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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 3) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | $ 45,125 | $ 64,538 | $ 165,804 | $ 193,385
Short Tail Lines Insurance And Reinsurance Business [Member] |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 38,000 | 61,000 | 112,000 | 162,000
Professional Lines Reinsurance Business [Member] |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 1,000 | 10,000 | 25,000 | 22,000
Professional Lines Insurance Business [Member] |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | (15,000) |  | (16,000) |
Credit and Surety Business [Member] |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 7,000 |  | 19,000 |
Credit And Political Risk Insurance 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 | 20,000 | 8,000 | 64,000 | 19,000
Liability Insurance Business [Member] |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | $ (6,000) | $ (14,000) | $ (23,000) | $ (14,000)

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