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Related Party Transactions (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Class A Common Stock          
Related Party Transaction [Line Items]          
Sale of stock, number of shares issued in transaction (in shares) 0 0      
Series A Preferred Stock          
Related Party Transaction [Line Items]          
Preferred stock dividends declared and paid       $ 11,103 $ 11,103
Affiliated Entity | Series A Preferred Stock | KKR And Snow Phipps          
Related Party Transaction [Line Items]          
Sale of stock, number of shares issued in transaction (in shares)     60,000    
Preferred stock dividends declared and paid       $ 1,822  
Affiliated Entity | Series A-2 Preferred Stock | KKR And Snow Phipps          
Related Party Transaction [Line Items]          
Sale of stock, number of shares issued in transaction (in shares)     15,000