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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Goodwill [Line Items]    
Goodwill $ 149,070 $ 146,497
Wireless    
Goodwill [Line Items]    
Goodwill 146,383 146,383
Cable    
Goodwill [Line Items]    
Goodwill 2,677 104
Wireline    
Goodwill [Line Items]    
Goodwill $ 10 $ 10