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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Summary of net deferred tax position | The Company’s net deferred tax position as of December 31, 2019 and 2018 is as follows (in thousands).
|  | December 31,
|  | 2019 |  | 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 |  |  | — |
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 |  | — |  |  | (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 | ) |  | — |
Other |  | (2,641 | ) |  | (2,256 | )
Total deferred tax liabilities |  | (191,856 | ) |  | (122,024 | )
Net deferred tax (liabilities) assets |  | $ | (37,329 | ) |  | $ | 7,236 |
Income tax expense reconciled to the tax computed at the statutory federal rate | The current income tax provision and the deferred income tax provision for the years ended December 31, 2019, 2018 and 2017 were comprised of the following (in thousands).
|  | Year Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Current income tax (benefit) provision |  |  |  |  |  |
Federal income tax |  | $ | — |  |  | $ | (455 | ) |  | $ | (8,178 | )
State income tax |  | — |  |  | — |  |  | 21 |
Net current income tax benefit |  | $ | — |  |  | $ | (455 | ) |  | $ | (8,157 | )
Deferred income tax provision (benefit) |  |  |  |  |  |
Federal income tax |  | $ | 29,171 |  |  | $ | (20,457 | ) |  | $ | — |
State income tax |  | 6,361 |  |  | 13,221 |  |  | — |
Net deferred income tax provision (benefit) |  | $ | 35,532 |  |  | $ | (7,236 | ) |  | $ | — |
Reconciliations of the tax expense (benefit) computed at the statutory federal rate to the Company’s total income tax provision (benefit) for the years ended December 31, 2019, 2018 and 2017 is as follows (in thousands).
|  | Year Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Federal tax expense at statutory rate(1) |  | $ | 33,441 |  |  | $ | 61,543 |  |  | $ | 45,447 |
State income tax |  | 6,141 |  |  | 16,181 |  |  | 368 |
Permanent differences |  | (4,267 | ) |  | (2,488 | ) |  | (4,740 | )
AMT credit refundable |  | — |  |  | 455 |  |  | 8,178 |
Tax Cuts and Jobs Act rate change |  | — |  |  | — |  |  | 51,525 |
Change in federal valuation allowance |  | — |  |  | (80,003 | ) |  | (101,917 | )
Change in state valuation allowance |  | 217 |  |  | (2,924 | ) |  | 1,139 |
Net deferred income tax provision (benefit) |  | 35,532 |  |  | (7,236 | ) |  | — |
Net current income tax benefit |  | — |  |  | (455 | ) |  | (8,157 | )
Total income tax provision (benefit) |  | $ | 35,532 |  |  | $ | (7,691 | ) |  | $ | (8,157 | )
__________________ (1) The statutory federal tax rate was 21% for the years ended December 31, 2019 and 2018 and 35% for the year ended December 31, 2017.

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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