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Reserve for Loss and Loss Adjustment Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2019
Jul. 01, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Jul. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Sep. 30, 2020
Dec. 31, 2019
Insurance [Abstract]                      
Reserve for reported loss and LAE                   $ 1,039,079 $ 1,271,358
Reserve for losses incurred but not reported ("IBNR")                   935,994 1,168,549
Reserve for loss and LAE     $ 3,126,134 $ 1,975,073 $ 2,625,858 $ 3,126,134 $ 2,439,907 $ 2,625,858 $ 3,126,134 $ 1,975,073 $ 2,439,907
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]                      
Gross loss and LAE reserves, January 1           3,126,134 2,439,907 3,126,134 3,126,134    
Less: reinsurance recoverable on unpaid losses, January 1           71,901 623,422 71,901 71,901    
Net loss and LAE reserves, January 1           3,054,233 1,816,485 3,054,233 3,054,233    
Net incurred losses related to Current year             48,988 318,654      
Net incurred losses related to Prior year             (7,829) 96,456      
Net loss and loss adjustment expenses       9,065 140,860   41,159 415,110      
Net paid losses related to Current year             (5,253) (8,969)      
Net paid losses related to Prior years             (519,864) (872,125)      
Net paid losses             (525,117) (881,094)      
Retroactive reinsurance adjustment             32,955 (549,542)      
Effect of foreign exchange rate movements             11,914 (28,330)      
Net loss and LAE reserves, September 30     3,054,233 1,377,396 2,010,377   1,377,396 2,010,377 1,816,485    
Reinsurance recoverable on unpaid losses, September 30     71,901 597,677 615,481   597,677 615,481 623,422    
Gross loss and LAE reserves, September 30     3,126,134 1,975,073 2,625,858   1,975,073 2,625,858 2,439,907    
Segment Reporting Information [Line Items]                      
Net adverse prior year development (net favorable prior year reserve development)       (7,236) 63,184   (7,829) 96,456      
Deferred gain on retroactive reinsurance, increase (decrease)               104,542      
Workers Compensation                      
Segment Reporting Information [Line Items]                      
Deferred gain on retroactive reinsurance, increase (decrease)             (23,705)        
AmTrust Quota Share Reinsurance Segment                      
Segment Reporting Information [Line Items]                      
Deferred gain on retroactive reinsurance, increase (decrease)             (9,250)        
Post-Termination Endorsement, Maximum Loss Corridor | AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment                      
Segment Reporting Information [Line Items]                      
Net adverse prior year development (net favorable prior year reserve development)         27,587     27,587      
Related party transaction amount $ 40,500                    
Commutation And Release Agreement Commutation Payment | AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment                      
Segment Reporting Information [Line Items]                      
Related party transaction amount   $ 312,786                  
Commutation And Release Agreement Net Ceded Reserves | AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment                      
Segment Reporting Information [Line Items]                      
Related party transaction amount     $ 330,682                
Commutation And Release Agreement Commutation Payment Paid By Entity | AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment                      
Segment Reporting Information [Line Items]                      
Related party transaction amount           $ 17,896          
Other                      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]                      
Net loss and loss adjustment expenses         108     312      
Segment Reporting Information [Line Items]                      
Net adverse prior year development (net favorable prior year reserve development)         108     312      
Diversified Reinsurance                      
Segment Reporting Information [Line Items]                      
Net adverse prior year development (net favorable prior year reserve development)       483 692   312 (1,456)      
AmTrust Reinsurance                      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]                      
Less: reinsurance recoverable on unpaid losses, January 1             557,950        
Reinsurance recoverable on unpaid losses, September 30       524,995     524,995   $ 557,950    
Segment Reporting Information [Line Items]                      
Net adverse prior year development (net favorable prior year reserve development)       $ (7,719) $ 62,384   $ (8,141) $ 97,600