Pensions and Other Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jul. 04, 2020	Jul. 03, 2021	Jul. 04, 2020
Defined Benefit Pension Plans [Member] | U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	254	341	508	683
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	36	36	72	72
Amortization of losses (gains)	446	297	893	595
Curtailment and settlement losses	0	0	0	0
Net periodic benefit cost	736	674	1,473	1,350
Defined Benefit Pension Plans [Member] | Non-U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	1,191	1,071	2,381	2,145
Interest cost	754	919	1,508	1,843
Expected return on plan assets	(419)	(491)	(836)	(986)
Amortization of prior service cost (credit)	50	30	101	60
Amortization of losses (gains)	1,887	1,588	3,771	3,180
Curtailment and settlement losses	202	231	401	460
Net periodic benefit cost	3,665	3,348	7,326	6,702
Other Postretirement Benefits [Member] | U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	26	28	51	56
Interest cost	41	59	82	118
Amortization of losses (gains)	13	6	26	13
Net periodic benefit cost	80	93	159	187
Other Postretirement Benefits [Member] | Non-U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	70	68	141	137
Interest cost	11	16	22	31
Amortization of losses (gains)	30	31	59	62
Net periodic benefit cost	$ 111	$ 115	$ 222	$ 230