CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 452,855	$ (156,472)	$ (3,953)	$ (129,321)
Postretirement benefits:
Amortization of prior service costs	73	92	146	184
Income tax expense	(17)	(22)	(15)	(44)
Total comprehensive income (loss)	$ 452,911	$ (156,402)	$ (3,822)	$ (129,181)