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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable prior year reserve development | $ 85,354 | $ 42,115 | $ 128,847 | $ 96,613
Short Tail Lines Insurance And Reinsurance Business [Member] |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable prior year reserve development | 73,000 | 32,000 | 101,000 | 62,000
Liability Reinsurance Business [Member] |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable prior year reserve development | 6,000 | 22,000 | 12,000 | 38,000
Professional Lines Reinsurance Business [Member] |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable prior year reserve development | $ 6,000 |  | $ 12,000 |

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- Definition Amount of provision in the period for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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