Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Non-amortizing intangibles	$ 78,314	$ 78,314
Gross carrying amount	35,699	35,699
Accumulated amortization and other	(27,624)	(27,426)
Total	8,075	8,273
Total intangible assets, gross carrying amount	117,257	117,257
Intangible assets, net	89,633	89,831
Goodwill - 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	(751)	(672)
Total	6,060	6,139
Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	28,425	28,425
Accumulated amortization and other	(26,564)	(26,451)
Total	1,861	1,974
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	463	463
Accumulated amortization and other	(309)	(303)
Total	154	160
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	13,839
Railroad crossing rights
Finite-Lived Intangible Assets [Line Items]
Non-amortizing intangibles	$ 141	$ 141