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INVESTMENTS - Restricted assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Restricted Investments [Line Items]    
Collateral in Trust for third party agreements $ 2,085,443 $ 508,262
Collateral in Trust for inter-company agreements 3,310,180 2,877,823
Collateral for secured letter of credit facility 386,451 448,366
Funds at Lloyd's 1,192,717 382,611
Collateral in Trust for third party agreements 2,085,443 508,262
Securities on deposit with regulatory authorities 53,925 50,290
Total restricted investments 7,028,716 4,267,352
Lloyd's    
Restricted Investments [Line Items]    
Collateral in Trust for third party agreements 1,200,000 383,000
Collateral in Trust for third party agreements 1,200,000 383,000
Syndicate 2007    
Restricted Investments [Line Items]    
Collateral in Trust for third party agreements 1,120,000  
Pledged cash for third party insurance and reinsurance agreements 55,000  
Collateral in Trust for third party agreements 1,120,000  
Syndicate 1686    
Restricted Investments [Line Items]    
Pledged cash for third party insurance and reinsurance agreements $ 140,000 $ 84,000