Broadcast Licenses, Goodwill and Other Intangible Assets (Details 3) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 15,206	$ 13,288
Accumulated Amortization	12,488	11,729
Net Amount	2,718	1,559
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,546	1,744
Accumulated Amortization	1,529	747
Net Amount	2,017	997
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,861	3,861
Accumulated Amortization	3,861	3,861
Net Amount	0	0
Favorable Lease Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,965	5,763
Accumulated Amortization	5,468	5,439
Net Amount	497	324
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,834	1,920
Accumulated Amortization	1,630	1,682
Net Amount	$ 204	$ 238