CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 373,087	$ (350,267)	$ 369,134	$ (479,588)
Postretirement benefits:
Amortization of prior service costs	73	92	219	277
Income tax expense	(17)	(22)	(32)	(66)
Total comprehensive income (loss)	$ 373,143	$ (350,197)	$ 369,321	$ (479,377)