Pensions and Other Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2020	Jun. 29, 2019	Jul. 04, 2020	Jun. 29, 2019
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	341	424	683	848
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	36	36	72	72
Amortization of losses (gains)	297	118	595	236
Curtailment and settlement losses	0	0	0	0
Net periodic benefit cost	674	578	1,350	1,156
Defined Benefit Pension Plans [Member] | Non-U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	1,071	845	2,145	1,697
Interest cost	919	1,281	1,843	2,572
Expected return on plan assets	(491)	(489)	(986)	(979)
Amortization of prior service cost (credit)	30	50	60	101
Amortization of losses (gains)	1,588	1,344	3,180	2,703
Curtailment and settlement losses	231	500	460	1,005
Net periodic benefit cost	3,348	3,531	6,702	7,099
Other Postretirement Benefits [Member] | U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	28	35	56	70
Interest cost	59	78	118	155
Amortization of losses (gains)	6	(32)	13	(64)
Net periodic benefit cost	93	81	187	161
Other Postretirement Benefits [Member] | Non-U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	68	72	137	144
Interest cost	16	30	31	60
Amortization of losses (gains)	31	27	62	54
Net periodic benefit cost	$ 115	$ 129	$ 230	$ 258