CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 30,231	$ 452,855	$ 511,678	$ (3,953)
Postretirement benefits:
Amortization of prior service costs/actuarial gain	12	73	24	146
Income tax benefit	(3)	(17)	(6)	(15)
Total comprehensive income (loss)	$ 30,240	$ 452,911	$ 511,696	$ (3,822)