Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 28, 2015 Rate	Mar. 29, 2014 Rate
Robert E Shaw [Member]
Related Party Transaction [Line Items]
Ownership of Common Stock, Percentage	8.40%
Voting Interest of Common Stock, Percentage	4.20%
Related Party Transaction, Purchases from Related Party	$ 1,861	$ 2,663
Related Party Transaction, Purchases from Related Party, Percentage	2.60%	4.00%
James Horwich [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	114	15
Robert P Rothman [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	$ 65	$ 64