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RESERVE FOR LOSSES AND LOSS EXPENSES (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 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 |  |  | $ 1,593,102 | $ 1,374,784 |  |
Reinsurance recoverable on unpaid losses and loss expenses (Allowance for expected credit losses 2020: $20,987) | $ 4,160,521 | $ 3,564,812 | 4,160,521 | 3,564,812 | $ 3,877,756 | $ 3,501,669
Net favorable (adverse) prior year reserve development | 2,655 | 23,621 | 8,767 | 38,293 |  |
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 | 22,000 | (19,000) | 32,000 | (52,000) |  |
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 | (21,000) | 23,000 |  |
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 | 4,000 |  | 18,000 | 11,000 |  |
Liability Insurance Business [Member] |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  | (17,000) | (21,000) |  |  |
Insurance |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net favorable (adverse) prior year reserve development | 420 | 21,326 | 4,251 | 28,240 |  |
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 | 25,000 | 6,000 | 37,000 | (16,000) |  |
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 |  | 5,000 |  | 22,000 |  |
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 | (9,000) | (4,000) | (14,000) | (10,000) |  |
Insurance | 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 |  | 7,000 |  | 9,000 |  |
Insurance | Aviation | 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 |  |  | 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 | 2,235 | 2,295 | 4,516 | 10,053 |  |
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) | (30,000) | (8,000) | (59,000) |  |
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 | 10,000 | 17,000 | 15,000 | 27,000 |  |
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) | $ 6,000 |  | 8,000 |  |
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 |  |  | $ 336,000 | $ 36,000 |  |

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