SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measured on recurring basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Debt Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ 112,600	$ 103,100
Net income attributable to redeemable noncontrolling interests	0	0
Dividends paid to redeemable noncontrolling interests	0	0
Distribution	0	0
Change in fair value included within other comprehensive income	24,226	9,500
Change in fair value	0	0
Balance, end of period	136,826	112,600
The amount of total (losses)/income for the period included in earnings attributable to the change in unrealized losses/income relating to assets and liabilities still held at the reporting date	0	0
Employment agreement award
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	28,193	25,603
Net income attributable to redeemable noncontrolling interests	0	0
Dividends paid to redeemable noncontrolling interests	0	0
Distribution	(4,039)	(3,573)
Change in fair value included within other comprehensive income	0	0
Change in fair value	2,129	6,163
Balance, end of period	26,283	28,193
The amount of total (losses)/income for the period included in earnings attributable to the change in unrealized losses/income relating to assets and liabilities still held at the reporting date	(2,129)	(6,163)
Redeemable Noncontrolling Interest [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	18,655	13,942
Net income attributable to redeemable noncontrolling interests	2,626	2,315
Dividends paid to redeemable noncontrolling interests	1,599	2,400
Change in fair value	5,616	4,798
Balance, end of period	25,298	18,655
Contingent Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	0	780
Net income attributable to redeemable noncontrolling interests	0	0
Dividends paid to redeemable noncontrolling interests	0	0
Distribution	0	(1,060)
Change in fair value included within other comprehensive income	0	0
Change in fair value	0	280
Balance, end of period	0	0
The amount of total (losses)/income for the period included in earnings attributable to the change in unrealized losses/income relating to assets and liabilities still held at the reporting date	$ 0	$ (280)