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INVESTMENTS - Investment Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]        
Other investments, at fair value $ (3,112) $ (4,310) $ 3,581 $ (8,477)
Total investment income (loss) 60,540 67,407 173,779 (42,266)
Funds        
Schedule of Equity Method Investments [Line Items]        
Equity-method investments: 63,689 71,523 170,213 (34,111)
Companies        
Schedule of Equity Method Investments [Line Items]        
Equity-method investments: $ (37) $ 194 $ (15) $ 322