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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Taxes        
Income tax provision (benefit) at statutory rate $ 18,493 $ (40,128) $ 23,576 $ (55,922)
Percentage depletion and other perm items (3,357) 2,242 (6,313) (3,358)
State taxes, net of effect of federal taxes 944 (2,695) 1,832 (4,197)
Change in valuation allowance (15,984) 40,734 (18,814) 61,115
Current expense associated with uncertain tax positions (1,128) 226 1,081 3,327
AMT sequestration refund       (1,171)
Other, net (50)   (61)  
Provision for (benefit from) income taxes $ (1,082) $ 379 $ 1,301 $ (206)