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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
State tax effected net operating losses |  |  |  |
Tax benefit attributable to tax reform |  | $ 242,875 | $ 0 | $ 0
Effective tax rate |  | 143.95% | 36.76% | 39.18%
Alternative minimum tax credits | $ 208,624 | $ 208,624 | $ 218,773 |
Unrecognized tax benefits | 700 | 700 |  |
Federal |  |  |  |
State tax effected net operating losses |  |  |  |
Net operating loss carryforwards | 839,300 | 839,300 |  |
State Tax Reporting |  |  |  |
State tax effected net operating losses |  |  |  |
Net operating loss carryforwards | 543,700 | 543,700 |  |
Valuation allowance on operating loss carryforwards | 5,000 | $ 5,000 |  |
Refundable Portion Of AMT Credits |  |  |  |
State tax effected net operating losses |  |  |  |
Valuation allowance recorded | $ 10,700 |  |  |
Previously reported |  |  |  |
State tax effected net operating losses |  |  |  |
Effective tax rate |  | 37.60% |  |

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