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, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Computed tax expense at the statutory rate $ 84,473 $ 54,968 $ 50,771
Reduction in income taxes resulting from:      
Statutory depletion (5,163) (4,185) (3,378)
State taxes 1,657 1,243 530
Executive compensation 1,302 0 0
Prior year tax adjustments 755 0 0
Effect of change in statutory tax rate 0 0 (103)
Other, net 503 (12) 10
Income Taxes $ 83,527 $ 52,014 $ 47,830