SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of fair value measurement of level 3 financial assets and liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Equity securities | Significant unobservable inputs (Level 3)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	$ 368,465	$ 377,549
Fair Value Adjustments	(9,016)	(4,543)
Relating to Undistributed Earnings	0	0
Purchases, Sales and Settlements	6,487	19,912
Transfer in and/or out of Level 3	(6,895)	(4,254)
Balance at end of period	359,041	388,664
Loans receivable at fair value | Significant unobservable inputs (Level 3)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	701,652	873,186
Fair Value Adjustments	43,459	10,937
Relating to Undistributed Earnings	231	3,238
Purchases, Sales and Settlements	26,743	(4,970)
Transfer in and/or out of Level 3	0	0
Balance at end of period	772,085	882,391
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | Significant unobservable inputs (Level 3)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	4,648	4,506
Fair Value Adjustments	0	0
Relating to Undistributed Earnings	308	247
Purchases, Sales and Settlements	(302)	(251)
Transfer in and/or out of Level 3	0	0
Balance at end of period	4,654	4,502
Contingent consideration
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	31,046	0
Fair Value Adjustments	(3,447)	0
Relating to Undistributed Earnings	0	0
Purchases, Sales and Settlements	1,285	22,464
Transfer in and/or out of Level 3	0	0
Balance at end of period	$ 28,884	$ 22,464