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Income Taxes Income Taxes - Tax Attributes and Valuation Allowances (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Apr. 30, 2018
Operating Loss Carryforwards        
Deferred tax assets net $ 131,521 $ 173,146    
Valuation allowances 822 1,027    
Tax benefit from adjustments to valuation allowance 50,200      
Increase in deferred tax assets 50,200      
Domestic        
Operating Loss Carryforwards        
Operating loss carryforwards   696,300    
Operating loss carryforward not subject to expiration   457,300    
Tax credit carryforward   2,500    
State        
Operating Loss Carryforwards        
Operating loss carryforwards   257,600    
Operating loss carryforward not subject to expiration   88,300    
NOL valuation allowance 800 1,000    
Tax credit carryforward   $ 200    
Net Operating Loss Carryforward | State        
Operating Loss Carryforwards        
Change in deferred tax asset valuation allowance 600      
Continuing Operations        
Operating Loss Carryforwards        
Increase in deferred tax assets 44,600      
Discontinued Operations        
Operating Loss Carryforwards        
Increase in deferred tax assets 5,600      
Merger Transaction        
Operating Loss Carryforwards        
Deferred tax assets resulting from merger     $ 156,000 $ 156,000
Deferred tax assets net     52,200 52,200
Valuation allowances     50,800 $ 50,800
Change in deferred tax asset valuation allowance $ (50,800)      
Merger Transaction | Continuing Operations        
Operating Loss Carryforwards        
Deferred tax assets net     46,600  
Valuation allowances     45,200  
Merger Transaction | Discontinued Operations        
Operating Loss Carryforwards        
Deferred tax assets net     5,600  
Valuation allowances     $ 5,600