Condensed Consolidated Statements Of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Condensed Consolidated Statements Of Comprehensive Loss [Abstract]
Net income (loss)	$ 5,473	$ (3,232)	$ (2,248)	$ (16,575)
Other comprehensive income (loss):
Change in fair value of derivatives, net of tax of $227, ($214), $41 and $48	(745)	637	(217)	(311)
Change in fair value of investment securities, net of tax of $47, ($71), $13 and $153	(134)	202	(37)	(246)
Other comprehensive income (loss)	(879)	839	(254)	(557)
Comprehensive income (loss)	$ 4,594	$ (2,393)	$ (2,502)	$ (17,132)