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INVESTMENT IN RELATED PARTY INVESTMENT FUND Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Aug. 05, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]            
GLRE Limited Partners’ share of net income (loss) $ 6,431 $ 6,609 $ (34,086) $ 51,770    
General Partner            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage 19.00%   19.00%     19.00%
SILP            
Schedule of Equity Method Investments [Line Items]            
Asset redemption notice to general partner     3 days      
SILP | Greenlight Capital Re Limited Partners            
Schedule of Equity Method Investments [Line Items]            
Investment portfolio percent of shareholders equity maximum         50.00%  
Equity method investments, fair value $ 185,000   $ 185,000     $ 240,100
Equity method investment, ownership percentage 81.00%   81.00%     81.00%