ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Revenue	$ 121,571	$ 115,206	$ 220,020	$ 214,827
Radio Advertising [Member]
Net Revenue	52,194	48,880	94,607	93,502
Political Advertising [Member]
Net Revenue	317	1,182	441	1,383
Digital Advertising [Member]
Net Revenue	7,663	6,559	15,100	14,705
Cable Television Advertising [Member]
Net Revenue	19,816	18,118	40,009	37,054
Cable Television Affiliate Fees [Member]
Net Revenue	26,599	28,020	54,074	55,269
Event Revenues & Other [Member]
Net Revenue	$ 14,982	$ 12,447	$ 15,789	$ 12,914