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Income Taxes - Net Operating Losses and Tax Rates (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net operating losses |  |  |
Statutory Federal income tax rate (as a percent) | 21.00% | 35.00% | 35.00%
Alternative minimum tax credits | $ 15,744 | $ 23,443 |
Tax credit recovery period | 3 years |  |
Federal |  |  |
Net operating losses |  |  |
Operating loss carryforward | $ 1,504,900 | 491,400 |
Estimated effective tax rate on net operating losses | 21.00% |  |
State |  |  |
Net operating losses |  |  |
Operating loss carryforward | $ 562,000 | $ 302,500 |
Estimated effective tax rate on net operating losses | 3.36% |  |

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