INVESTMENTS (DETAILS 12) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Restricted Investments [Line Items]
Collateral in Trust for inter-company agreements	$ 2,792,776	$ 2,766,453
Collateral for secured letter of credit facility	445,482	481,023
Collateral in Trust for third party agreements	777,076	551,985
Securities on deposit with regulatory authorities	50,005	57,597
Total restricted investments	4,065,339	3,857,058
Lloyd's [Member]
Restricted Investments [Line Items]
Collateral in Trust for third party agreements	$ 376,000	$ 232,000