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v3.20.4

Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforward | $ 879,339 | $ 581,324
Divestiture contract obligation | 132,352 | 0
Deferred compensation | 16,635 | 16,815
Equity compensation | 5,445 | 7,188
Asset retirement obligation | 18,923 | 60,064
Interest expense carryover | 15,757 | 18,035
Lease deferred tax assets | 16,070 | 16,450
Cumulative mark-to-market loss | 2,607 | 0
Other | 12,082 | 11,072
Valuation allowances: |  |
Total deferred tax assets | 720,191 | 520,122
Deferred tax liabilities: |  |
Depreciation and depletion | (839,869) | (639,581)
Cumulative mark-to-market gain | 0 | (25,957)
Lease deferred tax liabilities | (15,058) | (14,780)
Other | (531) | 0
Total deferred tax liabilities | (855,458) | (680,318)
Net deferred tax liability | (135,267) | (160,196)
Federal |  |
Valuation allowances: |  |
Valuation allowances | (152,499) | (32,530)
State, net of federal benefit |  |
Valuation allowances: |  |
Valuation allowances | $ (226,520) | $ (158,296)

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