Other Comprehensive Income Changes in accumulated other comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Accumulated Other Comprehensive Income/(Loss) [Line Items]
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, Tax, Attributable to Parent, Held-to-maturity Securities			$ (39,900)
Currency Translation Adjustment	$ 18,621	$ (19,579)	29,456	$ (19,975)
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			(284,323)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			20,587
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	6,647	$ (1,078)	9,174	(4,856)
Reclassification from accumulated other comprehensive income, current period, net of tax			(806)
Other Comprehensive Income (Loss), before Reclassifications, before Tax			19,781
Accumulated Other Comprehensive Income (Loss), Net of Tax	(264,542)		(264,542)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income/(Loss) [Line Items]
Currency Translation Adjustment			29,456
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			(116,411)
Reclassification from accumulated other comprehensive income, current period, net of tax			0
Other Comprehensive Income (Loss), before Reclassifications, before Tax			29,456
Accumulated Other Comprehensive Income (Loss), Net of Tax	(86,955)		(86,955)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			(173,394)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax			9,174
Reclassification from accumulated other comprehensive income, current period, net of tax			0
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(9,174)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(182,568)		(182,568)
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			5,482
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			305
Reclassification from accumulated other comprehensive income, current period, net of tax			(806)
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(501)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 4,981		$ 4,981
Lynx [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Business Combination, Provisional Information Adjustment, Working Capital				$ 3,300