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Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
U.S. statutory rate | $ 10,393 | $ 4,159 | $ 24,136
Increase (decrease) resulting from: |  |  |
Permanent differences | (85) | (206) | (330)
State income taxes | 173 | (571) | 366
Other | (13) | 374 | (118)
Vesting of common stock | 13 | (19) | (253)
Change in valuation allowance | (10,385) | (4,308) | 392
Income tax (expense) benefit | $ 96 | $ (571) | $ 24,193
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
U.S. statutory rate | 21.00% | 21.00% | 35.00%
Increase (decrease) resulting from: |  |  |
Permanent differences | (0.20%) | (1.00%) | 0.50%
State income taxes | 0.40% | (2.90%) | (0.50%)
Other | 0.00% | 1.90% | 0.20%
Vesting of common stock | 0.00% | (0.10%) | 0.40%
Change in valuation allowance | (21.00%) | (21.70%) | (0.50%)
Income tax (expense) benefit | 0.20% | (2.80%) | 35.10%

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