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Reserve for Loss and Loss Expense Reserves for Loss and Loss Expense | 3 Months Ended
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Mar. 31, 2018
Insurance Loss Reserves [Abstract] |
Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] | 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:
|  | Quarter ended March 31,
($ in thousands) |  | 2018 |  | 2017
Gross reserve for loss and loss expense, at beginning of year |  | $ | 3,771,240 |  |  | 3,691,719 |
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year |  | 585,855 |  |  | 611,200 |
Net reserve for loss and loss expense, at beginning of year |  | 3,185,385 |  |  | 3,080,519 |
Incurred loss and loss expense for claims occurring in the: |  |  |  |  |  |
Current year |  | 388,801 |  |  | 331,331 |
Prior years |  | (3,860 | ) |  | (13,859 | )
Total incurred loss and loss expense |  | 384,941 |  |  | 317,472 |
Paid loss and loss expense for claims occurring in the: |  |  |  |  |  |
Current year |  | 79,345 |  |  | 54,708 |
Prior years |  | 248,738 |  |  | 235,742 |
Total paid loss and loss expense |  | 328,083 |  |  | 290,450 |
Net reserve for loss and loss expense, at end of period |  | 3,242,243 |  |  | 3,107,541 |
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period |  | 549,837 |  |  | 571,930 |
Gross reserve for loss and loss expense at end of period |  | $ | 3,792,080 |  |  | 3,679,471 |
The $57.5 million increase in current year loss and loss expense incurred illustrated in the table above was driven by catastrophe losses and non-catastrophe property losses. Catastrophe losses, which increased $13.8 million, to $26.0 million in First Quarter 2018, were primarily related to the winter storms that impacted the east coast of the United States in early January and several Nor'easters in March. Non-catastrophe property losses, which increased $34.3 million, to $105.7 million in First Quarter 2018, were principally related to the early January deep freeze in our footprint states and a relatively large number of severe fire losses. 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 development included $16.0 million of development in our workers compensation line of business, partially offset by $8.0 million of unfavorable casualty reserve development in our commercial automobile line of business. Prior year development in First Quarter 2017 of $13.9 million was primarily due to favorable casualty reserve development of $22.4 million in our general liability line of business. This was partially offset by unfavorable casualty reserve development of $6.0 million in our commercial automobile line of business. For a discussion of the trends and recent developments impacting these lines, refer to the "Critical Accounting Policies and Estimates" section of Item 7. "Management's Discussion and Analysis of Financial Condition and Results of Operations." in our 2017 Annual Report.

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