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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Non-amortizing intangibles $ 94,433 $ 94,433
Gross carrying amount 35,699 35,699
Accumulated amortization and other (27,230) (26,617)
Total 8,469 9,082
Total intangible assets, gross carrying amount 133,376 133,376
Intangible assets, net 106,146 106,759
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 (594) (340)
Total 6,217 6,471
Subscriber relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 28,425 28,425
Accumulated amortization and other (26,338) (26,000)
Total 2,087 2,425
Other intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 463 463
Accumulated amortization and other (298) (277)
Total 165 186
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 29,958 29,958
Railroad crossing rights    
Finite-Lived Intangible Assets [Line Items]    
Non-amortizing intangibles $ 141 $ 141