Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Net sales	$ 205,869	$ 221,962	$ 417,079	$ 434,017
Operating Earnings, Excluding Indirect Operating Expenses	43,495	48,068	87,428	91,503
Reconciliation from Segment Totals to Consolidated [Abstract]
Combination and other acquisition-related expenses	(4,604)	(4,291)	(9,087)	(9,500)
Non-operating charges	(16,533)	(19,344)	(34,266)	(35,383)
Depreciation of corporate assets and amortization	(1,827)	(1,870)	(3,715)	(3,826)
Operating income	20,531	22,563	40,360	42,794
Other income (expense), net	43	261	(592)	(108)
Interest Expense	(1,283)	(1,602)	(2,497)	(3,294)
Interest Income	550	571	988	1,060
Income Before Taxes and Equity in Net Income of Associated Companies	19,841	21,793	38,259	40,452
North America [Member]
Segment Reporting Information [Line Items]
Net sales	94,383	97,392	189,636	189,212
Operating Earnings, Excluding Indirect Operating Expenses	20,547	23,237	41,419	43,602
North America [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	1,400	1,800	3,200	4,800
EMEA [Member]
Segment Reporting Information [Line Items]
Net sales	53,150	60,166	109,438	122,221
Operating Earnings, Excluding Indirect Operating Expenses	9,043	9,096	17,825	19,389
EMEA [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	4,800	5,400	10,100	11,000
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales	49,827	55,348	100,354	104,125
Operating Earnings, Excluding Indirect Operating Expenses	12,685	14,621	25,767	26,763
Asia Pacific [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	100	100	100	400
South America [Member]
Segment Reporting Information [Line Items]
Net sales	8,509	9,056	17,651	18,459
Operating Earnings, Excluding Indirect Operating Expenses	1,220	1,114	2,417	1,749
South America [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	$ 100	$ 100	$ 100	$ 100