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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Taxes        
Income tax provision at statutory rate $ 85,692 $ 6,273 $ 142,881 $ 5,083
Percentage depletion and other permanent items (15,923) (4,038) (26,108) (2,956)
State taxes, net of effect of federal taxes 1,870 1,180 3,086 888
Change in valuation allowance (71,513) (3,242) (119,646) (2,830)
Current expense associated with uncertain tax positions 376 1,848 752 2,209
Other, net (6) (15) (14) (11)
Provision for income taxes $ 496 $ 2,006 $ 951 $ 2,383