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Reserve for Losses and Loss Expenses Reserves for Losses and Loss Expenses | 6 Months Ended
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Jun. 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:
|  | Six Months ended June 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 |  | 684,877 |  |  | 624,159 |
Prior years |  | (25,846 | ) |  | (28,536 | )
Total incurred losses and loss expenses |  | 659,031 |  |  | 595,623 |
Paid losses and loss expenses for claims occurring in the: |  |  |  |  |  |
Current year |  | 171,724 |  |  | 146,849 |
Prior years |  | 425,521 |  |  | 402,255 |
Total paid losses and loss expenses |  | 597,245 |  |  | 549,104 |
Net reserves for losses and loss expenses, at end of period |  | 3,142,305 |  |  | 3,013,228 |
Add: Reinsurance recoverable on unpaid losses and loss expenses, at end of period |  | 588,916 |  |  | 576,941 |
Gross reserves for losses and loss expenses at end of period |  | $ | 3,731,221 |  |  | 3,590,169 |
Prior year development in Six Months 2017 of $25.8 million was primarily driven by favorable prior year casualty reserve development of $37.4 million in our general liability line of business and $15.3 million in our workers compensation line of business. This was partially offset by unfavorable casualty reserve development of $21.0 million in our commercial automobile line of business and $4.0 million in our personal automobile line of business. Prior year development in Six Months 2016 of $28.5 million was primarily due to favorable casualty reserve development of $22.0 million in our general liability line of business and $21.0 million in our workers compensation line of business. This was partially offset by unfavorable casualty reserve development of $13.0 million in our commercial automobile line of business and $3.0 million in our E&S segment.

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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 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14754-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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