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Related Party Transactions - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Feb. 12, 2021
Nov. 30, 2020
May 06, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]              
Fair value of the shares purchased           $ 14,000  
Interest rate           2.00%  
Repurchases of common stock from related parties financed by promissory notes           $ 9,074  
Percentage of principal amount discounted           19.00%  
Line of credit non current outstanding $ 400,000            
Affiliated Entity [Member] | K K R Capital Markets L L C [Member]              
Related Party Transaction [Line Items]              
Expenses from transactions with related party       $ 1,500      
Unsecured Debt              
Related Party Transaction [Line Items]              
Debt instrument, Term           5 years  
Issuance Of First Unsecured Debt | Unsecured Debt              
Related Party Transaction [Line Items]              
Long term note payable issued for shares repurchased           $ 10,000  
Issuance Of Second Unsecured Debt | Unsecured Debt              
Related Party Transaction [Line Items]              
Long term note payable issued for shares repurchased           $ 1,200  
Class A Common Stock | Chief Executive Officer              
Related Party Transaction [Line Items]              
Number of shares repurchased by the company           2,475,000  
Class A Common Stock | Director              
Related Party Transaction [Line Items]              
Number of shares repurchased by the company           300,000  
Fifth Amendment Term Loan And Revolving Credit Facility              
Related Party Transaction [Line Items]              
Debt issuance costs paid to related party   $ 800     $ 1,500 $ 2,000 $ 6,500
Amended Revolving Credit Facility              
Related Party Transaction [Line Items]              
Proceeds from long term line of credit facility 250,000            
Line of credit facility maximum borrowing capacity $ 600,000   $ 150,000        
Interest rate     2.50%