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Intangible Assets and Goodwill - Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Gross $ 2,164,259 $ 748,458  
Accumulated Amortization (582,633) (423,721)  
Net $ 1,581,626 $ 324,737  
Network Affiliation Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life, in years 15 years 15 years 15 years
Gross $ 1,971,170 $ 659,054  
Accumulated Amortization (461,345) (357,704)  
Net 1,509,825 301,350  
Other definite-lived intangible assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross 193,089 89,404  
Accumulated Amortization (121,288) (66,017)  
Net $ 71,801 $ 23,387  
Other definite-lived intangible assets [Member] | Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life, in years 1 year 1 year  
Other definite-lived intangible assets [Member] | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life, in years 20 years 20 years