v2.4.0.8

RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable prior year reserve development | $ 42,115 | $ 74,612 | $ 96,613 | $ 119,840
Short Tail Lines Insurance And Reinsurance Business [Member] |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable prior year reserve development | 32,000 | 68,000 | 62,000 | 87,000
Liability Reinsurance Business [Member] |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable prior year reserve development |  |  | 38,000 |
Professional Lines Reinsurance Business [Member] |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable prior year reserve development |  |  |  | $ 26,000

X
- Details
Name: | us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration