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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 2) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net Favorable Prior Year Reserve Development [Line Items]        
Net favorable prior year reserve development $ 45,125 $ 64,538 $ 165,804 $ 193,385
Insurance [Member]        
Net Favorable Prior Year Reserve Development [Line Items]        
Net favorable prior year reserve development 2,444 9,488 21,225 54,059
Reinsurance [Member]        
Net Favorable Prior Year Reserve Development [Line Items]        
Net favorable prior year reserve development $ 42,681 $ 55,050 $ 144,579 $ 139,326