Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net Sales	$ 178,077	$ 181,330
Operating Earnings, Excluding Indirect Operating Expenses	37,418	36,082
Reconciliation from Segment Totals to Consolidated [Abstract]
Indirect Operating Expenses	(16,407)	(16,591)
Amortization	(1,777)	(1,627)
Operating income	19,234	17,864
Other income (expense), net	706	(194)
Interest Expense	(741)	(587)
Interest Income	348	320
Income Before Taxes and Equity in Net Income of Associated Companies	19,547	17,403
North America [Member]
Segment Reporting Information [Line Items]
Net Sales	82,372	83,002
Operating Earnings, Excluding Indirect Operating Expenses	18,632	17,825
North America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	1,800	2,000
EMEA [Member]
Segment Reporting Information [Line Items]
Net Sales	47,649	43,185
Operating Earnings, Excluding Indirect Operating Expenses	8,053	6,571
EMEA [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	3,900	4,800
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Sales	41,512	45,000
Operating Earnings, Excluding Indirect Operating Expenses	11,048	10,434
Asia Pacific [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	300	100
South America [Member]
Segment Reporting Information [Line Items]
Net Sales	6,544	10,143
Operating Earnings, Excluding Indirect Operating Expenses	(315)	1,252
South America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 100	$ 100