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Reserve for Loss and Loss Expense | 6 Months Ended
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Jun. 30, 2019
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 balances:
|  | Six Months ended June 30,
($ in thousands) |  | 2019 |  | 2018
Gross reserve for loss and loss expense, at beginning of year |  | $ | 3,893,868 |  |  | 3,771,240 |
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year |  | 537,388 |  |  | 585,855 |
Net reserve for loss and loss expense, at beginning of year |  | 3,356,480 |  |  | 3,185,385 |
Incurred loss and loss expense for claims occurring in the: |  |  |  |  |  |
Current year |  | 783,938 |  |  | 756,855 |
Prior years |  | (16,375 | ) |  | (5,586 | )
Total incurred loss and loss expense |  | 767,563 |  |  | 751,269 |
Paid loss and loss expense for claims occurring in the: |  |  |  |  |  |
Current year |  | 210,374 |  |  | 214,169 |
Prior years |  | 442,820 |  |  | 457,441 |
Total paid loss and loss expense |  | 653,194 |  |  | 671,610 |
Net reserve for loss and loss expense, at end of period |  | 3,470,849 |  |  | 3,265,044 |
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period |  | 556,203 |  |  | 539,321 |
Gross reserve for loss and loss expense at end of period |  | $ | 4,027,052 |  |  | 3,804,365 |
Prior year reserve development in Six Months 2019 of $16.4 million was primarily driven by favorable casualty reserve development of $20.0 million in our workers compensation line of business and $7.0 million in our general liability line of business. This was partially offset by $10.6 million of unfavorable property reserve development in Six Months 2019. Prior year reserve development in Six Months 2018 of $5.6 million included $12.0 million of favorable casualty reserve development, partially offset by $6.4 million of unfavorable property reserve development. The favorable casualty reserve development included $33.0 million of development in our workers compensation line of business, partially offset by $15.0 million of unfavorable reserve development in our commercial automobile line of business and $6.0 million in our excess and surplus ("E&S") casualty lines.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -URI http://asc.fasb.org/subtopic&trid=2560295 + Details
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