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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Components of Federal and State Income Taxes | The provision for the federal and state income taxes attributable to income (loss) consists of the following components:
| Years Ended December 31,
(in thousands) | 2019 |  | 2018 |  | 2017
Current (benefit) expense |  |  |  |  |
Federal taxes | $ | (1,205 | ) |  | $ | 2,875 |  |  | $ | 1,552 |
State taxes | 5,665 |  |  | 6,434 |  |  | (630 | )
Total current provision | 4,460 |  |  | 9,309 |  |  | 922 |
Deferred expense (benefit) |  |  |  |  |
Federal taxes | 12,183 |  |  | 6,708 |  |  | (52,886 | )
State taxes | (539 | ) |  | (500 | ) |  | (1,169 | )
Total deferred provision | 11,644 |  |  | 6,208 |  |  | (54,055 | )
Income tax expense (benefit) | $ | 16,104 |  |  | $ | 15,517 |  |  | $ | (53,133 | )
Effective tax rate | 22.7 | % |  | 25.0 | % |  |
Reconciliation of Income Taxes | A reconciliation of income taxes determined by applying the federal and state tax rates to income (loss) is as follows:
| Years Ended December 31,
(in thousands) | 2019 |  | 2018 |  | 2017
Expected tax expense at federal statutory | $ | 14,918 |  |  | $ | 13,044 |  |  | $ | 4,640 |
State income taxes, net of federal tax effect | 4,709 |  |  | 4,748 |  |  | (1,129 | )
Revaluation of U.S. deferred income taxes | — |  |  | (760 | ) |  | (53,449 | )
Excess tax benefit from share based compensation and other, net | (3,523 | ) |  | (1,515 | ) |  | (3,195 | )
Income tax expense (benefit) | $ | 16,104 |  |  | $ | 15,517 |  |  | $ | (53,133 | )
Deferred Tax Assets and Liabilities | Deferred tax assets and liabilities are measured using enacted tax rates that are expected to apply in the year of reversal or settlement and arise from temporary differences between the US GAAP and tax bases of the following assets and liabilities:
(in thousands) | December 31, 2019 |  | December 31, 2018
Deferred tax assets: |  |  |
Leases | $ | 106,564 |  |  | $ | — |
Asset retirement obligations | 9,957 |  |  | 7,797 |
Net operating loss carry-forwards | 10,071 |  |  | 12,612 |
Pension liabilities | 3,161 |  |  | 2,873 |
Accruals and stock based compensation | 1,935 |  |  | 6,545 |
Other | 1,408 |  |  | — |
Total gross deferred tax assets | 133,096 |  |  | 29,827 |
Less valuation allowance | — |  |  | (862 | )
Net deferred tax assets | 133,096 |  |  | 28,965 |
Deferred tax liabilities: |  |  |
Property, plant and equipment | 110,297 |  |  | 99,902 |
Leases | 105,475 |  |  | — |
Intangible assets | 27,201 |  |  | 32,727 |
Prepaid assets and other | 26,574 |  |  | 23,789 |
Total gross deferred tax liabilities | 269,547 |  |  | 156,418 |
Net deferred tax liabilities | $ | 136,451 |  |  | $ | 127,453 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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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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