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Acquisitions, Dispositions, and Deconsolidations - Acquired Intangible Assets (Details) - Other
$ in Thousands
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]  
Intangibles $ 80,378
FCC licenses  
Business Acquisition [Line Items]  
Intangibles 75,852
Trade names  
Business Acquisition [Line Items]  
Intangibles 208
Other  
Business Acquisition [Line Items]  
Intangibles $ 4,318