DEBT - Loan Obligations of the Consolidated CLOs (Details) - Consolidated Funds - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
DEBT
Fair Value of Loan Obligations	$ 10,174,794	$ 9,958,076
Loan obligations of Consolidated CLOs
DEBT
Loan Obligations	10,301,292	10,278,833
Fair Value of Loan Obligations	10,174,794	9,958,076
Senior secured notes | Loan obligations of Consolidated CLOs
DEBT
Loan Obligations	9,577,725	9,796,442
Fair Value of Loan Obligations	$ 9,561,079	$ 9,665,804
Weighted  Average Remaining Maturity  In Years	9 years 6 months	10 years 1 month 6 days
Debt instrument face amount	$ 9,600,000
Weighted average interest rate	1.96%
Subordinated notes | Loan obligations of Consolidated CLOs
DEBT
Loan Obligations	$ 723,567	$ 482,391
Fair Value of Loan Obligations	$ 613,715	$ 292,272
Weighted  Average Remaining Maturity  In Years	8 years 3 months 18 days	10 years 2 months 12 days
Debt instrument face amount	$ 723,600