Income Taxes	3 Months Ended
Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three months ended March 31, 2020, the Company recorded income tax benefit of $2,188 on a loss from continuing operations before income taxes of $41,996. The income tax benefit differs from the expected statutory amount primarily due to the increase in the valuation allowance, partially offset by the permanent impact of percentage depletion deductions, the impact of state income taxes, net of federal tax impact, and the recording of a discrete tax benefit related to the refundability of previously sequestered AMT Credits. The discrete income tax benefit of the previously sequestered AMT Credits is $2,123. As of March 31, 2020, the Company anticipates that no current federal income tax liability will be generated in 2020. For the three months ended March 31, 2019, the Company recorded income tax benefit of $4,778 on income from continuing operations before income taxes of $3,212. The income tax expense differs from the expected statutory amount primarily due to the permanent impact of percentage depletion and stock-based compensation deductions and the reduction in the valuation allowance. During the three months ended March 31, 2020, the Company recorded an increase of $13,187 to its deferred tax asset valuation allowance. The increase in the valuation allowance results from an increase in deferred tax assets for which the Company is unable to support realization. The Company currently is relying primarily on the reversal of taxable temporary differences, along with consideration of taxable income via carryback to prior years and tax planning strategies, to support the realization of deferred tax assets. For each reporting period, the Company updates its assessment regarding the realizability of its deferred tax assets, including scheduling the reversal of its deferred tax assets and liabilities, to determine the amount of valuation allowance needed. Scheduling the reversal of deferred tax asset and liability balances requires judgment and estimation. The Company believes the deferred tax liabilities relied upon as future taxable income in its assessment will reverse in the same period and jurisdiction and are of the same character as the temporary differences giving rise to the deferred tax assets that will be realized. The valuation allowance recorded represents the portion of deferred tax assets for which the Company is unable to support realization through the methods described above. On March 27, 2020, the “Coronavirus Aid, Relief, and Economic Security Act” (“CARES Act”) was enacted into law. As a result of the CARES Act, the Company expects that the existing AMT Credits of $67,862 will be fully refunded during the year ended December 31, 2020. As of March 31, 2020 and December 31, 2019, the Company classified the current portion of AMT Credit refunds of $67,862 and $33,065, respectively, within the “Prepaid expenses and other current assets” line of the Condensed Consolidated Balance Sheets.

Income Taxes

For the three months ended March 31, 2020, the Company recorded income tax benefit of $2,188 on a loss from continuing operations before income taxes of $41,996. The income tax benefit differs from the expected statutory amount primarily due to the increase in the valuation allowance, partially offset by the permanent impact of percentage depletion deductions, the impact of state income taxes, net of federal tax impact, and the recording of a discrete tax benefit related to the refundability of previously sequestered AMT Credits. The discrete income tax benefit of the previously sequestered AMT Credits is $2,123. As of March 31, 2020, the Company anticipates that no current federal income tax liability will be generated in 2020. For the three months ended March 31, 2019, the Company recorded income tax benefit of $4,778 on income from continuing operations before income taxes of $3,212. The income tax expense differs from the expected statutory amount primarily due to the permanent impact of percentage depletion and stock-based compensation deductions and the reduction in the valuation allowance.

During the three months ended March 31, 2020, the Company recorded an increase of $13,187 to its deferred tax asset valuation allowance. The increase in the valuation allowance results from an increase in deferred tax assets for which the Company is unable to support realization. The Company currently is relying primarily on the reversal of taxable temporary differences, along with consideration of taxable income via carryback to prior years and tax planning strategies, to support the realization of deferred tax assets. For each reporting period, the Company updates its assessment regarding the realizability of its deferred tax assets, including scheduling the reversal of its deferred tax assets and liabilities, to determine the amount of valuation allowance needed. Scheduling the reversal of deferred tax asset and liability balances requires judgment and estimation. The Company believes the deferred tax liabilities relied upon as future taxable income in its assessment will reverse in the same period and jurisdiction and are of the same character as the temporary differences giving rise to the deferred tax assets that will be realized. The valuation allowance recorded represents the portion of deferred tax assets for which the Company is unable to support realization through the methods described above.

On March 27, 2020, the “Coronavirus Aid, Relief, and Economic Security Act” (“CARES Act”) was enacted into law. As a result of the CARES Act, the Company expects that the existing AMT Credits of $67,862 will be fully refunded during the year ended December 31, 2020. As of March 31, 2020 and December 31, 2019, the Company classified the current portion of AMT Credit refunds of $67,862 and $33,065, respectively, within the “Prepaid expenses and other current assets” line of the Condensed Consolidated Balance Sheets.