Condensed Consolidated Statements of Comprehensive (Loss)/Earnings (Parenthetical) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Condensed Consolidated Statements of Comprehensive (Loss)/Earnings [Abstract]
Translation adjustment, tax expense (benefit)	$ 71	$ 272	$ 463	$ 64
Amortization of prior service cost included in net periodic pension costs, tax	59	59	118	118
Amortization of loss included in net periodic pension costs, tax	774	600	1,548	1,206
Additional cost due to early retirement, net of tax	0	110	0	110
Foreign exchange impact, tax expense (benefit)	2	33	72	9
Unrealized holding gains arising during period, tax	298	325	312	325
Reclassification adjustments for losses included in net earnings, tax	$ 31	$ 0	$ 61	$ 0