Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 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			(10,075)	(9,444)
Reclassifications out of accumulated other comprehensive loss			11	478
Balance at the end of the period	(27,980)	(26,213)	(27,980)	(26,213)
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			(10,075)	(9,444)
Reclassifications out of accumulated other comprehensive loss			0	0
Balance at the end of the period	(24,478)	(3,404)	(24,478)	(3,404)
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			11	478
Balance at the end of the period	(3,502)	(22,809)	(3,502)	(22,809)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized prior service costs	(5)	(5)	(17)	(15)
Amortization of unrecognized cumulative actuarial net loss	3	202	9	568
Total before tax	8	207	26	583
Tax Expense (Benefit)	(5)	(34)	(15)	(105)
Net of tax	$ 3	$ 173	$ 11	$ 478