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Related Party Loan (Details) - USD ($)
12 Months Ended
Aug. 22, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]        
Current portion of related party loans   $ 0 $ 41,800,000  
Senior Secured Loan | Unit holder of Parent        
Related Party Transaction [Line Items]        
Current portion of related party loans     41,800,000  
Interest expense   $ 3,800,000 $ 7,300,000 $ 2,600,000
Senior Secured Loan | Unit holder of Parent | Secured Debt        
Related Party Transaction [Line Items]        
Senior secured promissory note $ 38,600,000      
Stated rate 12.00%      
Tranche A | Unit holder of Parent | Secured Debt        
Related Party Transaction [Line Items]        
Senior secured promissory note $ 22,500,000      
Tranche B | Unit holder of Parent | Secured Debt        
Related Party Transaction [Line Items]        
Senior secured promissory note $ 16,100,000