Condensed Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013
Net (loss) income	$ (16,406)	$ 16,259	$ (38,794)	$ (13,413)
Other comprehensive (loss) income:
Foreign currency translation adjustment	204	(89)	(250)	(431)
Defined benefit pension plan adjustments	21	81	62	246
Total comprehensive (loss) income	$ (16,181)	$ 16,251	$ (38,982)	$ (13,598)