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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 04, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]        
Payments to Acquire Intangible Assets   $ 1,883 $ 24,864 $ 7,229
Other intangible assets   823,589 823,500  
Estimated amortization expense of intangible assets for 2021   54,900    
Estimated amortization expense of intangible assets for 2022   49,700    
Estimated amortization expense of intangible assets for 2023   44,000    
Estimated amortization expense of intangible assets for 2024   42,700    
Estimated amortization expense of intangible assets for 2025   41,000    
Estimated amortization expense of intangible assets for later years   386,300    
Other intangible assets        
Goodwill [Line Items]        
Other intangible assets   104,445 102,956  
Series of Individually Immaterial Business Acquisitions        
Goodwill [Line Items]        
Payments to Acquire Intangible Assets $ 23,600      
Series of Individually Immaterial Business Acquisitions | Other intangible assets        
Goodwill [Line Items]        
Other intangible assets 4,100      
FCC licenses        
Goodwill [Line Items]        
Indefinite-lived intangible assets - FCC licenses   $ 356,815 $ 385,915  
FCC licenses | Series of Individually Immaterial Business Acquisitions        
Goodwill [Line Items]        
Indefinite-lived intangible assets - FCC licenses $ 19,200