Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 211,210	$ 212,055
Operating earnings, excluding indirect operating expenses	43,933	43,435
Reconciliation from Segment Totals to Consolidated [Abstract]
Combination-related expenses	(4,483)	(5,209)
Nonoperating charges	(17,733)	(16,039)
Depreciation of corporate assets and amortization	(1,888)	(1,956)
Operating income	19,829	20,231
Other expense, net	(635)	(369)
Interest expense	(1,214)	(1,692)
Interest income	438	489
Income before taxes and equity in net income (loss) of associated companies	18,418	18,659
North America [Member]
Segment Reporting Information [Line Items]
Net sales	95,253	91,820
Operating earnings, excluding indirect operating expenses	20,872	20,365
North America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	1,800	3,100
EMEA [Member]
Segment Reporting Information [Line Items]
Net sales	56,288	62,055
Operating earnings, excluding indirect operating expenses	8,782	10,293
EMEA [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	5,300	5,600
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales	50,527	48,777
Operating earnings, excluding indirect operating expenses	13,082	12,142
Asia Pacific [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	100	400
South America [Member]
Segment Reporting Information [Line Items]
Net sales	9,142	9,403
Operating earnings, excluding indirect operating expenses	1,197	635
South America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	$ 100	$ 0