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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable prior year reserve development	$ 43,493	$ 54,499
Short Tail Lines Insurance And Reinsurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable prior year reserve development	29,000	30,000
Liability Reinsurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable prior year reserve development	6,000	16,000
Professional Lines Reinsurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable prior year reserve development	6,000	8,000
Credit And Surety Reinsurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable prior year reserve development		$ 10,000

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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

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