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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Taxes        
Income tax provision (benefit) at statutory rate $ 6,273 $ (10,105) $ 5,083 $ (15,794)
Percentage depletion and other perm items (4,038) (11,768) (2,956) (5,600)
State taxes, net of effect of federal taxes 1,180 (1,584) 888 (1,502)
Change in valuation allowance (3,242) 19,531 (2,830) 20,381
Current expense associated with uncertain tax positions 1,848 5,132 2,209 3,101
AMT sequestration refund       (1,171)
Other, net (15)   (11)  
Provision for (benefit from) income taxes $ 2,006 $ 1,206 $ 2,383 $ (585)