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RESERVE FOR LOSSES AND LOSS EXPENSES - Reconciliation of development tables to consolidated balance sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Claims Development [Line Items]        
Net outstanding liabilities $ 9,392,938      
Reinsurance recoverable on unpaid claims 4,496,641      
Gross outstanding liabilities 13,889,579      
Unallocated claims adjustment expenses 140,245      
Foreign exchange and other 49,072      
(Ceded)/assumed reserves related to retroactive transactions (152,130)      
Reserve for losses and loss expenses 13,926,766 $ 12,752,081 $ 12,280,769 $ 12,997,553
Insurance        
Claims Development [Line Items]        
Net outstanding liabilities 3,937,283      
Reinsurance recoverable on unpaid claims 3,196,367      
Gross outstanding liabilities 7,133,650      
Insurance | Property and other        
Claims Development [Line Items]        
Net outstanding liabilities 794,903      
Reinsurance recoverable on unpaid claims 508,225      
Gross outstanding liabilities 1,303,128      
Insurance | Marine        
Claims Development [Line Items]        
Net outstanding liabilities 362,631      
Reinsurance recoverable on unpaid claims 162,396      
Gross outstanding liabilities 525,027      
Insurance | Aviation        
Claims Development [Line Items]        
Net outstanding liabilities 84,024      
Reinsurance recoverable on unpaid claims 64,252      
Gross outstanding liabilities 148,276      
Insurance | Credit and political risk        
Claims Development [Line Items]        
Net outstanding liabilities 106,644      
Reinsurance recoverable on unpaid claims 51,667      
Gross outstanding liabilities 158,311      
Insurance | Professional lines        
Claims Development [Line Items]        
Net outstanding liabilities 1,786,152      
Reinsurance recoverable on unpaid claims 1,227,183      
Gross outstanding liabilities 3,013,335      
Insurance | Liability        
Claims Development [Line Items]        
Net outstanding liabilities 802,929      
Reinsurance recoverable on unpaid claims 1,182,644      
Gross outstanding liabilities 1,985,573      
Reinsurance        
Claims Development [Line Items]        
Net outstanding liabilities 5,455,655      
Reinsurance recoverable on unpaid claims 1,300,274      
Gross outstanding liabilities 6,755,929      
Reinsurance | Property and other        
Claims Development [Line Items]        
Net outstanding liabilities 1,640,017      
Reinsurance recoverable on unpaid claims 497,211      
Gross outstanding liabilities 2,137,228      
Reinsurance | Credit and surety        
Claims Development [Line Items]        
Net outstanding liabilities 243,609      
Reinsurance recoverable on unpaid claims 70,143      
Gross outstanding liabilities 313,752      
Reinsurance | Professional lines        
Claims Development [Line Items]        
Net outstanding liabilities 990,567      
Reinsurance recoverable on unpaid claims 186,245      
Gross outstanding liabilities 1,176,812      
Reinsurance | Motor        
Claims Development [Line Items]        
Net outstanding liabilities 1,261,241      
Reinsurance recoverable on unpaid claims 228,453      
Gross outstanding liabilities 1,489,694      
Reinsurance | Liability        
Claims Development [Line Items]        
Net outstanding liabilities 1,320,221      
Reinsurance recoverable on unpaid claims 318,222      
Gross outstanding liabilities $ 1,638,443