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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Non-amortizing intangibles $ 76,756 $ 76,673
Gross carrying amount 28,935 28,935
Accumulated amortization and other (27,852) (27,729)
Total 1,083 1,206
Total intangible assets, gross carrying amount 108,935 108,852
Intangible assets, net 81,083 81,123
Subscriber relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 28,425 28,425
Accumulated amortization and other (27,485) (27,370)
Total 940 1,055
Other intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 510 510
Accumulated amortization and other (367) (359)
Total 143 151
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 12,122
Railroad crossing rights and other    
Finite-Lived Intangible Assets [Line Items]    
Non-amortizing intangibles 300 217
Goodwill    
Finite-Lived Intangible Assets [Line Items]    
Goodwill, gross 3,244 3,244
Goodwill $ 3,244 $ 3,244