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Historical Loss and LAE Development - Schedule of Reconciliation of Unpaid Losses and Settlement Expenses (LAE) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Unpaid losses and LAE at beginning of year    
Gross $ 2,315,637 $ 2,043,555
Ceded (740,089) (608,086)
Net 1,575,548 1,435,469
Increase (decrease) in incurred losses and LAE    
Current accident year 551,975 491,559
Prior accident years (93,986) (103,032)
Total incurred 457,989 388,527
Loss and LAE payments for claims incurred    
Current accident year (113,010) (52,435)
Prior accident years (252,786) (219,682)
Total paid (365,796) (272,117)
Net unpaid losses and LAE at September 30 1,667,741 1,551,879
Unpaid losses and LAE at September 30    
Gross 2,488,695 2,322,737
Ceded (820,954) (770,858)
Net unpaid losses and LAE at September 30 $ 1,667,741 $ 1,551,879