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Intangible Assets and Goodwill - Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross $ 4,138,117 $ 4,185,256
Accumulated Amortization (1,198,916) (925,636)
Net $ 2,939,201 $ 3,259,620
Network affiliation agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life, in years 15 years 15 years
Gross $ 3,125,320 $ 3,223,906
Accumulated Amortization (875,037) (691,640)
Net 2,250,283 2,532,266
Other definite-lived intangible assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross 1,012,797 961,350
Accumulated Amortization (323,879) (233,996)
Net $ 688,918 $ 727,354
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