ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Net Revenue	$ 105,854	$ 111,055	$ 121,571	$ 98,449	$ 113,541	$ 110,730	$ 115,206	$ 99,621	$ 436,929	$ 439,098
Radio Advertising [Member]
Net Revenue									193,318	197,594
Political Advertising [Member]
Net Revenue									1,445	6,590
Digital Advertising [Member]
Net Revenue									31,912	31,510
Cable Television Advertising [Member]
Net Revenue									79,776	76,429
Cable Television Affiliate Fees [Member]
Net Revenue									105,071	107,277
Event Revenues & Other [Member]
Net Revenue									$ 25,407	$ 19,698