Changes in Operations and Non-operating Items Narrative (Details) $ in Thousands			3 Months Ended				9 Months Ended	12 Months Ended
	Apr. 02, 2015 USD ($)	Oct. 01, 2014 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 29, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 28, 2014 USD ($) Investment	Sep. 02, 2015	Jul. 29, 2008
Schedule of Other Nonoperating Income (Expense) [Line Items]
Workers Compensation Reserve Adjustment								$ 5,000	$ 9,000
Write-off of unamortized debt issuance costs and discounts			$ 0	$ 0	$ 37,040	$ 0		0	37,040	$ 0
Non-cash pretax charge to write down assets									(2,000)	$ (3,000)
Number of equity method investments | Investment										1
Newsday LLC
Schedule of Other Nonoperating Income (Expense) [Line Items]
Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments							$ 3,000		3,000
Investment ownership, percentage											3.00%	3.00%
Classified Ventures LLC
Schedule of Other Nonoperating Income (Expense) [Line Items]
Pretax gain on sale of equity method investment									8,000	$ 372,000
Ownership in equity method investment, percent		27.80%
Company's portion of proceeds from sale of equity method investments	$ 8,000	$ 686,000
Company's portion of proceeds from sale of equity method investment held in escrow		$ 28,000
Employee Severance
Schedule of Other Nonoperating Income (Expense) [Line Items]
Severance Costs								10,406	5,276	2,634
Severance and Related Activity Liability			$ 3,595					8,981	3,595	1,357
Discontinued Operations | Employee Severance
Schedule of Other Nonoperating Income (Expense) [Line Items]
Severance Costs								$ 500	$ 1,000	$ 10,000