CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 49,430	$ 373,087	$ 561,108	$ 369,134
Postretirement benefits:
Amortization of prior service costs/actuarial gain	12	73	36	219
Income tax benefit	(2)	(17)	(8)	(32)
Total comprehensive income	$ 49,440	$ 373,143	$ 561,136	$ 369,321