Other Comprehensive Income Changes in accumulated other comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income/(Loss) [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax			$ 1,900
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, Tax, Attributable to Parent, Held-to-maturity Securities			(41,700)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax			6,800
Currency Translation Adjustment	$ (9,718)	$ 15,441	(29,879)	$ 44,897
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			(266,419)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(10,920)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(1,674)	$ 5,664	(6,554)	$ 14,838
Reclassification from accumulated other comprehensive income, current period, net of tax			229
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(9,559)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(275,978)		(275,978)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax			2,600
Stranded Tax Effects Reclassified from OCI to Retained Earnings	1,100		1,100
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income/(Loss) [Line Items]
Currency Translation Adjustment			(29,879)
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			(69,721)
Reclassification from accumulated other comprehensive income, current period, net of tax			0
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(29,879)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(99,600)		(99,600)
Stranded Tax Effects Reclassified from OCI to Retained Earnings	0		0
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			(203,063)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax			(7,041)
Reclassification from accumulated other comprehensive income, current period, net of tax			0
Other Comprehensive Income (Loss), before Reclassifications, before Tax			6,554
Accumulated Other Comprehensive Income (Loss), Net of Tax	(196,509)		(196,509)
Stranded Tax Effects Reclassified from OCI to Retained Earnings	487		487
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			6,365
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			11,918
Reclassification from accumulated other comprehensive income, current period, net of tax			229
Other Comprehensive Income (Loss), before Reclassifications, before Tax			13,766
Accumulated Other Comprehensive Income (Loss), Net of Tax	20,131		20,131
Stranded Tax Effects Reclassified from OCI to Retained Earnings	$ (1,619)		$ (1,619)