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RESERVE FOR LOSSES AND LOSS EXPENSES - Reconciliation of development tables to consolidated balance sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Claims Development [Line Items]        
Net outstanding liabilities $ 9,576,302      
Reinsurance recoverable on unpaid claims 5,017,611 $ 4,496,641 $ 3,877,756 $ 3,501,669
Gross outstanding liabilities 14,593,913      
Unallocated claims adjustment expenses 159,676      
Foreign exchange and other 48,373      
Ceded reserves related to retroactive transactions (148,868)      
Reserve for losses and loss expenses 14,653,094 $ 13,926,766 $ 12,752,081 $ 12,280,769
Insurance        
Claims Development [Line Items]        
Net outstanding liabilities 4,178,193      
Reinsurance recoverable on unpaid claims 3,451,041      
Gross outstanding liabilities 7,629,234      
Insurance | Property and other        
Claims Development [Line Items]        
Net outstanding liabilities 688,786      
Reinsurance recoverable on unpaid claims 417,814      
Gross outstanding liabilities 1,106,600      
Insurance | Marine        
Claims Development [Line Items]        
Net outstanding liabilities 430,468      
Reinsurance recoverable on unpaid claims 182,584      
Gross outstanding liabilities 613,052      
Insurance | Aviation        
Claims Development [Line Items]        
Net outstanding liabilities 88,203      
Reinsurance recoverable on unpaid claims 58,067      
Gross outstanding liabilities 146,270      
Insurance | Credit and political risk        
Claims Development [Line Items]        
Net outstanding liabilities 58,982      
Reinsurance recoverable on unpaid claims (23,381)      
Gross outstanding liabilities 35,601      
Insurance | Professional lines        
Claims Development [Line Items]        
Net outstanding liabilities 2,009,370      
Reinsurance recoverable on unpaid claims 1,494,488      
Gross outstanding liabilities 3,503,858      
Insurance | Liability        
Claims Development [Line Items]        
Net outstanding liabilities 902,384      
Reinsurance recoverable on unpaid claims 1,321,469      
Gross outstanding liabilities 2,223,853      
Reinsurance        
Claims Development [Line Items]        
Net outstanding liabilities 5,398,109      
Reinsurance recoverable on unpaid claims 1,566,570      
Gross outstanding liabilities 6,964,679      
Reinsurance | Property and other        
Claims Development [Line Items]        
Net outstanding liabilities 1,652,950      
Reinsurance recoverable on unpaid claims 584,201      
Gross outstanding liabilities 2,237,151      
Reinsurance | Credit and surety        
Claims Development [Line Items]        
Net outstanding liabilities 249,302      
Reinsurance recoverable on unpaid claims 66,965      
Gross outstanding liabilities 316,267      
Reinsurance | Professional lines        
Claims Development [Line Items]        
Net outstanding liabilities 968,664      
Reinsurance recoverable on unpaid claims 251,341      
Gross outstanding liabilities 1,220,005      
Reinsurance | Motor        
Claims Development [Line Items]        
Net outstanding liabilities 1,124,575      
Reinsurance recoverable on unpaid claims 229,195      
Gross outstanding liabilities 1,353,770      
Reinsurance | Liability        
Claims Development [Line Items]        
Net outstanding liabilities 1,402,618      
Reinsurance recoverable on unpaid claims 434,868      
Gross outstanding liabilities $ 1,837,486