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Income Taxes
 6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The Company calculates its interim income tax provision by estimating the annual expected effective tax rate and applying that rate to its ordinary year-to-date earnings or loss. In addition, the effect of changes in enacted tax laws, rates or tax status is recognized in the interim period in which the change occurs.
For the three months ended June 30, 2021 and 2020, the effective tax rate was approximately (6.0)% and 42.8%, respectively, based on the annual effective tax rate net of discrete federal and state taxes. For the six months ended June 30, 2021 and 2020, the effective tax rate was approximately 16.0% and 44.4%, respectively, based on the annual effective tax rate net of discrete federal and state taxes. For the three and six months ended June 30, 2021 and 2020, the statutory tax rate was 21.0%. The computation of the effective tax rate includes modifications from the statutory rate such as income tax credits, tax depletion deduction, carrybacks, and state apportionment changes, among other items.
The Company has recorded a liability of $2,684 for uncertain tax positions included in deferred tax liabilities, long-term, net on its balance sheet as of June 30, 2021, related to its depletion deduction methodology, and a corresponding increase to the income tax expense on its condensed consolidated income statements for the three and six months ended June 30, 2021. The Company’s federal income tax returns subsequent to 2017 remain open to audit by taxing authorities. The Company has not been informed that its tax return are the subject of any audit or investigation by taxing authorities.