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Income Taxes Income Taxes - Tax Attributes and Valuation Allowances (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2018 | Apr. 30, 2018
Operating Loss Carryforwards |  |  |  |
Deferred tax assets net | $ 131,521 | $ 173,146 |  |
Valuation allowances | 822 | 1,027 |  |
Tax benefit from adjustments to valuation allowance | 50,200 |  |  |
Increase in deferred tax assets | 50,200 |  |  |
Domestic |  |  |  |
Operating Loss Carryforwards |  |  |  |
Operating loss carryforwards |  | 696,300 |  |
Operating loss carryforward not subject to expiration |  | 457,300 |  |
Tax credit carryforward |  | 2,500 |  |
State |  |  |  |
Operating Loss Carryforwards |  |  |  |
Operating loss carryforwards |  | 257,600 |  |
Operating loss carryforward not subject to expiration |  | 88,300 |  |
NOL valuation allowance | 800 | 1,000 |  |
Tax credit carryforward |  | $ 200 |  |
Net Operating Loss Carryforward | State |  |  |  |
Operating Loss Carryforwards |  |  |  |
Change in deferred tax asset valuation allowance | 600 |  |  |
Continuing Operations |  |  |  |
Operating Loss Carryforwards |  |  |  |
Increase in deferred tax assets | 44,600 |  |  |
Discontinued Operations |  |  |  |
Operating Loss Carryforwards |  |  |  |
Increase in deferred tax assets | 5,600 |  |  |
Merger Transaction |  |  |  |
Operating Loss Carryforwards |  |  |  |
Deferred tax assets resulting from merger |  |  | $ 156,000 | $ 156,000
Deferred tax assets net |  |  | 52,200 | 52,200
Valuation allowances |  |  | 50,800 | $ 50,800
Change in deferred tax asset valuation allowance | $ (50,800) |  |  |
Merger Transaction | Continuing Operations |  |  |  |
Operating Loss Carryforwards |  |  |  |
Deferred tax assets net |  |  | 46,600 |
Valuation allowances |  |  | 45,200 |
Merger Transaction | Discontinued Operations |  |  |  |
Operating Loss Carryforwards |  |  |  |
Deferred tax assets net |  |  | 5,600 |
Valuation allowances |  |  | $ 5,600 |

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