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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