CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - UNAUDITED (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Translation adjustment, tax expense (benefit)	$ 430	$ 444	$ 32	$ 508
Amortization of prior service cost included in net periodic pension costs, tax	53	59	171	177
Amortization of loss included in net periodic pension costs, tax	792	612	2,340	1,818
Additional cost due to early retirement, net of tax	0	0	0	110
Foreign exchange impact, tax expense (benefit)	74	58	2	67
Unrealized holding gains arising during period, tax	168	278	144	603
Reclassification adjustments for losses included in net earnings, tax	$ 31	$ 0	$ 92	$ 0