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RESERVE FOR LOSSES AND LOSS EXPENSES (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 13, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Apr. 16, 2018 | Dec. 31, 2017 | Apr. 01, 2017 | Mar. 20, 2017 | Mar. 19, 2017 | Dec. 31, 2016
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current year |  |  |  | $ 2,323,028 | $ 2,591,135 |  |  |  |  |  |
Reinsurance recoverable on unpaid losses |  | $ 3,217,787 | $ 2,298,022 | 3,217,787 | 2,298,022 | $ 108,000 | $ 3,159,514 |  |  |  | $ 2,276,109
Reinsurance recoverable on unpaid and paid losses |  | 3,439,080 |  | 3,439,080 |  |  | $ 3,338,840 |  |  |  |
Net favorable (adverse) prior year reserve development |  | 45,660 | 47,768 | 160,083 | 143,495 |  |  |  |  |  |
Short Tail Reserving Class Insurance And Reinsurance Business |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  | 12,000 | 5,000 | 92,000 | 41,000 |  |  |  |  |  |
Reinsurance Credit and Surety |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  | 6,000 | 17,000 | 21,000 | 18,000 |  |  |  |  |  |
Liability Reinsurance Business |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  | 11,000 |  | 19,000 | 40,000 |  |  |  |  |  |
Motor Reinsurance Business |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  | 7,000 | 16,000 | 15,000 | (4,000) |  |  |  |  |  |
Catastrophe and Weather-related Events |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current year |  |  |  | 162,000 | 702,000 |  |  |  |  |  |
Discontinued Operations, Disposed of by Means Other than Sale |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Liability for unpaid claims and claims adjustment expense | $ 223,000 |  |  |  |  |  |  |  |  |  |
Reduction in reinsurance recoverables on unpaid and paid loses by | $ 223,000 |  |  |  |  |  |  |  |  |  |
Motor Reserve Class |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ogden rate |  |  |  |  |  |  |  |  | (0.75%) | 2.50% |
Reinsurance |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  | 32,182 | 39,842 | 99,536 | 107,916 |  |  |  |  |  |
Reinsurance | Professional Lines |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  | 10,000 | 9,000 | 18,000 | 36,000 |  |  |  |  |  |
Insurance |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  | 13,478 | 7,926 | 60,547 | 35,579 |  |  |  |  |  |
Insurance | Professional Lines |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  | 10,000 |  | 12,000 | 18,000 |  |  |  |  |  |
Insurance | Liability Insurance Business |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  | $ (11,000) |  | (18,000) | (6,000) |  |  |  |  |  |
Syndicate 2007 |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Policyholder benefits and claims incurred, assumed and ceded |  |  |  | $ 819,000 |  |  |  |  |  |  |
Aviabel |  |  |  |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interests acquired |  |  |  |  |  |  |  | 100.00% |  |  |
Reserves of businesses acquired |  |  | 79,000 |  | 79,000 |  |  |  |  |  |
Reinsurance recoverable on unpaid and paid losses |  |  | $ 5,000 |  | $ 5,000 |  |  |  |  |  |

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