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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Proceeds from Income Tax Refunds |  |  | $ 5,900 |
Components of the provision for income taxes |  |  |  |
Federal | $ 0 | $ 2,832 | 0 | $ 0
State | (85) | (230) | (670) | (1,633)
Deferred portion of income tax (expense) benefit | 36,833 | 36,668 | (60,672) | 67,458
Income tax (expense) benefit | $ 36,748 | $ 39,270 | $ (61,342) | $ 65,825
Effective tax rate | 21.30% | 30.60% | 23.60% | 32.80%
Tax Year 2017 [Member] |  |  |  |
Federal enacted statutory income tax rate, percent |  |  | 35.00% |
Future tax years [Member] |  |  |  |
Federal enacted statutory income tax rate, percent |  |  | 21.00% |

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