Investments - Madison (Details) - Madison Paper Industries - USD ($) $ in Thousands	9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015
Schedule of Equity Method Investments [Line Items]
Revenues	$ 40,523	$ 93,490
Operating costs
Cost of sales	68,039	84,445
General and administrative	66,056	15,363
Operating expense	134,095	99,808
Operating loss	(93,572)	(6,318)
Other income	4	3
Net loss	$ (93,568)	$ (6,315)