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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
7 Months Ended 12 Months Ended
Aug. 12, 2019
Aug. 12, 2019
Dec. 31, 2020
Dec. 31, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income     $ 57,598 $ 114,060
Interest expense paid on LPT/ADC Agreement and Commutation Payment     0 (13,596)
Investment expenses     (2,837) (2,627)
Net investment income     54,761 97,837
Interest amount   $ 7,261    
Interest rate   2.64%    
Fixed maturities        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income     36,258 83,839
Income on funds withheld        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income     15,942 20,307
Interest income from loan to related party        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income     3,996 6,983
Cash and cash equivalents and other investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income     $ 1,402 $ 2,931
Commutation And Release Agreement, Commutation Payment, Premium Interest | AmTrust Quota Share | AmTrust Financial Services, Inc.        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Related party interest expense $ 6,335      
Related party rate   3.30%