SEGMENT INFORMATION (DETAILS 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues From External Customers By Geographic Location Of Subsidiary [Line Items]
Gross premiums written	$ 4,697,041	$ 4,139,643	$ 4,096,153
Bermuda [Member]
Revenues From External Customers By Geographic Location Of Subsidiary [Line Items]
Gross premiums written	718,904	684,588	822,237
Europe [Member]
Revenues From External Customers By Geographic Location Of Subsidiary [Line Items]
Gross premiums written	1,699,748	1,561,701	1,493,692
United States [Member]
Revenues From External Customers By Geographic Location Of Subsidiary [Line Items]
Gross premiums written	$ 2,278,389	$ 1,893,354	$ 1,780,224