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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 8) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | $ 7,426,671 |  |  |
Reinsurance recoverable on unpaid claims | 2,276,109 |  |  |
Gross outstanding liabilities | 9,702,780 |  |  |
Unallocated claims adjustment expenses | 144,375 |  |  |
Foreign exchange and other | (59,988) |  |  |
(Ceded)/assumed reserves related to retroactive transactions | (89,340) |  |  |
Reserve for losses and loss expenses | 9,697,827 | $ 9,646,285 | $ 9,596,797 | $ 9,582,140
Insurance [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 3,212,646 |  |  |
Reinsurance recoverable on unpaid claims | 2,193,329 |  |  |
Gross outstanding liabilities | 5,405,975 |  |  |
Insurance [Member] | Property and Other Reserve Class [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 582,637 |  |  |
Reinsurance recoverable on unpaid claims | 169,707 |  |  |
Gross outstanding liabilities | 752,344 |  |  |
Insurance [Member] | Marine Reserve Class [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 253,308 |  |  |
Reinsurance recoverable on unpaid claims | 180,996 |  |  |
Gross outstanding liabilities | 434,304 |  |  |
Insurance [Member] | Aviation Reserve Class [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 54,550 |  |  |
Reinsurance recoverable on unpaid claims | 6,384 |  |  |
Gross outstanding liabilities | 60,934 |  |  |
Insurance [Member] | Credit and Political Risk Reserve Class [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 51,637 |  |  |
Reinsurance recoverable on unpaid claims | 154 |  |  |
Gross outstanding liabilities | 51,791 |  |  |
Insurance [Member] | Professional Lines Reserve Class [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,717,559 |  |  |
Reinsurance recoverable on unpaid claims | 998,873 |  |  |
Gross outstanding liabilities | 2,716,432 |  |  |
Insurance [Member] | Liability Reserve Class [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 552,955 |  |  |
Reinsurance recoverable on unpaid claims | 837,215 |  |  |
Gross outstanding liabilities | 1,390,170 |  |  |
Reinsurance [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 4,214,025 |  |  |
Reinsurance recoverable on unpaid claims | 82,780 |  |  |
Gross outstanding liabilities | 4,296,805 |  |  |
Reinsurance [Member] | Property and Other Reserve Class [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 823,463 |  |  |
Reinsurance recoverable on unpaid claims | 55,637 |  |  |
Gross outstanding liabilities | 879,100 |  |  |
Reinsurance [Member] | Credit and Surety Reserve Class [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 356,668 |  |  |
Reinsurance recoverable on unpaid claims | 1,916 |  |  |
Gross outstanding liabilities | 358,584 |  |  |
Reinsurance [Member] | Professional Lines Reserve Class [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,154,464 |  |  |
Reinsurance recoverable on unpaid claims | 8,353 |  |  |
Gross outstanding liabilities | 1,162,817 |  |  |
Reinsurance [Member] | Motor Reserve Class [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 811,156 |  |  |
Reinsurance recoverable on unpaid claims | 0 |  |  |
Gross outstanding liabilities | 811,156 |  |  |
Reinsurance [Member] | Liability Reserve Class [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,068,274 |  |  |
Reinsurance recoverable on unpaid claims | 16,874 |  |  |
Gross outstanding liabilities | $ 1,085,148 |  |  |

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