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SEGMENT INFORMATION (DETAILS 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues From External Customers By Geographic Location Of Subsidiary [Line Items]
Gross premiums written	$ 4,711,519us-gaap_PremiumsWrittenGross	$ 4,697,041us-gaap_PremiumsWrittenGross	$ 4,139,643us-gaap_PremiumsWrittenGross
Bermuda [Member]
Revenues From External Customers By Geographic Location Of Subsidiary [Line Items]
Gross premiums written	618,273us-gaap_PremiumsWrittenGross / us-gaap_StatementGeographicalAxis = country_BM	718,904us-gaap_PremiumsWrittenGross / us-gaap_StatementGeographicalAxis = country_BM	684,588us-gaap_PremiumsWrittenGross / us-gaap_StatementGeographicalAxis = country_BM
Europe [Member]
Revenues From External Customers By Geographic Location Of Subsidiary [Line Items]
Gross premiums written	1,784,139us-gaap_PremiumsWrittenGross / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	1,699,748us-gaap_PremiumsWrittenGross / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	1,561,701us-gaap_PremiumsWrittenGross / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
United States [Member]
Revenues From External Customers By Geographic Location Of Subsidiary [Line Items]
Gross premiums written	$ 2,309,107us-gaap_PremiumsWrittenGross / us-gaap_StatementGeographicalAxis = country_US	$ 2,278,389us-gaap_PremiumsWrittenGross / us-gaap_StatementGeographicalAxis = country_US	$ 1,893,354us-gaap_PremiumsWrittenGross / us-gaap_StatementGeographicalAxis = country_US

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- Definition

Amount of direct and assumed premiums written.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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