Manufacturing Restructuring Costs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Restructuring Cost and Reserve [Line Items]
Manufacturing restructuring costs	$ 0	$ 0	$ (331)	$ 0
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Manufacturing restructuring costs	0	0	(331)	0
Restructuring Reserve [RollForward]
Balance at the beginning of the period	2,166	3,049	2,772	3,387
Accretion of related lease obligations	128	127	252	276
Payments	(185)	(230)	(584)	(717)
Balance at the end of the period	$ 2,109	$ 2,946	$ 2,109	$ 2,946