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RESERVE FOR LOSSES AND LOSS EXPENSES (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Apr. 16, 2018 | Dec. 31, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |
Current year |  |  |  | $ 1,374,784 | $ 1,482,409 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | $ 3,152,706 | $ 3,564,812 | $ 3,152,706 | 3,564,812 | 3,152,706 | $ 3,501,669 | $ 108,000 | $ 3,159,514
Net favorable (adverse) prior year reserve development |  | 23,621 | 60,116 | 38,293 | 114,423 |  |  |
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 |  | (19,000) | 43,000 | (52,000) | 81,000 |  |  |
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 | 6,000 | 23,000 | 8,000 |  |  |
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 |  |  | 5,000 | 11,000 | 9,000 |  |  |
Catastrophe and Weather-related Events |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |
Current year |  |  |  | 36,000 | 73,000 |  |  |
Reinsurance |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  | 2,295 | 35,822 | 10,053 | 67,355 |  |  |
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 |  | (30,000) |  | (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 |  | 17,000 | 9,000 | 27,000 | 14,000 |  |  |
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 |  | 6,000 |  | 8,000 | 8,000 |  |  |
Insurance |  |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  | 21,326 | 24,294 | 28,240 | $ 47,068 |  |  |
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 |  | 6,000 |  | (16,000) |  |  |  |
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 | 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 |  | $ 4,000 |  | $ 10,000 |  |  |  |
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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