CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (456,808)	$ 27,151
Postretirement benefits:
Amortization of prior service costs	73	92
Income tax expense	2	(22)
Total comprehensive (loss) income	$ (456,733)	$ 27,221