Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Other Comprehensive Income [Abstract]
Net income (loss)	$ 1,448,545	$ 288,790	$ (446,899)
Employee benefit plans:
Current period actuarial gain (loss)	56,485	47,461	(60,647)
Income tax	(12,888)	0	0
Current period actuarial (loss) gain, net of income tax	43,597	47,461	(60,647)
Less: reclassification adjustments for amounts reclassified to earnings due to amortization of net actuarial loss and settlements	3,555	6,021	7,278
Income tax	(811)	0	0
Less: reclamation adjustments for amounts reclassified to earnings due to amortization of net actuarial (gain) loss and settlements, net of income tax	2,744	6,021	7,278
Total other comprehensive income (loss), net of tax	46,341	53,482	(53,369)
Total comprehensive income (loss)	$ 1,494,886	$ 342,272	$ (500,268)