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RESERVE FOR LOSSES AND LOSS EXPENSES (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Current year |  | $ 678,700 | $ 715,652
Net favorable (adverse) prior year reserve development |  | 14,672 | 54,307
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 |  | (33,000) | 37,000
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 | 6,000
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 |  | 12,000 | 2,000
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 |  | 12,000 | 3,000
Catastrophe and Weather-related Events |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Current year |  | 11,000 | 35,000
Reinsurance |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Net favorable (adverse) prior year reserve development |  | 7,759 | 31,532
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 |  | (29,000) |
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 |  |  | 9,000
Insurance |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Net favorable (adverse) prior year reserve development |  | 6,913 | 22,775
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 |  | (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 |  | $ 6,000 | 4,000
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 |  |  | $ (7,000)
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 |  |

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