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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