Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Other Comprehensive Income (Loss), Before Tax [Roll Forward]
Balance at the beginning of the period			$ (17,916)	$ (17,247)
Other comprehensive loss before reclassifications			1,157	(15,272)
Reclassifications out of accumulated other comprehensive loss			8	305
Balance at the end of the period	(16,751)	(32,214)	(16,751)	(32,214)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, before Tax [Roll Forward]
Balance at the beginning of the period			(14,403)	6,040
Other comprehensive loss before reclassficiations			1,157	(15,272)
Reclassifications out of accumulated other comprehensive loss			0	0
Balance at the end of the period	(13,246)	(9,232)	(13,246)	(9,232)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax [Roll Forward]
Balance at the beginning of the period			(3,513)	(23,287)
Other comprehensive loss before reclassifications			0	0
Reclassfications out of accumulated other comprehensive loss			8	305
Balance at the end of the period	(3,505)	(22,982)	(3,505)	(22,982)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized prior service costs	(6)	(5)	(12)	(10)
Amortization of unrecognized cumulative actuarial net loss	3	182	6	366
Total before tax	9	187	18	376
Tax Expense (Benefit)	(4)	(35)	(10)	(71)
Net of tax	$ 5	$ 152	$ 8	$ 305