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Reserve for Loss and Loss Expense | 9 Months Ended
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Sep. 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 the reserve for loss and loss expense for beginning and ending reserve balances:
|  | Nine Months ended September 30,
($ in thousands) |  | 2023 |  | 2022
Gross reserve for loss and loss expense, at beginning of period |  | $ | 5,144,821 |  |  | 4,580,903 |
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period |  | 757,513 |  |  | 578,641 |
Net reserve for loss and loss expense, at beginning of period |  | 4,387,308 |  |  | 4,002,262 |
Incurred loss and loss expense for claims occurring in the: |  |  |  |
Current year |  | 1,865,247 |  |  | 1,610,940 |
Prior years |  | (5,782) |  |  | (44,010) |
Total incurred loss and loss expense |  | 1,859,465 |  |  | 1,566,930 |
Paid loss and loss expense for claims occurring in the: |  |  |  |
Current year |  | 607,595 |  |  | 513,118 |
Prior years |  | 988,859 |  |  | 779,438 |
Total paid loss and loss expense |  | 1,596,454 |  |  | 1,292,556 |
Net reserve for loss and loss expense, at end of period |  | 4,650,319 |  |  | 4,276,636 |
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period |  | 651,051 |  |  | 688,641 |
Gross reserve for loss and loss expense, at end of period |  | $ | 5,301,370 |  |  | 4,965,277 |
Prior year reserve development in Nine Months 2023 was favorable by $5.8 million, consisting of $16.5 million of favorable casualty reserve development, partially offset by $10.7 million of unfavorable property reserve development. The favorable casualty reserve development included $24.5 million in our workers compensation line of business and $5.0 million in our Excess and Surplus ("E&S") casualty lines of business, partially offset by $9.0 million of unfavorable casualty reserve development in our personal automobile line of business and $4.0 million in our commercial automobile line of business. Prior year reserve development in Nine Months 2022 was favorable by $44.0 million, consisting of $48.0 million of favorable casualty reserve development, partially offset by $4.0 million of unfavorable property reserve development. The favorable casualty reserve development included $40.0 million in our workers compensation line of business, $10.0 million in our bonds line of business, $8.0 million in our businessowners' policies line of business, and $5.0 million in our general liability line of business, partially offset by $15.0 million of unfavorable casualty reserve development in our commercial automobile line of business.

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- Definition The entire disclosure for liabilities related to future policy benefits and unpaid claims and claim adjustments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//944-40/tableOfContent + Details
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