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Reserve for Loss and Loss Expense (Tables)
9 Months Ended
Sep. 30, 2022
Insurance Loss Reserves [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense
Nine Months ended September 30,
($ in thousands)20222021
Gross reserve for loss and loss expense, at beginning of period$4,580,903 4,260,355 
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period578,641 554,269 
Net reserve for loss and loss expense, at beginning of period4,002,262 3,706,086 
Incurred loss and loss expense for claims occurring in the:  
Current year1,610,940 1,408,240 
Prior years(44,010)(67,947)
Total incurred loss and loss expense1,566,930 1,340,293 
Paid loss and loss expense for claims occurring in the:  
Current year513,118 430,288 
Prior years779,438 675,782 
Total paid loss and loss expense1,292,556 1,106,070 
Net reserve for loss and loss expense, at end of period4,276,636 3,940,309 
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period688,641 670,031 
Gross reserve for loss and loss expense at end of period$4,965,277 4,610,340