Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Robert E Shaw [Member]
Related Party Transaction [Line Items]
Ownership of Common Stock, Percentage	8.40%		8.40%
Voting Interest of Common Stock, Percentage	3.90%		3.90%
Related Party Transaction, Purchases from Related Party	$ 2,396	$ 2,666	$ 6,889	$ 8,792
Related Party Transaction, Purchases from Related Party, Percentage	2.90%	3.20%	2.90%	3.80%
James Horwich [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 114	$ 114	$ 343	$ 229
Robert P Rothman [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 66	$ 65	$ 196	$ 192