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RESERVE FOR LOSSES AND LOSS EXPENSES - Reconciliation of development tables to consolidated balance sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Claims Development [Line Items]        
Net outstanding liabilities $ 8,862,564      
Reinsurance recoverable on unpaid claims 3,877,756      
Gross outstanding liabilities 12,740,320      
Unallocated claims adjustment expenses 140,650      
Foreign exchange and other 27,202      
(Ceded)/assumed reserves related to retroactive transactions (156,091)      
Reserve for losses and loss expenses 12,752,081 $ 12,280,769 $ 12,997,553 $ 9,697,827
Insurance        
Claims Development [Line Items]        
Net outstanding liabilities 3,534,458      
Reinsurance recoverable on unpaid claims 2,806,973      
Gross outstanding liabilities 6,341,431      
Insurance | Property and other        
Claims Development [Line Items]        
Net outstanding liabilities 579,613      
Reinsurance recoverable on unpaid claims 358,193      
Gross outstanding liabilities 937,806      
Insurance | Marine        
Claims Development [Line Items]        
Net outstanding liabilities 350,692      
Reinsurance recoverable on unpaid claims 164,005      
Gross outstanding liabilities 514,697      
Insurance | Aviation        
Claims Development [Line Items]        
Net outstanding liabilities 86,940      
Reinsurance recoverable on unpaid claims 36,094      
Gross outstanding liabilities 123,034      
Insurance | Credit and political risk        
Claims Development [Line Items]        
Net outstanding liabilities 98,219      
Reinsurance recoverable on unpaid claims 34,615      
Gross outstanding liabilities 132,834      
Insurance | Professional lines        
Claims Development [Line Items]        
Net outstanding liabilities 1,680,272      
Reinsurance recoverable on unpaid claims 1,105,684      
Gross outstanding liabilities 2,785,956      
Insurance | Liability        
Claims Development [Line Items]        
Net outstanding liabilities 738,722      
Reinsurance recoverable on unpaid claims 1,108,382      
Gross outstanding liabilities 1,847,104      
Reinsurance        
Claims Development [Line Items]        
Net outstanding liabilities 5,328,106      
Reinsurance recoverable on unpaid claims 1,070,783      
Gross outstanding liabilities 6,398,889      
Reinsurance | Property and other        
Claims Development [Line Items]        
Net outstanding liabilities 1,644,046      
Reinsurance recoverable on unpaid claims 448,885      
Gross outstanding liabilities 2,092,931      
Reinsurance | Credit and surety        
Claims Development [Line Items]        
Net outstanding liabilities 256,999      
Reinsurance recoverable on unpaid claims 64,475      
Gross outstanding liabilities 321,474      
Reinsurance | Professional lines        
Claims Development [Line Items]        
Net outstanding liabilities 969,167      
Reinsurance recoverable on unpaid claims 135,505      
Gross outstanding liabilities 1,104,672      
Reinsurance | Motor        
Claims Development [Line Items]        
Net outstanding liabilities 1,229,604      
Reinsurance recoverable on unpaid claims 209,495      
Gross outstanding liabilities 1,439,099      
Reinsurance | Liability        
Claims Development [Line Items]        
Net outstanding liabilities 1,228,290      
Reinsurance recoverable on unpaid claims 212,423      
Gross outstanding liabilities $ 1,440,713