Discontinued Operations - Income Statement Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 28, 2015	Jun. 30, 2016	Jun. 28, 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	$ 77,337	$ (7,474)	$ 120,818
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		705,255		1,400,006
Income (loss) from discontinued operations, before income taxes		107,862		172,720
Provision for income taxes		(31,607)		(44,876)
Income (loss) from discontinued operations, net of tax		76,255		127,844
Discontinued Operations, Disposed of by Sale | Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues		59,465	3,379	105,988
Income (loss) from discontinued operations, before income taxes		2,079	(6,299)	(9,789)
Provision for income taxes		(997)	(1,175)	2,763
Income (loss) from discontinued operations, net of tax		1,082	$ (7,474)	(7,026)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues		764,720		1,505,994
Income (loss) from discontinued operations, before income taxes		109,941		162,931
Provision for income taxes		(32,604)		(42,113)
Income (loss) from discontinued operations, net of tax		$ 77,337		$ 120,818