Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 407,563	$ 27,866	$ 679,435	$ 21,824
Derivative instruments
Comprehensive income before tax		637	1,763	1,327
Other comprehensive income, derivative instruments, net of tax		637	1,763	1,327
Pension, postretirement and other post-employment benefits
Comprehensive income (loss) before tax	(8,901)	3,963	(9,423)	4,510
Other comprehensive income (loss), pension, postretirement and other post-employment benefits, net of tax	(8,901)	3,963	(9,423)	4,510
Available-for-sale securities
Comprehensive income (loss) before tax		(16)	182	84
Other comprehensive income, available-for-sale securities, net of tax		(16)	182	84
Total other comprehensive income (loss)	(8,901)	4,584	(7,478)	5,921
Total comprehensive income	$ 398,662	$ 32,450	$ 671,957	$ 27,745