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Reserve for Losses and Loss Expenses Reserves for Losses and Loss Expenses (Tables) | 6 Months Ended
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Jun. 30, 2017
Insurance Loss Reserves [Abstract] |
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] |
|  | 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 |

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- References No definition available. + Details
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- Definition Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims. + References Reference 1: 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
Name: | us-gaap_ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense
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