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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Valuation Allowance [Line Items] |  |  |
Federal net operating losses | $ 215,936,000 | $ 202,913,000 |
Deferred tas asset, federal alternative minimum tax credit | 0 | 51,241,000 |
Decrease in federal alternative minimum tax | 51,241,000 |  |
Valuation allowance on foreign tax credits | 43,194,000 | 43,194,000 |
Valuation allowance | 123,098,000 | 125,054,000 |
Deferred tax asset related to state operating losses | 129,641,000 | 130,430,000 |
Reduction in income tax expense due to non-controlling interest | 11,556,000 | 23,662,000 | $ 18,181,000
Benefit through realization of the Federal NOLs |  |  | 23,483,000
AMT credit carry-forward |  |  | $ 12,413,000
Unrecognized tax benefits that would impact effective tax rate | 31,891,000 | 31,516,000 |
Increase in unrecognized tax benefits resulting from tax position taken on prior year return | 1,726,000 | 0 |
Reduction to unrecognized tax benefits, from position taken on state tax return | 1,351,000 | 0 |
Accrued liability relating to uncertain tax positions | 0 | 0 |
Interest related to income tax deficiencies | 0 | 0 |
Accrued liabilities for tax penalties | 0 | 0 |
State Operating Losses |  |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | $ 79,197,000 | $ 81,202,000 |

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