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COMMITMENTS AND CONTINGENCIES - Reinsurance purchase commitment, investments and funds at Lloyd's (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Unrecorded Unconditional Purchase Obligation [Line Items]      
Purchase commitment   $ 57,000 $ 39,000
Unfunded commitments related to other investments   588,000 507,000
Collateral in Trust for third party agreements   $ 1,856,327 1,510,416
Axis Corporate Capital UK Limited      
Unrecorded Unconditional Purchase Obligation [Line Items]      
Capital support, percentage 70.00% 70.00%  
Axis Corporate Capital UK Limited II      
Unrecorded Unconditional Purchase Obligation [Line Items]      
Capital support, percentage 30.00% 30.00%  
CMBS      
Unrecorded Unconditional Purchase Obligation [Line Items]      
Purchase commitment   $ 32,000 4,000
Lloyd's      
Unrecorded Unconditional Purchase Obligation [Line Items]      
Collateral in Trust for third party agreements   $ 1,300,000 $ 1,300,000