SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of fair value measurement of level 3 financial assets and liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Equity securities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at Beginning of period	$ 377,549	$ 149,292
Fair Value Adjustments	(24,047)	53,074
Relating to Undistributed Earnings	0	0
Purchases, Sales and Settlements	18,423	119,745
Transfer in and/or out of Level 3	(38,009)	(3,613)
Balance at End of period	333,916	318,498
Loans receivable at fair value
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at Beginning of period	873,186	390,689
Fair Value Adjustments	(47)	10,141
Relating to Undistributed Earnings	5,373	4,473
Purchases, Sales and Settlements	(66,835)	(135,008)
Transfer in and/or out of Level 3	(40,837)	0
Balance at End of period	770,840	270,295
Mandatorily redeemable noncontrolling interests issued after November 5, 2003
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at Beginning of period	4,506	4,700
Fair Value Adjustments	0	0
Relating to Undistributed Earnings	468	(595)
Purchases, Sales and Settlements	(814)	0
Transfer in and/or out of Level 3	0	0
Balance at End of period	4,160	$ 4,105
Contingent earnout
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at Beginning of period	0
Fair Value Adjustments	(4,500)
Relating to Undistributed Earnings	0
Purchases, Sales and Settlements	22,222
Transfer in and/or out of Level 3	0
Balance at End of period	$ 17,722