INVESTMENTS - Equity Method Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Total Assets	$ 79,806,502	$ 60,899,319
Total Liabilities	39,006,586	30,396,945
Total Equity	40,799,916	30,502,374	$ 24,259,968
Investment Related Expenses	969,871	1,043,551	876,029
Other Expenses	2,933,132	2,908,431	2,089,477
Net Realized and Unrealized Gain/(Loss) from Investments	3,642,804	3,161,884	1,254,832
Net Income (Loss)	5,117,598	4,639,540	2,450,946
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Total Assets	127,447,298	112,688,482
Total Liabilities	25,934,871	22,622,609
Total Equity	101,512,427	90,065,873
Investment Related Revenues	3,957,091	2,552,266	1,679,950
Other Revenues	3,526,681	5,132,796	5,304,634
Investment Related Expenses	2,347,521	1,385,870	1,258,782
Other Expenses	2,534,041	4,066,713	3,602,612
Net Realized and Unrealized Gain/(Loss) from Investments	8,007,682	10,532,988	1,818,861
Net Income (Loss)	$ 10,609,892	$ 12,765,467	$ 3,942,051