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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Taxes    
Income tax provision at statutory rate $ (1,189) $ (5,689)
Percentage depletion allowance 1,660 6,168
State taxes, net of effect of federal taxes (292) 82
Change in valuation allowance 412 850
Current expense associated with uncertain tax positions 361 (2,031)
AMT sequestration refund   (1,171)
Other, net (574)  
Provision for (benefit from) income taxes $ 378 $ (1,791)