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Historical Loss and LAE Development - Reconciliation of Unpaid Losses and Settlement Expenses (LAE) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Unpaid losses and LAE at beginning of year    
Gross $ 2,446,025 $ 2,315,637
Ceded (757,349) (740,089)
Net 1,688,676 1,575,548
Increase (decrease) in incurred losses and LAE    
Current accident year 186,217 166,270
Prior accident years (42,393) (51,782)
Total incurred 143,824 114,488
Loss and LAE payments for claims incurred    
Current accident year (12,975) (7,983)
Prior accident years (102,011) (95,905)
Total paid (114,986) (103,888)
Net unpaid losses and LAE at March 31 1,717,514 1,586,148
Unpaid losses and LAE at March 31    
Gross 2,532,190 2,286,063
Ceded (814,676) (699,915)
Net unpaid losses and LAE at March 31 $ 1,717,514 $ 1,586,148