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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 4) - USD ($) $ in Thousands | 12 Months Ended
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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

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