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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Non-amortizing intangibles $ 77,013 $ 76,982
Gross carrying amount 43,549 42,957
Accumulated amortization and other (30,714) (29,271)
Total 12,835 13,686
Total intangible assets, gross carrying amount 188,100 186,994
Intangible assets, net 157,386 157,723
Subscriber relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 43,012 42,447
Accumulated amortization and other (30,303) (28,882)
Total 12,709 13,565
Other intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 537 510
Accumulated amortization and other (411) (389)
Total 126 121
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 557 526
Goodwill    
Finite-Lived Intangible Assets [Line Items]    
Goodwill, gross 67,538 67,055
Goodwill, net $ 67,538 $ 67,055