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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 14,542 | $ 14,310
Accruals | 12,218 | 2,993
Asset retirement obligations | 41,382 | 26,383
Tax credits and federal return to provision | 47,803 | 0
Interest limitation carryforward | 13,892 | 7,486
Other | 5,154 | 2,033
Total deferred tax assets | 134,991 | 53,205
Deferred tax liabilities: |  |
Book tax differences in property basis | (143,896) | (95,348)
Derivative instruments | (152) | (3,692)
Total deferred tax liabilities | (144,048) | (99,040)
Net deferred tax asset (liability) | $ (9,057) | $ (45,835)

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