Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Non-amortizing intangibles	$ 76,597	$ 64,475
Gross carrying amount	28,888	28,888
Accumulated amortization and other	(27,117)	(26,754)
Total	1,771	2,134
Total intangible assets, gross carrying amount	108,729	96,607
Intangible assets, net	81,612	69,853
Goodwill - Broadband
Finite-Lived Intangible Assets [Line Items]
Goodwill, gross	3,244	3,244
Goodwill	3,244	3,244
Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	28,425	28,425
Accumulated amortization and other	(26,794)	(26,451)
Total	1,631	1,974
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	463	463
Accumulated amortization and other	(323)	(303)
Total	140	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	12,122	0
Railroad crossing rights
Finite-Lived Intangible Assets [Line Items]
Non-amortizing intangibles	$ 141	$ 141