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RESERVE FOR LOSSES AND LOSS EXPENSES (Narrative) (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Feb. 13, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Mar. 20, 2017 | Mar. 19, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Current year |  |  | $ 715,652 | $ 631,735 |  |  |
Insurance and reinsurance balances payable |  |  | 1,251,629 |  | $ 899,064 |  |
Net favorable (adverse) prior year reserve development |  |  | 54,307 | 24,793 |  |  |
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 |  |  | 38,000 | 4,000 |  |  |
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 | 0 |  |  |
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 |  |  | 2,000 | 24,000 |  |  |
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 |  |  | 3,000 | (22,000) |  |  |
Catastrophe and Weather-related Events |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Current year |  |  | 35,000 | 35,000 |  |  |
Discontinued Operations, Disposed of by Means Other than Sale |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Liability for unpaid claims and claims adjustment expense |  | $ 223,000 |  |  |  |  |
Reduction in reinsurance recoverables on unpaid and paid loses by |  | $ 223,000 |  |  |  |  |
Motor Reserve Class |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Ogden rate |  |  |  |  |  | (0.75%) | 2.50%
Reinsurance |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  |  | 31,532 | 16,928 |  |  |
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 | 16,000 |  |  |
Insurance |  |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Net favorable (adverse) prior year reserve development |  |  | 22,775 | 7,865 |  |  |
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 | 7,000 |  |  |
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 | $ 4,000 |  |  |
Novae 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 |  |  |  |  |  |
Consideration transferred reinsurance |  |  | 688,000 |  |  |  |
Insurance and reinsurance balances payable |  |  | $ 131,000 |  |  |  |

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