Retirement Plans (Components Of Net Pension Benefit Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Pension Benefits | U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	$ 1,398	$ 1,967
Expected return on plan assets	2,747	2,742
Amortization	(43)	(129)
Net periodic benefit income	(1,306)	(646)
Pension Benefits | Non-U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	692	695
Interest cost	339	555
Expected return on plan assets	194	247
Amortization	(31)	(5)
Net periodic benefit income	868	1,008
Other Post-Retirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	66	93
Net periodic benefit income	$ 66	$ 93