Condensed Consolidated Statements Of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Condensed Consolidated Statements Of Comprehensive Loss [Abstract]
Net loss	$ (8,579)	$ (3,480)	$ (3,924)	$ (7,721)
Other comprehensive income (loss):
Change in fair value of derivatives, net of tax of $nil, ($243), $nil and ($185)	2,354	691	2,020	528
Change in fair value of investment securities, net of tax of $nil, ($28), $nil and ($34)	(262)	81	242	97
Other comprehensive loss	2,092	772	2,262	625
Comprehensive loss	$ (6,487)	$ (2,708)	$ (1,662)	$ (7,096)