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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable (adverse) prior year reserve development	$ 64,613	$ 85,354	$ 120,679	$ 128,847
Short Tail Lines Insurance And Reinsurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable (adverse) prior year reserve development	40,000	73,000	74,000	101,000
Professional Lines Reinsurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable (adverse) prior year reserve development	4,000	6,000	24,000	12,000
Credit And Political Risk Insurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable (adverse) prior year reserve development			(15,000)
Liability and Motor Reinsurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable (adverse) prior year reserve development	25,000	$ 6,000	44,000	$ 12,000
Liability Insurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable (adverse) prior year reserve development	$ (6,000)		$ (17,000)

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Amount of expense for claims incurred in prior reporting periods and related claims settlement costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 235



-Section S99



-Paragraph 3



-Subparagraph (SX 210.12-18)



-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 18



-Article 12

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