Operating Results Historically Included Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013
Discontinued Operations And Disposal Groups [Abstract]
Sales from discontinued operations	$ 225	$ 5,625	$ 10,512	$ 28,296
Loss from discontinued operations, before income tax	(1,256)	(152)	(6,243)	(2,831)
Loss from discontinued operations, net of tax	(273)	(185)	(4,817)	(1,643)
Loss on disposal of discontinued operations, net of tax	$ (321)	$ (281)	$ (321)	$ (592)