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Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Current |  |  |
Federal | $ 0 | $ 0 | $ 0
State | 86 | (317) | (83)
Total current | (86) | 317 | 83
Deferred |  |  |
Federal | 10,308 | 3,410 | 24,219
State | 87 | 644 | 449
Valuation allowance | (10,385) | (4,308) | (392)
Total deferred | (10) | 254 | (24,276)
Income tax (expense) benefit | $ (96) | $ 571 | $ (24,193)

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