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Goodwill and Intangibles, net - Indefinite-lived Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Acquired Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 122,431 $ 85,332
State licenses    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 2,450 2,450
FCC licenses and Channel share arrangements    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 119,981 76,490
Developed technology    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 0 $ 6,392