INCOME TAXES - Components of deferred tax assets and liabilities (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Allowance for doubtful accounts	$ 2,149,000	$ 2,111,000
Accruals	304,000	465,000
Fixed assets	488,000	486,000
Stock-based compensation	328,000	163,000
Net operating loss carryforwards	88,813,000	109,343,000
Lease liability	8,901,000	10,022,000
Interest expense carryforward	23,788,000	20,380,000
Total deferred tax assets	124,771,000	142,970,000
Valuation allowance for deferred tax assets	(30,000)	(264,000)
Total deferred tax asset, net of valuation allowance	124,741,000	142,706,000
Deferred tax liabilities:
Intangible assets	(129,026,000)	(131,682,000)
Available-for-sale securities	(23,779,000)	(17,618,000)
Right of use asset	(8,123,000)	(8,924,000)
Partnership interests	(2,412,000)	(1,964,000)
Deferred financing costs	(958,000)	(1,196,000)
Other	(147,000)	(199,000)
Total deferred tax liabilities	(164,445,000)	(161,583,000)
Net deferred tax liability	$ (39,704,000)	$ (18,877,000)