Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Income Tax Expense at Federal Rate (Details)

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Income Taxes - Summary of Income Tax Expense at Federal Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Computed tax expense at the statutory rate of 21% $ 46,129 $ 84,473 $ 54,968
Reduction in income taxes resulting from:      
Statutory depletion (4,577) (5,163) (4,185)
State taxes 1,234 1,657 1,243
Executive compensation 789 1,302 0
Prior year tax adjustments 7 755 0
Other, net 31 503 (12)
Total income tax expense $ 43,613 $ 83,527 $ 52,014