Other Comprehensive Income Changes in accumulated other comprehensive income (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
Accumulated Other Comprehensive Income/(Loss) [Line Items]
Currency Translation Adjustment	$ (13,167)	$ 6,559	$ (9,737)	$ (1,406)
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			(8,635)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(9,656)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(33)	16	14	(224)
Reclassification from accumulated other comprehensive income, current period, net of tax			465
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(9,191)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(17,826)		(17,826)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income/(Loss) [Line Items]
Currency Translation Adjustment			(9,737)
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			(5,885)
Reclassification from accumulated other comprehensive income, current period, net of tax			0
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(9,737)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(15,622)		(15,622)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			(2,120)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax			(14)
Reclassification from accumulated other comprehensive income, current period, net of tax			0
Other Comprehensive Income (Loss), before Reclassifications, before Tax			14
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,106)		(2,106)
Interest Rate Swap [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			(630)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			67
Reclassification from accumulated other comprehensive income, current period, net of tax			465
Other Comprehensive Income (Loss), before Reclassifications, before Tax			532
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (98)		$ (98)