Discontinued Operations - Income Statement Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 27, 2015	Sep. 30, 2016	Sep. 27, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of tax	$ 0	$ (5,317)	$ (7,474)	$ 115,501
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Publishing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues		0		1,400,006
Income (loss) from discontinued operations, before income taxes		(3,500)		169,220
Benefit (Provision) for income taxes		1,141		(43,735)
Income (loss) from discontinued operations, net of tax		(2,359)		125,485
Discontinued Operations, Disposed of by Sale | Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues		49,569	3,379	155,557
Income (loss) from discontinued operations, before income taxes		(1,744)	(6,299)	(11,533)
Benefit (Provision) for income taxes		(1,214)	(1,175)	1,549
Income (loss) from discontinued operations, net of tax		(2,958)	$ (7,474)	(9,984)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues		49,569		1,555,563
Income (loss) from discontinued operations, before income taxes		(5,244)		157,687
Benefit (Provision) for income taxes		(73)		(42,186)
Income (loss) from discontinued operations, net of tax		$ (5,317)		$ 115,501