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RESERVE FOR LOSSES AND LOSS EXPENSES - Reconciliation of development tables to consolidated balance sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | $ 8,862,564 |  |  |
Reinsurance recoverable on unpaid claims | 3,877,756 |  |  |
Gross outstanding liabilities | 12,740,320 |  |  |
Unallocated claims adjustment expenses | 140,650 |  |  |
Foreign exchange and other | 27,202 |  |  |
(Ceded)/assumed reserves related to retroactive transactions | (156,091) |  |  |
Reserve for losses and loss expenses | 12,752,081 | $ 12,280,769 | $ 12,997,553 | $ 9,697,827
Insurance |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 3,534,458 |  |  |
Reinsurance recoverable on unpaid claims | 2,806,973 |  |  |
Gross outstanding liabilities | 6,341,431 |  |  |
Insurance | Property and other |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 579,613 |  |  |
Reinsurance recoverable on unpaid claims | 358,193 |  |  |
Gross outstanding liabilities | 937,806 |  |  |
Insurance | Marine |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 350,692 |  |  |
Reinsurance recoverable on unpaid claims | 164,005 |  |  |
Gross outstanding liabilities | 514,697 |  |  |
Insurance | Aviation |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 86,940 |  |  |
Reinsurance recoverable on unpaid claims | 36,094 |  |  |
Gross outstanding liabilities | 123,034 |  |  |
Insurance | Credit and political risk |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 98,219 |  |  |
Reinsurance recoverable on unpaid claims | 34,615 |  |  |
Gross outstanding liabilities | 132,834 |  |  |
Insurance | Professional lines |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,680,272 |  |  |
Reinsurance recoverable on unpaid claims | 1,105,684 |  |  |
Gross outstanding liabilities | 2,785,956 |  |  |
Insurance | Liability |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 738,722 |  |  |
Reinsurance recoverable on unpaid claims | 1,108,382 |  |  |
Gross outstanding liabilities | 1,847,104 |  |  |
Reinsurance |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 5,328,106 |  |  |
Reinsurance recoverable on unpaid claims | 1,070,783 |  |  |
Gross outstanding liabilities | 6,398,889 |  |  |
Reinsurance | Property and other |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,644,046 |  |  |
Reinsurance recoverable on unpaid claims | 448,885 |  |  |
Gross outstanding liabilities | 2,092,931 |  |  |
Reinsurance | Credit and surety |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 256,999 |  |  |
Reinsurance recoverable on unpaid claims | 64,475 |  |  |
Gross outstanding liabilities | 321,474 |  |  |
Reinsurance | Professional lines |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 969,167 |  |  |
Reinsurance recoverable on unpaid claims | 135,505 |  |  |
Gross outstanding liabilities | 1,104,672 |  |  |
Reinsurance | Motor |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,229,604 |  |  |
Reinsurance recoverable on unpaid claims | 209,495 |  |  |
Gross outstanding liabilities | 1,439,099 |  |  |
Reinsurance | Liability |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,228,290 |  |  |
Reinsurance recoverable on unpaid claims | 212,423 |  |  |
Gross outstanding liabilities | $ 1,440,713 |  |  |

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