Investments Investments - Madison (Details) - Madison Paper Industries [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Balance Sheet Information [Abstract]
Current assets	$ 3,766	$ 48,998
Noncurrent assets	8,944	54,473
Total assets	12,710	103,471
Current liabilities	1,373	13,101
Noncurrent liabilities	29,386	24,058
Total liabilities	30,759	37,159
Total equity	(18,049)	66,312
Income Statement Information [Abstract]
Revenues	40,523	133,319	$ 155,807
Cost of sales	(63,439)	(126,292)	(147,179)
General and administrative	(62,759)	(13,550)	(17,505)
Operating Expenses	(126,198)	(139,842)	(164,684)
Operating loss	(85,675)	(6,523)	(8,877)
Other income	2	689	(9,977)
Net loss	$ (85,673)	$ (5,834)	$ (18,854)