SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2023		Dec. 31, 2022
Liabilities subject to fair value measurement:
Employment agreement award	$ 23,000		$ 25,700
Total	22,970		25,741
Mezzanine equity subject to fair value measurement:
Redeemable noncontrolling interests	16,520	[1]	25,298
Assets subject to fair value measurement:
Available for sale securities	0		136,826
Cash equivalents - money market funds	193,769		39,798
Assets subject to fair value measurement value			176,624
Fair Value, Inputs, Level 1 [Member]
Assets subject to fair value measurement:
Cash equivalents - money market funds	193,769		39,798
Assets subject to fair value measurement value			39,798
Fair Value, Inputs, Level 3 [Member]
Liabilities subject to fair value measurement:
Total	22,970		25,741
Mezzanine equity subject to fair value measurement:
Redeemable noncontrolling interests	$ 16,520	[1]	25,298
Assets subject to fair value measurement:
Available for sale securities			136,826
Assets subject to fair value measurement value			$ 136,826

[1] The redeemable noncontrolling interests in Reach Media are measured at fair value using a discounted cash flow methodology as of December 31, 2022. Significant inputs to the discounted cash flow analysis include revenue growth rates, future operating profit margins, and discount rate. As of December 31, 2023 the fair value is measured using an exit price methodology. Significant inputs to the exit price analysis include revenue growth rates, future operating profit margins, discount rate and an exit multiple.