Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Condensed Consolidated Statements of Comprehensive Income (Loss)
Net Income (Loss)	$ (6,221)	$ 73,691	$ 64,565	$ 349,152
Pension, postretirement and other post-employment benefits
Comprehensive loss before tax	(2,006)	(9,770)	(6,018)	(15,560)
Provision for income taxes	427	2,147	1,281	3,419
Other comprehensive loss, pension, postretirement and other post-employment benefits, net of tax	(1,579)	(7,623)	(4,737)	(12,141)
Available-for-sale securities
Comprehensive income before tax	192	54	201	15
Provision for income taxes	(41)	(12)	(43)	(4)
Other comprehensive (loss) income, available-for-sale securities, net of tax	151	42	158	11
Total other comprehensive loss	(1,428)	(7,581)	(4,579)	(12,130)
Total comprehensive income (loss)	$ (7,649)	$ 66,110	$ 59,986	$ 337,022