INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Federal and state income tax loss carryforwards	$ 70,982,000	$ 81,368,000
Share-based compensation	4,221,000	3,382,000
Investments - impairments	350,000	347,000
Lease rental obligations	4,709,000	15,080,000
Deferred compensation	10,253,000	9,097,000
Deferred gain on tower transaction	0	1,732,000
Debt fair value adjustment	4,987,000	4,390,000
Reserves	0	0
Lease liability	77,722,000	0
Property, equipment and certain intangibles (other than broadcasting licenses and goodwill)	0	0
Employee benefits	2,011,000	2,396,000
Provision for doubtful accounts	4,671,000	4,406,000
Other non-current	2,432,000	5,799,000
Total deferred tax assets before valuation allowance	182,338,000	127,997,000
Valuation allowance	(25,440,000)	(25,761,000)
Total deferred tax assets	156,898,000	102,236,000
Deferred tax liabilities:
Advertiser broadcasting obligations	0	47,000
Lease ROU asset	(69,243,000)	0
Property, equipment and certain intangibles	(43,788,000)	(49,662,000)
Broadcasting licenses and goodwill	(593,525,000)	(598,603,000)
Total deferred tax liabilities	(706,556,000)	(648,218,000)
Total net deferred tax liabilities	$ (549,658,000)	$ (545,982,000)