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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 2) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net Favorable Prior Year Reserve Development [Line Items]        
Net favorable prior year reserve development $ 64,613 $ 85,354 $ 120,679 $ 128,847
Insurance [Member]        
Net Favorable Prior Year Reserve Development [Line Items]        
Net favorable prior year reserve development 15,421 32,963 18,783 44,571
Reinsurance [Member]        
Net Favorable Prior Year Reserve Development [Line Items]        
Net favorable prior year reserve development $ 49,192 $ 52,391 $ 101,896 $ 84,276