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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, 2022
Sep. 30, 2021
Unpaid losses and LAE at beginning of year    
Gross $ 2,043,555 $ 1,750,049
Ceded (608,086) (443,729)
Net 1,435,469 1,306,320
Increase (decrease) in incurred losses and LAE    
Current accident year 491,559 452,542
Prior accident years (103,032) (96,968)
Total incurred 388,527 355,574
Loss and LAE payments for claims incurred    
Current accident year (52,435) (58,411)
Prior accident years (219,682) (172,120)
Total paid (272,117) (230,531)
Net unpaid losses and LAE at September 30 1,551,879 1,431,363
Unpaid losses and LAE at September 30    
Gross 2,322,737 2,033,517
Ceded (770,858) (602,154)
Net unpaid losses and LAE at September 30 $ 1,551,879 $ 1,431,363