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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 2) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net Favorable Prior Year Reserve Development [Line Items]        
Net favorable prior year reserve development $ 76,019 $ 45,125 $ 224,131 $ 165,804
Insurance [Member]        
Net Favorable Prior Year Reserve Development [Line Items]        
Net favorable prior year reserve development 20,688 2,444 43,181 21,225
Reinsurance [Member]        
Net Favorable Prior Year Reserve Development [Line Items]        
Net favorable prior year reserve development $ 55,331 $ 42,681 $ 180,950 $ 144,579