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Reserve for Loss and Loss Expense
6 Months Ended
Jun. 30, 2022
Insurance Loss Reserves [Abstract]  
Reserve for Loss and Loss Expense Reserve for Loss and Loss Expense
The table below provides a roll forward of reserve for loss and loss expense for beginning and ending reserve balances:

Six Months ended June 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 year1,041,778 886,801 
Prior years(22,674)(51,777)
Total incurred loss and loss expense1,019,104 835,024 
Paid loss and loss expense for claims occurring in the:  
Current year272,401 227,505 
Prior years570,868 455,919 
Total paid loss and loss expense843,269 683,424 
Net reserve for loss and loss expense, at end of period4,178,097 3,857,686 
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period544,082 579,567 
Gross reserve for loss and loss expense at end of period$4,722,179 4,437,253 

Prior year reserve development in Six Months 2022 was favorable by $22.7 million, consisting of $32.0 million of favorable casualty reserve development, partially offset by $9.3 million of unfavorable property reserve development. The favorable casualty reserve development included $20.0 million in our workers compensation line of business, $7.0 million in our bonds line of business, and $5.0 million in our general liability line of business.

Prior year reserve development in Six Months 2021 was favorable by $51.8 million, consisting of $52.0 million of casualty reserve development. The favorable casualty reserve development included $25.0 million in our general liability line of business, $20.0 million in our workers compensation line of business, and $7.0 million in our Excess and Surplus (E&S") casualty lines of business.