Consolidated Statements Of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Statement of Comprehensive Income [Abstract]
Net (loss) earnings	$ (9,492)	$ 9,854	$ (12,051)	$ 9,725
Other comprehensive (loss) income, net of tax:
Pension liability adjustments, net of tax benefit of $432, $112, $435 and $222, respectively	(489)	277	3,942	555
Foreign currency translation adjustment	1,031	470	(13,868)	875
Total other comprehensive income (loss), net of tax	542	747	(9,926)	1,430
Comprehensive (loss) income	$ (8,950)	$ 10,601	$ (21,977)	$ 11,155