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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Tax Credit Carryforward [Line Items] |  |  |  |  |
Income tax expense (benefit) | $ 5,433 | $ (8,152) | $ 22,439 | $ (9,336) |
Deferred income tax valuation allowance | 47,787 |  | 47,787 |  | $ 0
Income tax benefit from remeasurement of deferred income tax assets and liabilities |  |  | 22,900 |  |
Income tax benefit from Internal Revenue Code |  |  | 2,500 | 3,300 |
Income tax benefit from depletion expense |  |  |  | 3,200 |
Income tax benefit from loss recognized before income taxes |  |  |  | $ 2,900 |
State and Local Jurisdiction |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Deferred income tax valuation allowance | $ 47,800 |  | $ 47,800 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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