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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Schedule of components of provision for income taxes [Table Text Block] | The provision for income taxes consists of the following:
| For the Years Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Current portion of income tax expense (benefit) |  |  |  |  |
Federal | $ | — |  |  | $ | 5,698 |  |  | $ | 2,932 |
State | 1,662 |  |  | 3,398 |  |  | 1,539 |
Deferred portion of income tax expense (benefit) | 141,708 |  |  | (192,066 | ) |  | (448,643 | )
Total income tax expense (benefit) | $ | 143,370 |  |  | $ | (182,970 | ) |  | $ | (444,172 | )
Effective tax rate | 22.0 | % |  | 53.2 | % |  | 37.0 | %
Schedule of components of net deferred income tax liabilities [Table Text Block] | The components of the net deferred tax liabilities are as follows:
| As of December 31,
| 2018 |  | 2017
| (in thousands)
Deferred tax liabilities |  |  |
Oil and gas properties | $ | 218,094 |  |  | $ | 142,467 |
Derivative assets | 35,247 |  |  | — |
Other | 4,812 |  |  | 3,412 |
Total deferred tax liabilities | 258,153 |  |  | 145,879 |
Deferred tax assets |  |  |  |  |
Derivative liabilities | — |  |  | 29,463 |
Credit carryover | 22,554 |  |  | 22,537 |
Pension | 6,427 |  |  | 7,986 |
Federal and state tax net operating loss carryovers | 4,217 |  |  | 3,867 |
Stock compensation | 3,263 |  |  | 3,545 |
Other liabilities | 1,497 |  |  | 1,470 |
Total deferred tax assets | 37,958 |  |  | 68,868 |
Valuation allowance | (3,083 | ) |  | (2,978 | )
Net deferred tax assets | 34,875 |  |  | 65,890 |
Total net deferred tax liabilities | $ | 223,278 |  |  | $ | 79,989 |
Current federal income tax refundable | $ | 59 |  |  | $ | 37 |
Current state income tax payable | $ | 1,331 |  |  | $ | 3,009 |
Schedule of effective income tax rate reconciliation [Table Text Block] | Federal income tax expense (benefit) differs from the amount that would be provided by applying the statutory United States federal income tax rate to income before income taxes primarily due to the effect of state income taxes, excess tax benefits and deficiencies from share-based payment awards, changes in valuation allowances, R&D credits, and accumulated impacts of other smaller permanent differences, and is reported as follows:
| For the Years Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Federal statutory tax expense (benefit) | $ | 136,873 |  |  | $ | (120,335 | ) |  | $ | (420,671 | )
Increase (decrease) in tax resulting from: |  |  |  |  |
Federal tax reform changes - 2017 Tax Act | — |  |  | (63,675 | ) |  | — |
State tax expense (benefit) (net of federal benefit) | 2,771 |  |  | (3,286 | ) |  | (17,549 | )
Change in valuation allowance | 105 |  |  | (2,727 | ) |  | (5,059 | )
Employee share-based compensation | 2,508 |  |  | 8,190 |  |  | — |
Other | 1,113 |  |  | (1,137 | ) |  | (893 | )
Income tax expense (benefit) | $ | 143,370 |  |  | $ | (182,970 | ) |  | $ | (444,172 | )
Schedule of unrecognized tax benefits [Table Text Block] | The total amount recorded for unrecognized tax benefits is presented below:
| For the Years Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Beginning balance | $ | 446 |  |  | $ | 446 |  |  | $ | 2,782 |
Additions for tax positions of prior years | — |  |  | — |  |  | 9 |
Settlements | — |  |  | — |  |  | (2,345 | )
Ending balance | $ | 446 |  |  | $ | 446 |  |  | $ | 446 |

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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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