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Stock-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Feb. 19, 2019
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Stock-based Compensation arrangements            
Stock based compensation expense   $ 11,400,000   $ 2,100,000 $ 36,000,000.0 $ 24,000,000.0
Restricted Stock Units            
Stock-based Compensation arrangements            
Granted (in shares)         127,165  
Granted (in dollars per share)         $ 15.80  
Performance Share Awards | Minimum            
Stock-based Compensation arrangements            
Annual forfeiture rate assumption (as a percent)         0.00%  
Performance Share Awards | Maximum            
Stock-based Compensation arrangements            
Annual forfeiture rate assumption (as a percent)         5.00%  
Performance Share Awards Based on Internal Performance Metrics            
Stock-based Compensation arrangements            
Right to receive additional shares, maximum         100.00%  
Employee Performance Share Awards            
Stock-based Compensation arrangements            
Granted (in shares)         722,500  
Granted (in dollars per share)         $ 15.60  
Minimum operating cash flow for the year preceding the performance period     $ 100,000,000      
Number of years over which performance criteria is to be met         3 years  
Employee Performance Share Awards | Tranche three            
Stock-based Compensation arrangements            
Award vesting rights (as a percent)   100.00%        
Hybrid Performance Share Awards            
Stock-based Compensation arrangements            
Granted (in shares)         506,412  
Granted (in dollars per share)         $ 15.60  
Minimum operating cash flow for the year preceding the performance period         $ 100,000,000  
Hybrid Performance Share Awards | Tranche one            
Stock-based Compensation arrangements            
Award vesting rights (as a percent)         25.00%  
Hybrid Performance Share Awards | Tranche two            
Stock-based Compensation arrangements            
Award vesting rights (as a percent)         25.00%  
Hybrid Performance Share Awards | Tranche three            
Stock-based Compensation arrangements            
Award vesting rights (as a percent)         50.00%  
Performance Shares Based on Market Conditions            
Stock-based Compensation arrangements            
Right to receive shares         100.00%  
Right to receive an additional award in cash         100.00%  
TSR Performance Share Awards            
Stock-based Compensation arrangements            
Granted (in shares)         862,180  
Granted (in dollars per share) $ 13.79          
Performance period         3 years  
TSR Performance Share Awards | Minimum            
Stock-based Compensation arrangements            
Granted (in dollars per share)         $ 13.28  
TSR Performance Share Awards | Maximum            
Stock-based Compensation arrangements            
Granted (in dollars per share)         $ 17.30