Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Condensed Consolidated Statements of Comprehensive Income
Net Income (Loss)	$ 55,953	$ 198,108
Pension, postretirement and other post-employment benefits
Comprehensive loss before tax	(2,006)	(2,895)
Provision for income taxes	427	636
Other comprehensive loss, pension, postretirement and other post-employment benefits, net of tax	(1,579)	(2,259)
Available-for-sale securities
Comprehensive loss before tax	(4)	(15)
Provision for income taxes	1	3
Other comprehensive (loss) income, available-for-sale securities, net of tax	(3)	(12)
Total other comprehensive loss	(1,582)	(2,271)
Total comprehensive income	$ 54,371	$ 195,837