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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenue Recognition) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Disaggregation of Revenue [Line Items]        
Retained earnings $ 51,534 $ 100,683    
Revenues $ 928,987 1,386,079 $ 1,469,767  
Management Fees        
Disaggregation of Revenue [Line Items]        
Period to receive payment The Company’s right to receive management fees typically ends after 10 or 11 years from either the initial closing date or the start of the investment period, even if assets remain in the fund.      
Revenues $ 578,863 712,020 726,414  
Incentive Income, Closed-end        
Disaggregation of Revenue [Line Items]        
Revenues $ 334,287 651,021 701,065  
Preferred return on funds 20.00%      
Percentage of fund profits 8.00%      
Incentive Income, Evergreen        
Disaggregation of Revenue [Line Items]        
Revenues $ 15,837 23,038 42,288  
Preferred return on funds 20.00%      
Investment Income        
Disaggregation of Revenue [Line Items]        
Revenues $ 350,124 $ 674,059 $ 743,353  
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09        
Disaggregation of Revenue [Line Items]        
Retained earnings       $ 48,700