Nature of Business and Significant Accounting Policies - Goodwill and Other Intangibles and Deferred Financing Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred financing costs:
Accumulated amortization of deferred financing costs	$ 2.3	$ 2.0
Deferred financing costs, net	1.0	1.3
Interest expense
Deferred financing costs:
Amortization of deferred financing costs	$ 0.3	$ 0.2
Customer relationships, non-compete agreements, affiliate agreements, and programming rights | Minimum
Goodwill and other intangibles:
Useful lives	1 year
Customer relationships, non-compete agreements, affiliate agreements, and programming rights | Maximum
Goodwill and other intangibles:
Useful lives	10 years