SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measured on recurring basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ 136,826	$ 112,600
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	(136,826)	24,226
Change in fair value	0	0
Balance, end of period	0	136,826
Employment agreement award
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	25,741	28,193
Net income attributable to redeemable noncontrolling interests	0	0
Dividends paid to redeemable noncontrolling interests	0	0
Distribution	(2,940)	(4,039)
Change in fair value included within other comprehensive income	0	0
Change in fair value	169	1,587
Balance, end of period	22,970	25,741
Redeemable Noncontrolling Interest [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	25,298	18,655
Net income attributable to redeemable noncontrolling interests	2,530	2,626
Dividends paid to redeemable noncontrolling interests	4,401	1,599
Change in fair value	(6,907)	5,616
Balance, end of period	$ 16,520	$ 25,298