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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