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RESERVE FOR LOSSES AND LOSS EXPENSES (Details 2) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2017 | Feb. 13, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 20, 2017 | Mar. 19, 2017 | Dec. 31, 2016
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |  |  |  |  |  |
Current year |  |  |  |  | $ 2,591,135 | $ 1,887,715 |  |  |
Net favorable (adverse) prior year reserve development |  |  | $ 47,768 | $ 76,019 | 143,495 | 224,131 |  |  |
Reinsurance recoverable on unpaid and paid losses |  |  | 2,360,821 |  | 2,360,821 |  |  |  | $ 2,334,922
Short Tail Lines Insurance And Reinsurance Business [Member] |  |  |  |  |  |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  |  | 5,000 | 41,000 | 41,000 | 116,000 |  |  |
Professional Lines Insurance And Reinsurance Business [Member] |  |  |  |  |  |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  |  | 9,000 | 12,000 | 54,000 | 28,000 |  |  |
Reinsurance Credit and Surety [Member] |  |  |  |  |  |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  |  | 17,000 |  | 18,000 |  |  |  |
Liability Reinsurance Business [Member] |  |  |  |  |  |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  |  |  | 10,000 | 40,000 | 32,000 |  |  |
Liability Insurance Business [Member] |  |  |  |  |  |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  |  |  |  | (6,000) |  |  |  |
Motor Reinsurance Business [Member] |  |  |  |  |  |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  |  | $ 16,000 | $ 7,000 | (4,000) | 40,000 |  |  |
Ogden rate |  |  |  |  |  |  | (0.75%) | 2.50% |
Catastrophe and Weather-related Events [Member] |  |  |  |  |  |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |  |  |  |  |  |
Current year |  |  |  |  | $ 702,000 | $ 145,000 |  |  |
Discontinued Operations, Disposed of by Means Other than Sale [Member] |  |  |  |  |  |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |  |  |  |  |  |
Liability for unpaid claims and claims adjustment expense |  | $ 223,000 |  |  |  |  |  |  |
Reduction in reinsurance recoverables on unpaid and paid loses by |  | $ 223,000 |  |  |  |  |  |  |
Compagnie Belge d'Assurances Aviation NV/SA [Member] |  |  |  |  |  |  |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |  |  |  |  |  |  |
Interests acquired | 100.00% |  |  |  |  |  |  |  |
Reserves of businesses acquired | $ 79,000 |  |  |  |  |  |  |  |
Reinsurance recoverable on unpaid and paid losses | $ 5,000 |  |  |  |  |  |  |  |

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