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INVESTMENTS (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Schedule of Investments [Line Items]          
Loss from other than temporary impairment equity investments $ 0 $ 0 $ 0 $ 0  
Equity method investments, at fair value 9,589,000   9,589,000   $ 11,650,000
Performance fees     800,000   900,000
Consolidated Subsidiaries | Reported Value Measurement          
Schedule of Investments [Line Items]          
Equity method investments, at fair value         200,000
Consolidated Subsidiaries | Senior Notes | Reported Value Measurement          
Schedule of Investments [Line Items]          
Investments of consolidated fund         1,300,000
Sierra Income Corporation          
Schedule of Investments [Line Items]          
Equity method investments, at fair value 5,400,000   5,400,000   $ 6,400,000
CK Pearl Fund          
Schedule of Investments [Line Items]          
Investment held at cost impairment $ 0 $ 0 $ (100,000) $ 0