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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Allocation of Income Tax Expense | Total income taxes were as follows:
| Years Ended December 31,
(in thousands) | 2018 |  | 2017 |  | 2016
Income tax (benefit) expense | $ | 15,517 |  |  | $ | (53,133 | ) |  | $ | 2,840 |
Other comprehensive income for changes in cash flow hedge | 16 |  |  | 522 |  |  | 4,162 |
| $ | 15,533 |  |  | $ | (52,611 | ) |  | $ | 7,002 |
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) | 2018 |  | 2017 |  | 2016
Current expense |  |  |  |  |
Federal taxes | $ | 2,875 |  |  | $ | 1,552 |  |  | $ | 44,779 |
State taxes | 6,434 |  |  | (630 | ) |  | 10,936 |
Total current provision | 9,309 |  |  | 922 |  |  | 55,715 |
Deferred expense (benefit) |  |  |  |  |
Federal taxes | 6,708 |  |  | (52,886 | ) |  | (47,056 | )
State taxes | (500 | ) |  | (1,169 | ) |  | (5,819 | )
Total deferred provision | 6,208 |  |  | (54,055 | ) |  | (52,875 | )
Income tax expense (benefit) | $ | 15,517 |  |  | $ | (53,133 | ) |  | $ | 2,840 |
Effective tax rate | 25.0 | % |  | (400.8 | )% |  | 146.0 | %
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) | 2018 |  | 2017 |  | 2016
Computed "expected" tax expense | $ | 13,044 |  |  | $ | 4,640 |  |  | $ | 681 |
State income taxes, net of federal tax effect | 4,748 |  |  | (1,129 | ) |  | 6 |
Changes in state DTL for mergers | — |  |  | — |  |  | 3,320 |
Excess share based compensation | (1,254 | ) |  | (3,314 | ) |  | (1,709 | )
Nondeductible merger expenses | — |  |  | — |  |  | 801 |
Revaluation of U.S. deferred income taxes | (760 | ) |  | (53,449 | ) |  | — |
Other, net | (261 | ) |  | 119 |  |  | (259 | )
Income tax expense (benefit) | $ | 15,517 |  |  | $ | (53,133 | ) |  | $ | 2,840 |
Deferred Tax Assets and Liabilities | Net deferred tax assets and liabilities consist of the following temporary differences:
(in thousands) | December 31, 2018 |  | December 31, 2017
Deferred tax assets: |  |  |
Deferred revenue | $ | — |  |  | $ | 3,907 |
Net operating loss carry-forwards | 12,612 |  |  | 14,983 |
Accruals and reserves | 6,545 |  |  | 5,189 |
Pension benefits | 2,873 |  |  | 3,556 |
Asset retirement obligations | 7,797 |  |  | 4,608 |
Total gross deferred tax assets | 29,827 |  |  | 32,243 |
Less valuation allowance | (862 | ) |  | (862 | )
Net deferred tax assets | 28,965 |  |  | 31,381 |
Deferred tax liabilities: |  |  |
Deferred revenue | 19,554 |  |  | — |
Plant-in-service | 99,666 |  |  | 89,494 |
Intangible assets | 32,963 |  |  | 37,682 |
Interest rate swaps | 3,339 |  |  | 3,511 |
Other, net | 896 |  |  | 1,573 |
Total gross deferred tax liabilities | 156,418 |  |  | 132,260 |
Net deferred tax liabilities | $ | 127,453 |  |  | $ | 100,879 |

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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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- 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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