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Reserve for Loss and Loss Expense (Tables)
3 Months Ended
Mar. 31, 2021
Insurance Loss Reserves [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense
Quarter ended March 31,
($ in thousands)20212020
Gross reserve for loss and loss expense, at beginning of year$4,260,355 4,067,163 
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year1
554,269 547,066 
Net reserve for loss and loss expense, at beginning of year3,706,086 3,520,097 
Incurred loss and loss expense for claims occurring in the:  
Current year447,170 407,276 
Prior years(33,769)(6,952)
Total incurred loss and loss expense413,401 400,324 
Paid loss and loss expense for claims occurring in the:  
Current year80,158 70,610 
Prior years243,687 281,736 
Total paid loss and loss expense323,845 352,346 
Net reserve for loss and loss expense, at end of period3,795,642 3,568,075 
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period564,546 535,560 
Gross reserve for loss and loss expense at end of period$4,360,188 4,103,635 
1First Quarter 2020 includes an adjustment of $2.9 million related to our adoption of ASU 2016-13, Financial Instruments - Credit Losses.