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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands, shares in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of Significant Accounting Policies [Line Items]      
Unsatisfied performance obligations $ 75,300    
Unearned revenue 14,101 $ 10,704  
Unearned revenue recognized during the year 10,000    
Capitalized customer acquisition costs (5,800) (9,300)  
Amortization of customer acquisition costs (5,000) (4,200)  
Programming assets, amortization expense, next twelve months 53,700    
Programming assets, amortization expense, year two 34,500    
Programming assets, amortization expense, year three 15,600    
Programming assets, amortization expense, year four 7,200    
Programming assets, amortization expense, year five 2,600    
Programming assets, amortization expense, thereafter 6,700    
FCC repack receivable 12,363 29,651  
Deferred FCC repack income 44,945 36,770  
Estimated liabilities for unpaid claims $ 9,300 $ 9,100  
Anti-dilutive securities 0.4 1.4 0.1
Journal Media Group | Accounts receivable      
Summary of Significant Accounting Policies [Line Items]      
Estimated liabilities for unpaid claims $ 1,300    
Television network 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    
Operating revenue | Advertising      
Summary of Significant Accounting Policies [Line Items]      
Concentration risk, percentage 64.00%