Pensions and Other Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Defined Benefit Pension Plans [Member] | U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	$ 0	$ 0
Interest cost	424	371
Expected return on plan assets	0	0
Amortization of prior service cost (credit)	36	36
Amortization of losses (gains)	118	159
Curtailment and settlement losses	0	0
Net periodic benefit cost	578	566
Defined Benefit Pension Plans [Member] | Non-U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	852	948
Interest cost	1,291	1,242
Expected return on plan assets	(490)	(488)
Amortization of prior service cost (credit)	51	55
Amortization of losses (gains)	1,359	1,604
Curtailment and settlement losses	505	462
Net periodic benefit cost	3,568	3,823
Other Postretirement Benefits [Member] | U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	35	34
Interest cost	77	68
Amortization of prior service cost (credit)	0	(37)
Amortization of losses (gains)	(32)	(10)
Net periodic benefit cost	80	55
Other Postretirement Benefits [Member] | Non-U.S. Plans [Member]
Components of net periodic pension cost [Abstract]
Net service cost	72	75
Interest cost	30	30
Amortization of prior service cost (credit)	0	0
Amortization of losses (gains)	27	27
Net periodic benefit cost	$ 129	$ 132