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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Non-amortizing intangibles $ 64,475 $ 64,475
Gross carrying amount 28,888 28,888
Accumulated amortization and other (26,995) (26,754)
Total 1,893 2,134
Total intangible assets, gross carrying amount 96,607 96,607
Intangible assets, net 69,612 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 (26,679) (26,451)
Total 1,746 1,974
Other intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 463 463
Accumulated amortization and other (316) (303)
Total 147 160
Cable franchise rights    
Finite-Lived Intangible Assets [Line Items]    
Non-amortizing intangibles 64,334 64,334
Railroad crossing rights    
Finite-Lived Intangible Assets [Line Items]    
Non-amortizing intangibles $ 141 $ 141