SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measured on recurring basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 1	$ 0	$ 0
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount 1	0	0
Fair Value, Liabilities, Level 3 Transfers, Amount 1	0	0
Employment Agreement Award
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	22,970	25,741
Change in fair value	(23)	(144)
Balance, end of period	22,947	25,597
Redeemable noncontrolling interests
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	16,520	25,298
Net income attributable to noncontrolling interests	242	511
Purchase of ownership interest in Reach Media	(7,603)
Dividends paid to noncontrolling interests	(1,799)	(2,001)
Change in fair value	1,004	1,308
Balance, end of period	$ 8,364	$ 25,116