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RESERVE FOR LOSSES AND LOSS EXPENSES (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Net loss and loss expenses | $ 914,186 | $ 678,700 |  |
Reinsurance recoverable on unpaid losses and loss expenses (Allowance for expected credit losses 2020: $18,954) | 4,101,579 | 3,555,341 | $ 3,877,756 | $ 3,501,669
Net favorable (adverse) prior year reserve development | 6,113 | 14,672 |  |
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 | 10,000 | (33,000) |  |
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 | (17,000) | 12,000 |  |
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 | 13,000 | 12,000 |  |
Insurance |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 3,832 | 6,913 |  |
Insurance | 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 | 13,000 | (22,000) |  |
Insurance | Marine | 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 |  | 16,000 |  |
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 | (5,000) | 6,000 |  |
Reinsurance |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 2,281 | 7,759 |  |
Reinsurance | 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 | (4,000) | (29,000) |  |
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 | 5,000 | 10,000 |  |
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 | 5,000 |  |  |
Catastrophe and Weather-related Events |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Net loss and loss expenses | 300,000 | $ 11,000 |  |
Pandemic |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Net loss and loss expenses | 235,000 |  |  |
Weather |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Net loss and loss expenses | $ 65,000 |  |  |

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