of tax	(1,579)	(2,259)	(3,158)	(4,518)
Available-for-sale securities
Comprehensive income (loss) before tax	13	(24)	9	(39)
Provision for income taxes	(3)	5	(2)	8
Other comprehensive (loss) income, available-for-sale securities, net of tax	10	(19)	7	(31)
Total other comprehensive loss	(1,569)	(2,278)	(3,151)	(4,549)
Total comprehensive income	$ 13,264	$ 75,075	$ 67,635	$ 270,912