Basis Of Presentation And Significant Accounting Policies (Details)				3 Months Ended
		Feb. 07, 2019	Nov. 30, 2018 USD ($) $ / shares	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Apr. 08, 2019 station	Mar. 20, 2019 station	Dec. 31, 2018 USD ($)
Investment Holdings [Line Items]
Total operating revenues				$ 454,988,000	$ 443,635,000
Operating profit (loss)	[1]			54,703,000	187,285,000
Topix LLC | Variable Interest Entity, Not Primary Beneficiary [Member]
Investment Holdings [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount				5,000,000				$ 5,000,000
Corporate and Other
Investment Holdings [Line Items]
Total operating revenues				1,561,000	2,933,000
Operating profit (loss)	[1]			(25,222,000)	(24,567,000)
Dreamcatcher Stations | Variable Interest Entity, Primary Beneficiary
Investment Holdings [Line Items]
Total operating revenues				19,000,000	18,000,000
Operating profit (loss)				$ 4,000,000	$ 3,000,000
Nexstar Merger
Investment Holdings [Line Items]
Business Acquisition, Share Price | $ / shares			$ 46.50
Business Acquisition, Share Price, Daily Price Increase After Target Close Date			$ 0.009863
Hart-Scott-Rodino Antitrust Improvement Act of 1976 Waiting Period		30 days
Television Stations Nexstar Proposes to Divest | station							19
Television Markets Nexstar Proposes to Divest							15
Contract Termination Fee			135,000,000
Contract Termination Fees Nexstar Cost Reimbursement			$ 15,000,000
Nexstar Merger | Tribune Media Company
Investment Holdings [Line Items]
Television Stations Nexstar Proposes to Divest | station							10
Nexstar Merger | Dreamcatcher Stations
Investment Holdings [Line Items]
Television Stations Nexstar Proposes to Divest | station							3
Nexstar Merger | Nexstar | Subsequent Event
Investment Holdings [Line Items]
Television Stations Nexstar Proposes to Divest | station						2

[1] (1)Operating profit (loss) for each segment excludes income and loss on equity investments, interest income, interest expense, pension and other postretirement period benefit cost (credit), non-operating items, reorganization costs and income taxes.