CONSOLIDATED STATEMENTS OF OPERATIONS [Parenthetical] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Broadcast operating expenses exclusive of depreciation and amortization	$ 145,494	$ 146,283	$ 140,819
Unallocated corporate expenses exclusive of depreciation and amortization	16,255	14,994	15,146
Related Party [Member]
Broadcast operating expenses exclusive of depreciation and amortization	1,705	1,663	1,509
Unallocated corporate expenses exclusive of depreciation and amortization	$ 238	$ 301	$ 133