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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Dec. 31, 2020	Feb. 28, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Amortization expense					$ 700	$ 500	$ 200
FCC spectrum licenses
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired			$ 16,100
Canaan Cable
Business Acquisition [Line Items]
Aggregate purchase price	$ 2,100
Property, plant and equipment acquired	1,100				1,100
Goodwill	600				600
Remitted portion of acquisition price	1,890
Accrued portion of acquisition price	210
Big sandy acquisition
Business Acquisition [Line Items]
Aggregate purchase price		$ 10,000
Property, plant and equipment acquired		4,600
Goodwill		2,600
Subscriber relationships | Canaan Cable
Business Acquisition [Line Items]
Subscriber relationship acquired	$ 400				$ 400
Subscriber relationships | Big sandy acquisition
Business Acquisition [Line Items]
Subscriber relationship acquired		$ 2,800
FCC spectrum licenses
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired				$ 13,800
Finite-lived intangible assets acquired				$ 4,700

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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