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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Total indefinite-lived intangibles $ 78,314 $ 78,314
Gross Carrying Amount 49,305 33,187
Accumulated Amortization and Other (26,450) (25,947)
Net 22,855 7,240
Total intangible assets, gross carrying amount 130,306 114,188
Intangible assets, net 103,856 88,241
Broadband    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 2,687 2,687
Net 2,687 2,687
FCC spectrum licenses    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 20,777 4,659
Accumulated Amortization and Other (280) (97)
Net 20,497 4,562
Acquired subscribers - Cable    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 28,065 28,065
Accumulated Amortization and Other (25,900) (25,600)
Net 2,165 2,465
Other intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 463 463
Accumulated Amortization and Other (270) (250)
Net 193 213
Cable franchise rights    
Finite-Lived Intangible Assets [Line Items]    
Total indefinite-lived intangibles 64,334 64,334
FCC spectrum licenses    
Finite-Lived Intangible Assets [Line Items]    
Total indefinite-lived intangibles 13,839 13,839
Railroad crossing rights    
Finite-Lived Intangible Assets [Line Items]    
Total indefinite-lived intangibles $ 141 $ 141