Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Non-amortizing intangibles	$ 78,314	$ 94,433
Gross carrying amount	35,699	35,699
Accumulated amortization and other	(27,426)	(26,617)
Total	8,273	9,082
Total intangible assets, gross carrying amount	117,257	133,376
Intangible assets, net	89,831	106,759
Broadband
Finite-Lived Intangible Assets [Line Items]
Goodwill, gross	3,244	3,244
Goodwill	3,244	3,244
FCC spectrum licenses
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	6,811	6,811
Accumulated amortization and other	(672)	(340)
Total	6,139	6,471
Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	28,425	28,425
Accumulated amortization and other	(26,451)	(26,000)
Total	1,974	2,425
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	463	463
Accumulated amortization and other	(303)	(277)
Total	160	186
Cable franchise rights
Finite-Lived Intangible Assets [Line Items]
Non-amortizing intangibles	64,334	64,334
FCC spectrum licenses
Finite-Lived Intangible Assets [Line Items]
Non-amortizing intangibles	13,839	29,958
Railroad crossing rights
Finite-Lived Intangible Assets [Line Items]
Non-amortizing intangibles	$ 141	$ 141