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Historical Loss and LAE Development - Schedule of Reconciliation of Unpaid Losses and Settlement Expenses (LAE) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 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 166,270 150,999
Prior accident years (51,782) (45,475)
Total incurred 114,488 105,524
Loss and LAE payments for claims incurred    
Current accident year (7,983) (7,875)
Prior accident years (95,905) (82,851)
Total paid (103,888) (90,726)
Net unpaid losses and LAE at end of year 1,586,148 1,450,267
Unpaid losses and LAE at end of year    
Gross 2,286,063 2,081,712
Ceded (699,915) (631,445)
Net unpaid losses and LAE at end of year $ 1,586,148 $ 1,450,267