Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Condensed Consolidated Statements of Comprehensive Income
Net Income (Loss)	$ 77,353	$ 407,563	$ 275,461	$ 679,435
Derivative instruments
Comprehensive income before tax				1,763
Other comprehensive income, derivative instruments, net of tax				1,763
Pension, postretirement and other post-employment benefits
Comprehensive loss before tax	(2,895)	(8,901)	(5,790)	(9,423)
Provision for income taxes	636		1,272
Other comprehensive loss, pension, postretirement and other post-employment benefits, net of tax	(2,259)	(8,901)	(4,518)	(9,423)
Available-for-sale securities
Comprehensive (loss) income before tax	(24)		(39)	182
Provision for income taxes	5		8
Other comprehensive (loss) income, available-for-sale securities, net of tax	(19)		(31)	182
Total other comprehensive loss	(2,278)	(8,901)	(4,549)	(7,478)
Total comprehensive income	$ 75,075	$ 398,662	$ 270,912	$ 671,957