Acquisitions and Dispositions (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets Acquired:
Current assets	$ 1,335	$ 814
Property and equipment	6,678	375
Other assets:
Broadcast licenses	8,086	8,123
Goodwill	8,151	4,533
Other intangibles, deferred costs and investments	2,019	398
Total other assets	18,256	13,054
Total assets acquired	26,269	14,243
Liabilities Assumed:
Current liabilities	413	41
Total liabilities assumed	413	41
Net assets acquired	$ 25,856	$ 14,202