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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
State tax effected net operating losses |  |  |  |
Effective tax rate | 16.84% | 24.34% | 20.21% |
Alternative minimum tax credits | $ 0 | $ 22,120 |  |
Valuation allowance on deferred tax benefits related to equity method investments | 28,231 | 31,763 |  |
Unrecognized tax benefits | 6,484 | $ 520 | $ 16,850 | $ 663
Liability for accrued interest | 600 |  |  |
State |  |  |  |
State tax effected net operating losses |  |  |  |
Net operating loss carryforwards | 382,500 |  |  |
Valuation allowance on operating loss carryforwards | 13,100 |  |  |
Research and development tax credits |  |  |  |
State tax effected net operating losses |  |  |  |
Unrecognized tax benefits | 6,000 |  |  |
Liability for accrued interest | 500 |  |  |
Capital loss carryforward |  |  |  |
State tax effected net operating losses |  |  |  |
Tax credit carryforward | 72,200 |  |  |
Tax credit carryforwards valuation allowance | $ 14,900 |  |  |

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