Journal Broadcast Merger and Newspaper Spin-off (Discontinued Operations) - Narrative (Details) - USD ($)		12 Months Ended
	Apr. 01, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other Receivables, Gross, Current			$ 2,000,000
Acquisition and related integration costs		$ 578,000	37,988,000	$ 9,708,000
2015 Journal acquisition
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash dividend	$ 60,000,000
Proceeds from services provided to merger partner			3,300,000
Payments for services provided by merger partner			1,200,000
Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction costs expensed			41,000,000
Disposal Group, including discontinued operation, professional fees			3,000,000
Spinoff | 2015 Journal acquisition
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of long-lived assets, held-and-used			$ 0
Impairment of long-lived assets, held-for-sale	$ 30,000,000