Annual report pursuant to Section 13 and 15(d)

Income Taxes (Reconciliation) (Details)

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Income Taxes (Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income before income taxes $ 103,229 $ 308,470 $ 121,697
Income tax expense computed at the statutory federal income tax rate 21,678 64,779 42,594
State income tax expense, net of federal benefit 1,253 3,568 1,273
Equity based compensation 1,222 (494) 0
Non-deductible compensation 90 1,209 0
Non-deductible merger expenses 5,537 0 0
Statutory depletion carryforward 5,381 0 0
Other 140 168 0
Change in valuation allowance 0 (61,120) (42,594)
Income tax expense $ 35,301 $ 8,110 $ 1,273