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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 7 Months Ended 9 Months Ended
Aug. 12, 2019
Sep. 30, 2020
Sep. 30, 2019
Aug. 12, 2019
Sep. 30, 2020
Sep. 30, 2019
Schedule of Investments [Line Items]            
Investment income   $ 13,062 $ 27,441   $ 46,090 $ 92,144
Interest paid on LPT/ADC and Commutation   0 (13,596)   0 (13,596)
Investment expenses   (376) (622)   (1,131) (2,181)
Net investment income   12,686 13,223   44,959 76,367
Interest amount       $ 7,261    
Interest rate       2.64%    
AmTrust Financial Services, Inc. | Commutation And Release Agreement, Commutation Payment, Premium Interest | AmTrust Quota Share Reinsurance Segment            
Schedule of Investments [Line Items]            
Related party interest expense $ 6,335          
Related party rate       3.30%    
Fixed maturities            
Schedule of Investments [Line Items]            
Investment income   7,647 19,798   29,933 69,540
Funds withheld interest            
Schedule of Investments [Line Items]            
Investment income   3,981 5,267   11,843 14,973
Loan to related party            
Schedule of Investments [Line Items]            
Investment income   886 1,777   3,111 5,441
Cash and cash equivalents and other            
Schedule of Investments [Line Items]            
Investment income   $ 548 $ 599   $ 1,203 $ 2,190