Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 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	$ 2,632	$ 3,463	$ 4,493	$ 6,127
Related Party Transaction, Purchases from Related Party, Percentage	3.30%	4.30%	2.90%	4.10%
James Horwich [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 114	$ 114	$ 229	$ 114
Robert P Rothman [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 65	$ 64	$ 130	$ 127