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Reserve for Losses and Loss Expenses Reserves for Losses and Loss Expenses | 9 Months Ended
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Sep. 30, 2017
Insurance Loss Reserves [Abstract] |
Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] | Reserves for Losses and Loss Expenses The table below provides a roll forward of reserves for losses and loss expenses for beginning and ending reserve balances:
|  | Nine Months ended September 30,
($ in thousands) |  | 2017 |  | 2016
Gross reserves for losses and loss expenses, at beginning of year |  | $ | 3,691,719 |  |  | 3,517,728 |
Less: reinsurance recoverable on unpaid losses and loss expenses, at beginning of year |  | 611,200 |  |  | 551,019 |
Net reserves for losses and loss expenses, at beginning of year |  | 3,080,519 |  |  | 2,966,709 |
Incurred losses and loss expenses for claims occurring in the: |  |  |  |  |  |
Current year |  | 1,037,079 |  |  | 955,347 |
Prior years |  | (33,461 | ) |  | (43,466 | )
Total incurred losses and loss expenses |  | 1,003,618 |  |  | 911,881 |
Paid losses and loss expenses for claims occurring in the: |  |  |  |  |  |
Current year |  | 314,686 |  |  | 275,623 |
Prior years |  | 581,186 |  |  | 547,067 |
Total paid losses and loss expenses |  | 895,872 |  |  | 822,690 |
Net reserves for losses and loss expenses, at end of period |  | 3,188,265 |  |  | 3,055,900 |
Add: Reinsurance recoverable on unpaid losses and loss expenses, at end of period |  | 647,535 |  |  | 630,686 |
Gross reserves for losses and loss expenses at end of period |  | $ | 3,835,800 |  |  | 3,686,586 |
Prior year development in Nine Months 2017 of $33.5 million was primarily driven by favorable prior year casualty reserve development of $48.3 million in our general liability line of business and $29.3 million in our workers compensation line of business. This was partially offset by unfavorable casualty development of $26.0 million in our commercial automobile line of business, $10.0 million in our Excess and Surplus ("E&S") segment and $4.0 million in our personal automobile line of business. Prior year development in Nine Months 2016 of $43.5 million was primarily due to favorable casualty reserve development of $36.0 million in our workers compensation line of business and $33.0 million in our general liability line of business. This was partially offset by unfavorable casualty reserve development of $20.0 million in our commercial automobile line of business and $3.0 million in our E&S segment. 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 2016 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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