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Income Taxes
 6 Months Ended
Jun. 30, 2022
Income Tax Disclosure [Abstract]  
Income Taxes Income TaxesFor the three and six months ended June 30, 2022, the Company estimated its annual effective tax rate and applied this effective tax rate to its year-to-date pretax income at the end of the interim reporting period. The tax effect of unusual or infrequently occurring items, including the effects of changes in tax laws or rates and changes in judgment about the realizability of deferred tax assets, are reported in the interim period in which they occur. For the three and six months ended June 30, 2022, the Company had income tax expense of $68.4 million and $101.8 million, respectively. For the three and six months ended June 30, 2021, the Company utilized a discrete period method to calculate taxes, as it did not believe that the annual effective tax rate method represented a reliable estimate given the uncertainty at the time surrounding the COVID-19 pandemic, the Chinese ban on Australian coal and other potentially disruptive factors and its impact on the Company's annual guidance. For the three and six months ended June 30, 2021, the Company had an income tax benefit of $6.6 million and an income tax expense of $17.0 million, respectively. The income tax benefit of $6.6 million was primarily due to a pre-tax operating loss combined with the Internal Revenue Code ("IRC") Section 45I Marginal Well Credit ("Section 45I Credit"). The Section 45I Credit is a production-based tax credit that provides a credit for qualified natural gas production. The $17.0 million of income tax expense for the six months ended June 30, 2021 was primarily due to the establishment of a non-cash $47.8 million state deferred income tax asset valuation allowance offset partially by a net non-cash income tax benefit of $22.9 million due to the remeasurement of state deferred income tax assets and liabilities and $7.9 million of net income tax benefit from the Section 45I Credit, depletion and other adjustments.