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Reserve for Loss and Loss Expense | 3 Months Ended
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Mar. 31, 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:
|  | Quarter ended March 31,
($ 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 |  | 397,253 |  |  | 388,801 |
Prior years |  | (10,674 | ) |  | (3,860 | )
Total incurred loss and loss expense |  | 386,579 |  |  | 384,941 |
Paid loss and loss expense for claims occurring in the: |  |  |  |  |  |
Current year |  | 73,964 |  |  | 79,345 |
Prior years |  | 246,168 |  |  | 248,738 |
Total paid loss and loss expense |  | 320,132 |  |  | 328,083 |
Net reserve for loss and loss expense, at end of period |  | 3,422,927 |  |  | 3,242,243 |
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period |  | 543,582 |  |  | 549,837 |
Gross reserve for loss and loss expense at end of period |  | $ | 3,966,509 |  |  | 3,792,080 |
Prior year development in First Quarter 2019 of $10.7 million was primarily driven by favorable casualty development of $8.0 million in our workers compensation line of business and $2.0 million in our general liability line of business. Prior year development in First Quarter 2018 of $3.9 million included $8.0 million of favorable casualty development and $4.1 million of unfavorable property development. The favorable casualty reserve development included $16.0 million in our workers compensation line of business, partially offset by unfavorable development of $8.0 million 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://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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