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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands, shares in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary of Significant Accounting Policies [Line Items]      
Unearned revenue $ 20,000 $ 14,101  
Unearned revenue recognized during the year 12,600    
Programming assets, amortization expense, next twelve months 181,100    
Programming assets, amortization expense, year two 119,000    
Programming assets, amortization expense, year three 83,000    
Programming assets, amortization expense, year four 49,800    
Programming assets, amortization expense, year five 36,300    
Programming assets, amortization expense, thereafter 25,000    
FCC repack receivable 773 12,363  
Deferred FCC repack income 47,977 44,945  
Estimated liabilities for unpaid claims $ 10,200 $ 9,300  
Anti-dilutive securities (in shares)   0.4 1.4
Other affiliation relationships      
Summary of Significant Accounting Policies [Line Items]      
Estimated useful life 20 years    
Customer lists and advertiser relationships      
Summary of Significant Accounting Policies [Line Items]      
Estimated useful life 20 years    
FCC licenses | Maximum      
Summary of Significant Accounting Policies [Line Items]      
FCC license term 8 years    
Revenue Benchmark | Advertising | Advertising      
Summary of Significant Accounting Policies [Line Items]      
Concentration risk, percentage 71.00%