Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 198,108	$ 271,872
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)	(522)
Provision for income taxes	636
Other comprehensive loss, pension, postretirement and other post-employment benefits, net of tax	(2,259)	(522)
Available-for-sale securities
Comprehensive (loss) income before tax	(15)	182
Provision for income taxes	3
Other comprehensive (loss) income, available-for-sale securities, net of tax	(12)	182
Total other comprehensive (loss) income	(2,271)	1,423
Total comprehensive income	$ 195,837	$ 273,295