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RESERVE FOR LOSSES AND LOSS EXPENSES (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Net loss and loss expenses |  |  | $ 2,473,363 | $ 2,252,424
Net favorable (adverse) prior year reserve development | $ 584 | $ 26,727 | 9,351 | 65,021
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 | 14,000 | 2,000 | 44,000 | (50,000)
Insurance |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 270 | 14,609 | 4,521 | 42,849
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 | 7,000 | 11,000 | 43,000 | (4,000)
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 | 4,000 |  |  | 24,000
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 | (7,000) | 4,000 | (19,000) | 14,000
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 |  |  |  | 10,000
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 |
Insurance | Marine And Aviation 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 |  | 3,000 |  |
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 | (4,000) | (4,000) | (25,000) |
Reinsurance |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 314 | 12,118 | 4,830 | 22,172
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 | 3,000 | (12,000) | (5,000) | (71,000)
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 | 11,000 | 6,000 | 28,000 | 33,000
Reinsurance | 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 |  | 23,000 | 19,000 | 34,000
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 | $ (14,000) | $ (7,000) | (13,000) |
Reinsurance | 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 |  |  | (23,000) | 26,000
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 |  |  | $ 576,000 | $ 206,000

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