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INVESTMENT IN RELATED PARTY INVESTMENT FUND Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]      
GLRE Limited Partners’ share of net income (loss) $ (42,126) $ 30,756  
General Partner      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 19.70%   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 $ 189,900   $ 240,100
Equity method investment, ownership percentage 80.30%   81.00%