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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]      
Income tax expense (benefit) $ 0 $ (71) $ (8,749)
Income tax expense due to TCJA     $ 243,800
Minimum      
Operating Loss Carryforwards [Line Items]      
Number of tax years open for state tax audit (in years) 3 years    
Maximum      
Operating Loss Carryforwards [Line Items]      
Number of tax years open for state tax audit (in years) 5 years    
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Federal net operating loss carryovers $ 1,400,000    
Operating loss carryforwards, subject to expiration 800,000    
Operating loss carryforwards, not subject to expiration 600,000    
Tax credits, not subject to expiration $ 32,000