Acquisitions and Dispositions (Details 1) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended													12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	[1]	Dec. 31, 2016	[1]	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Net operating revenue														$ 123,651	$ 126,789
Station operating expense														92,563	93,818
Corporate general and administrative														11,657	10,980
Other operating (income) expenses, net														55	(1,351)
Impairment of intangible assets														1,449	0
Operating income														17,927	23,342
Interest expense														903	744
Income from continuing operations before income tax expense	$ 3,659	$ 5,255	$ 5,647	$ 1,765		$ 5,557		$ 6,581		$ 6,214		$ 3,431		17,024	22,598
Income tax (benefit) expense														(5,634)	9,207
Income from continuing operations, net of tax														22,658	13,391
Income from discontinued operations, net of tax														32,471	5,276
Net income														$ 55,129	$ 18,667
Basic earnings per share:
From continuing operations														$ 3.84	$ 2.28
From discontinued operations														5.50	0.90
Basic earnings per share														9.34	3.18
Diluted earnings per share:
From continuing operations														3.84	2.28
From discontinued operations														5.50	0.90
Diluted earnings per share														$ 9.34	$ 3.18

[1] Certain prior year amounts and March 31, 2017 quarterly data have been reclassified to conform with current presentation.