INCOME TAXES - Components of deferred tax assets and liabilities (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Allowance for doubtful accounts	$ 1,804,000	$ 2,001,000
Accruals	528,000	1,685,000
Fixed assets	418,000	970,000
Stock-based compensation	499,000	543,000
Net operating loss carryforwards	103,700,000	121,562,000
Lease liability	12,094,000
Interest expense carryforward	16,224,000	6,519,000
Alternative minimum tax credit	428,000	856,000
Other	(324,000)	1,192,000
Total deferred tax assets	135,371,000	135,328,000
Valuation allowance for deferred tax assets	(249,000)	(235,000)
Total deferred tax asset, net of valuation allowance	135,122,000	135,093,000
Deferred tax liabilities:
Intangible assets	(147,350,000)	(145,072,000)
Right of use asset	(10,100,000)
Partnership interests	(1,813,000)	(1,795,000)
Qualified film expenditures	(419,000)	(1,130,000)
Total deferred tax liabilities	(159,682,000)	(147,997,000)
Net deferred tax liability	$ (24,560,000)	$ (12,904,000)