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COMMITMENTS AND CONTINGENCIES - Reinsurance purchase commitment and investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Unrecorded Unconditional Purchase Obligation [Line Items]    
Unfunded commitments related to other investments $ 507,000 $ 414,000
Purchase commitment 39,000  
Funds at Lloyd's 1,307,945 1,192,717
Collateral in Trust for third party agreements 1,510,416 2,085,443
CMBS    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Purchase commitment 4,000 16,000
Lloyd's    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Collateral in Trust for third party agreements $ 1,300,000 $ 1,200,000