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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
State tax effected net operating losses        
TCJA tax benefit     $ 242,900  
Effective tax rate 24.34% 20.21% 143.95%  
Alternative minimum tax credits $ 22,120 $ 114,149    
Valuation allowance on deferred tax benefits related to equity method investments 31,763 14,943    
Net reserve for unrecognized tax benefits related to alternative minimum tax 16,330 0 $ 0  
Liability for accrued interest 3,100      
Unrecognized tax benefits 520 $ 16,850 $ 663 $ 663
State        
State tax effected net operating losses        
Net operating loss carryforwards 390,100      
Valuation allowance on operating loss carryforwards $ 13,600      
Excluding Impact of Tax Reform        
State tax effected net operating losses        
Effective tax rate 24.30% 21.80% 37.60%  
Equity Method Investments        
State tax effected net operating losses        
Valuation allowance on deferred tax benefits related to equity method investments $ 18,100