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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
State tax effected net operating losses |  |  |  |
TCJA tax benefit | $ 11,400 | $ 242,900 |  |
Effective tax rate | 20.21% | 143.95% | 36.76% |
Alternative minimum tax credits | $ 114,149 | $ 208,624 |  |
Valuation allowance | 14,943 | 16,711 |  |
Unrecognized tax benefits | 16,850 | $ 663 | $ 663 | $ 663
Liability for accrued interest | 3,100 |  |  |
Federal |  |  |  |
State tax effected net operating losses |  |  |  |
Net operating loss carryforwards | 142,600 |  |  |
State Tax Reporting |  |  |  |
State tax effected net operating losses |  |  |  |
Net operating loss carryforwards | 468,100 |  |  |
Valuation allowance on operating loss carryforwards | $ 14,100 |  |  |
Excluding Impact of Tax Reform |  |  |  |
State tax effected net operating losses |  |  |  |
Effective tax rate | 21.80% | 37.60% |  |
Refundable Portion Of AMT Credits |  |  |  |
State tax effected net operating losses |  |  |  |
TCJA tax benefit | $ 10,700 |  |  |
Valuation allowance |  | $ 10,700 |  |

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