Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

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Income Taxes - Narrative (Details) - USD ($)
 4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2019
Aug. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Tax Credit Carryforward [Line Items]          
Deferred tax assets, increase in valuation allowance     $ 39,424,000    
Deferred tax assets, increase in valuation allowance, current federal income tax benefit     (37,669,000)    
Net operating loss $ 3,648,000 $ (47,565,000) 99,600,000 $ 494,143,000  
Operating loss carryforwards, limitation as per IRC     510,000    
Accrued interest and penalties related to uncertain tax positions     143,000    
Expected increase in uncertain tax position in next twelve months     0    
Expected decrease in uncertain tax position in next twelve months     0    
Cash tax refund received, margin tax previously paid with the original filings     9,000,000    
Federal          
Tax Credit Carryforward [Line Items]          
Operating loss carryforwards     483,404,000    
Net operating loss         $ 306,134,000
State          
Tax Credit Carryforward [Line Items]          
Operating loss carryforwards     202,995,000    
Tax credit carryforward     $ 584,000