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Income Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets |  |
Net operating loss carryforwards | $ 119,900 | $ 116,374
Percentage depletion carryover | 1,467 | 1,624
Compensation | 13,690 | 10,574
Lease liabilities | 17,107 | 0
Other | 9,099 | 7,207
Total deferred tax assets | 161,263 | 135,779
Valuation allowance on deferred tax assets | (6,736) | (6,519)
Total deferred tax assets, net of valuation allowance | 154,527 | 129,260
Deferred tax liabilities |  |
Unrealized gain on derivatives | 0 | 12,326
Property and equipment | (151,504) | (100,634)
Less than wholly-owned subsidiaries | (20,604) | (6,808)
Lease right of use assets | (17,107) | 0
Other | (2,641) | (2,256)
Total deferred tax liabilities | (191,856) | (122,024)
Net deferred tax (liabilities) assets | $ (37,329) | $ 7,236

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