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SEGMENT INFORMATION (DETAILS 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues From External Customers By Geographic Location Of Subsidiary [Line Items]      
Gross premiums written $ 4,603,730 $ 4,711,519 $ 4,697,041
Bermuda [Member]      
Revenues From External Customers By Geographic Location Of Subsidiary [Line Items]      
Gross premiums written 525,226 618,273 718,904
Europe [Member]      
Revenues From External Customers By Geographic Location Of Subsidiary [Line Items]      
Gross premiums written 1,714,405 1,784,139 1,699,748
United States [Member]      
Revenues From External Customers By Geographic Location Of Subsidiary [Line Items]      
Gross premiums written $ 2,364,099 $ 2,309,107 $ 2,278,389