Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Summary of Significant Accounting Policies [Line Items]
Unsatisfied performance obligations	$ 68,900
Amount of remaining performance obligations	92.00%
Unearned revenue	$ 11,459	$ 7,353
Capitalized customer acquisition costs	9,700	8,000
Amortization of customer acquisition costs	1,000
Programming assets, amortization expense, next twelve months	45,300
Programming assets, amortization expense, year one	29,300
Programming assets, amortization expense, year two	19,900
Programming assets, amortization expense, year three	7,400
Programming assets, amortization expense, year four	1,000
Programming assets, amortization expense, thereafter	200
FCC repack receivable	19,242	0
Deferred FCC repack income	20,620	0
Estimated liabilities for unpaid claims	9,800	$ 9,800
Journal Media Group | Accounts receivable
Summary of Significant Accounting Policies [Line Items]
Estimated liabilities for unpaid claims	$ 1,700
Television network affiliation relationships
Summary of Significant Accounting Policies [Line Items]
Estimated useful life	20 years
Customer lists and other intangible assets
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	69.00%