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