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Income Taxes - Net Operating Losses and Tax Rates (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Net operating losses |  |
Statutory Federal income tax rate (as a percent) | 35.00% |
Alternative minimum tax credit without expiration | $ 23,443 | $ 17,589
Tax credit recovery period | 4 years |
Federal |  |
Net operating losses |  |
Operating loss carryforward | $ 491,400 | 763,900
Estimated effective tax rate on net operating losses | 3.36 |
State |  |
Net operating losses |  |
Operating loss carryforward | $ 302,500 | $ 469,200
Estimated effective tax rate on net operating losses | 21.0 |

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