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INVESTMENT IN RELATED PARTY INVESTMENT FUND Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]          
GLRE Limited Partners’ share of net income (loss) $ 1,609 $ 14,405 $ (40,517) $ 45,161  
General Partner          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 20.90%   20.90%   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]          
Equity method investments, fair value $ 177,700   $ 177,700   $ 240,100
Equity method investment, ownership percentage 79.10%   79.10%   81.00%