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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 2) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net Favorable Prior Year Reserve Development [Line Items]        
Net favorable prior year reserve development $ 77,719 $ 64,613 $ 148,113 $ 120,679
Insurance [Member]        
Net Favorable Prior Year Reserve Development [Line Items]        
Net favorable prior year reserve development 20,066 15,421 22,493 18,783
Reinsurance [Member]        
Net Favorable Prior Year Reserve Development [Line Items]        
Net favorable prior year reserve development $ 57,653 $ 49,192 $ 125,620 $ 101,896