Broadcast Licenses, Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Indefinite-lived Intangible Assets [Line Items]
Balance	$ 7,407	$ 2,874
Acquisitions	8,151	4,533
Balance	15,558	7,407
Continuing Operations [Member]
Indefinite-lived Intangible Assets [Line Items]
Balance	7,407	2,874
Acquisitions	8,151	4,533
Balance	15,558	7,407
Discontinued Operations [Member]
Indefinite-lived Intangible Assets [Line Items]
Balance	0	0
Acquisitions	0	0
Balance	$ 0	$ 0