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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net Favorable Prior Year Reserve Development [Line Items]      
Net favorable prior year reserve development $ 243,048 $ 258,944 $ 219,436
Insurance [Member]      
Net Favorable Prior Year Reserve Development [Line Items]      
Net favorable prior year reserve development 23,447 63,735 50,355
Reinsurance [Member]      
Net Favorable Prior Year Reserve Development [Line Items]      
Net favorable prior year reserve development $ 219,601 $ 195,209 $ 169,081