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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 22,402 | $ 40,846
Accruals | 10,728 | 11,731
Asset retirement obligations | 48,994 | 44,437
Derivative instruments | 2,280 | 12,776
Tax credits | 88,908 | 61,044
Other | 2,882 | 3,551
Subtotal | 176,194 | 174,385
Valuation allowance | 0 | (77,546)
Total deferred tax assets | 176,194 | 96,839
Deferred tax liabilities: |  |
Book tax differences in property basis | (133,350) | (98,670)
Total deferred tax liabilities | (133,350) | (98,670)
Net deferred tax asset | $ 42,844 |
Net deferred tax liability |  | $ (1,831)

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