Other Comprehensive Income Changes in accumulated other comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (276,476)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(4,713)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	5,263	$ 8,874
Reclassification from accumulated other comprehensive income, current period, net of tax	766
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(3,947)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(280,423)
Accumulated Other Comprehensive (income) Loss, Defined Benefit Plan, Tax	(38,100)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax	(600)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax	(1,400)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(3,200)
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, Tax, Attributable to Parent, Held-to-maturity Securities	1,383	1,758
Currency Translation Adjustment	10,683	$ 21,802
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(112,771)
Reclassification from accumulated other comprehensive income, current period, net of tax	0
Other Comprehensive Income (Loss), before Reclassifications, before Tax	10,683
Accumulated Other Comprehensive Income (Loss), Net of Tax	(102,088)
Currency Translation Adjustment	10,683
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(170,938)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	5,263
Reclassification from accumulated other comprehensive income, current period, net of tax	0
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(5,263)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(176,201)
Interest Rate Swap | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	7,233
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(10,133)
Reclassification from accumulated other comprehensive income, current period, net of tax	766
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(9,367)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (2,134)