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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
Non-amortizing intangibles $ 76,673 $ 76,597
Gross carrying amount 28,935 28,913
Accumulated amortization and other (27,729) (27,239)
Total 1,206 1,674
Total intangible assets, gross carrying amount 108,852 108,754
Intangible assets, net 81,123 81,515
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 (27,370) (26,910)
Total 1,055 1,515
Other intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 510 488
Accumulated amortization and other (359) (329)
Total 151 159
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    
Finite-Lived Intangible Assets [Line Items]    
Non-amortizing intangibles $ 217 $ 141