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Reserve for Loss and Loss Adjustment Expenses - Schedule for Reserve for Loss and LAE (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Insurance [Abstract]      
Reserve for reported loss and LAE $ 487,112   $ 543,818
Reserve for losses incurred but not reported ("IBNR") 326,767   323,615
Reserve for loss and LAE 813,879 $ 1,071,623 $ 867,433
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Gross loss and LAE reserves, January 1 867,433 1,131,408  
Less: reinsurance recoverable on unpaid losses, January 1 564,331 556,116  
Net loss and LAE reserves, January 1 303,102 575,292  
Net incurred losses related to Current year 5,062 6,159  
Net incurred losses related to Prior year 6,563 3,656  
Net 11,625 9,815  
Net paid losses related to Current year (125) (75)  
Net paid losses related to Prior years (59,590) (73,013)  
Net paid losses (59,715) (73,088)  
Change in deferred gain on retroactive reinsurance (4,982) (1,573)  
GLS run-off business acquired or assumed 0 767  
Opening allowance for expected credit loss on reinsurance recoverable on unpaid losses 0 4,286  
Effect of foreign exchange rate movements (5,497) 3,611  
Net loss and LAE reserves, March 31 244,533 519,110  
Reinsurance recoverable on unpaid losses, March 31 569,346 552,513  
Gross loss and LAE reserves, March 31 $ 813,879 $ 1,071,623