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RESERVE FOR LOSSES AND LOSS EXPENSES - Reconciliation of development tables to consolidated balance sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | $ 9,654,715 |  |  |
Reinsurance recoverable on unpaid claims | 3,159,514 |  |  |
Gross outstanding liabilities | 12,814,229 |  |  |
Unallocated claims adjustment expenses | 170,168 |  |  |
Foreign exchange and other | (45,262) |  |  |
Assumed reserves related to retroactive transactions | 58,418 |  |  |
Reserve for losses and loss expenses | 12,997,553 | $ 9,697,827 | $ 9,646,285 | $ 9,596,797
Aviabel |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 77,405 |  |  |
Reinsurance recoverable on unpaid claims | 5,329 |  |  |
Gross outstanding liabilities | 82,734 |  |  |
Novae |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,300,361 |  |  |
Reinsurance recoverable on unpaid claims | 771,258 |  |  |
Gross outstanding liabilities | 2,071,619 |  |  |
Insurance |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 3,331,536 |  |  |
Reinsurance recoverable on unpaid claims | 2,047,292 |  |  |
Gross outstanding liabilities | 5,378,828 |  |  |
Insurance | Property and Other |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 880,954 |  |  |
Reinsurance recoverable on unpaid claims | 181,101 |  |  |
Gross outstanding liabilities | 1,062,055 |  |  |
Insurance | Marine |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 213,390 |  |  |
Reinsurance recoverable on unpaid claims | 106,466 |  |  |
Gross outstanding liabilities | 319,856 |  |  |
Insurance | Aviation |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 56,400 |  |  |
Reinsurance recoverable on unpaid claims | 8,945 |  |  |
Gross outstanding liabilities | 65,345 |  |  |
Insurance | Credit and Political Risk |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 51,469 |  |  |
Reinsurance recoverable on unpaid claims | 1,384 |  |  |
Gross outstanding liabilities | 52,853 |  |  |
Insurance | Professional Lines |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,559,564 |  |  |
Reinsurance recoverable on unpaid claims | 853,130 |  |  |
Gross outstanding liabilities | 2,412,694 |  |  |
Insurance | Liability |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 569,759 |  |  |
Reinsurance recoverable on unpaid claims | 896,266 |  |  |
Gross outstanding liabilities | 1,466,025 |  |  |
Reinsurance |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 4,945,413 |  |  |
Reinsurance recoverable on unpaid claims | 335,635 |  |  |
Gross outstanding liabilities | 5,281,048 |  |  |
Reinsurance | Property and Other |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,220,069 |  |  |
Reinsurance recoverable on unpaid claims | 214,394 |  |  |
Gross outstanding liabilities | 1,434,463 |  |  |
Reinsurance | Credit and Surety |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 375,762 |  |  |
Reinsurance recoverable on unpaid claims | 13,061 |  |  |
Gross outstanding liabilities | 388,823 |  |  |
Reinsurance | Professional Lines |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,119,534 |  |  |
Reinsurance recoverable on unpaid claims | 37,822 |  |  |
Gross outstanding liabilities | 1,157,356 |  |  |
Reinsurance | Motor |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,082,423 |  |  |
Reinsurance recoverable on unpaid claims | 3,666 |  |  |
Gross outstanding liabilities | 1,086,089 |  |  |
Reinsurance | Liability |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,147,625 |  |  |
Reinsurance recoverable on unpaid claims | 66,692 |  |  |
Gross outstanding liabilities | $ 1,214,317 |  |  |

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