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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Additional Information Related to Net Incurred Losses [Line Items]      
Current year net loss and loss expenses $ 2,419,247 $ 2,445,666 $ 2,353,631
Net favorable (adverse) prior year reserve development 243,048 258,944 219,436
Short Tail Lines Insurance and Reinsurance Business [Member]      
Additional Information Related to Net Incurred Losses [Line Items]      
Net favorable (adverse) prior year reserve development 152,000 207,000 162,000
Professional Lines Reinsurance Business [Member]      
Additional Information Related to Net Incurred Losses [Line Items]      
Net favorable (adverse) prior year reserve development 38,000 33,000 22,000
Professional Lines Insurance Business [Member]      
Additional Information Related to Net Incurred Losses [Line Items]      
Net favorable (adverse) prior year reserve development (14,000)   (51,000)
Credit and Surety Business [Member]      
Additional Information Related to Net Incurred Losses [Line Items]      
Net favorable (adverse) prior year reserve development 27,000    
Credit and Political Risk Business [Member]      
Additional Information Related to Net Incurred Losses [Line Items]      
Net favorable (adverse) prior year reserve development (15,000)    
Liability and Motor Reinsurance Business [Member]      
Additional Information Related to Net Incurred Losses [Line Items]      
Net favorable (adverse) prior year reserve development 82,000 40,000 91,000
Liability Insurance Business [Member]      
Additional Information Related to Net Incurred Losses [Line Items]      
Net favorable (adverse) prior year reserve development (27,000) (23,000) (24,000)
Catastrophe and Weather-related Events [Member]      
Additional Information Related to Net Incurred Losses [Line Items]      
Current year net loss and loss expenses $ 100,000 $ 93,000 $ 201,000