Acquisition (Details) - USD ($) $ in Thousands	Feb. 28, 2019	Sep. 30, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill acquired		$ 149,070	$ 146,497
Big Sandy Acquisition
Business Acquisition [Line Items]
Cash purchase price	$ 10,000
Property, plant and equipment acquired	4,600
Goodwill acquired	2,600
Subscriber Relationships | Big Sandy Acquisition
Business Acquisition [Line Items]
Subscriber relationships acquired	$ 2,800
Estimated useful life, acquired intangible asset	7 years
Minimum | Big Sandy Acquisition
Business Acquisition [Line Items]
Estimated useful life, acquired property, plant and equipment	2 years 6 months
Maximum | Big Sandy Acquisition
Business Acquisition [Line Items]
Estimated useful life, acquired property, plant and equipment	12 years 6 months