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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 2) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net Favorable Prior Year Reserve Development [Line Items]    
Net favorable prior year reserve development $ 70,394 $ 56,066
Insurance [Member]    
Net Favorable Prior Year Reserve Development [Line Items]    
Net favorable prior year reserve development 2,427 3,361
Reinsurance [Member]    
Net Favorable Prior Year Reserve Development [Line Items]    
Net favorable prior year reserve development $ 67,967 $ 52,705