Pensions and Other Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
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	424	371	848	742
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	36	36	72	72
Amortization of losses (gains)	118	159	236	318
Curtailment and settlement losses	0	0	0	0
Net periodic benefit cost	578	566	1,156	1,132
Defined Benefit Pension Plans [Member] | Non-U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	845	927	1,697	1,875
Interest cost	1,281	1,211	2,572	2,453
Expected return on plan assets	(489)	(479)	(979)	(967)
Amortization of prior service cost (credit)	50	54	101	109
Amortization of losses (gains)	1,344	1,566	2,703	3,170
Curtailment and settlement losses	500	455	1,005	917
Net periodic benefit cost	3,531	3,734	7,099	7,557
Other Postretirement Benefits [Member] | U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	35	34	70	68
Interest cost	78	68	155	136
Amortization of prior service cost (credit)	0	(37)	0	(74)
Amortization of losses (gains)	(32)	(9)	(64)	(19)
Net periodic benefit cost	81	56	161	111
Other Postretirement Benefits [Member] | Non-U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	72	73	144	148
Interest cost	30	28	60	58
Amortization of prior service cost (credit)	0	0	0	0
Amortization of losses (gains)	27	27	54	54
Net periodic benefit cost	$ 129	$ 128	$ 258	$ 260