Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Net Sales	$ 189,224	$ 198,867	$ 554,280	$ 571,827
Operating Earnings, Excluding Indirect Operating Expenses	40,510	39,168	116,620	111,489
Reconciliation from Segment Totals to Consolidated [Abstract]
Indirect Operating Expenses	(20,031)	(17,489)	(53,585)	(47,864)
Amortization	(1,751)	(1,126)	(4,998)	(2,754)
Operating income	18,728	20,553	58,037	60,871
Other income (expense), net	185	914	(97)	558
Interest Expense	(697)	(641)	(1,891)	(1,747)
Interest Income	422	642	1,117	1,990
Income Before Taxes and Equity in Net Income of Associated Companies	18,638	21,468	57,166	61,672
North America [Member]
Segment Reporting Information [Line Items]
Net Sales	90,010	87,909	258,977	247,137
Operating Earnings, Excluding Indirect Operating Expenses	21,893	17,771	59,938	51,350
North America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	2,250	2,605	6,885	6,411
EMEA [Member]
Segment Reporting Information [Line Items]
Net Sales	45,989	49,352	130,345	148,769
Operating Earnings, Excluding Indirect Operating Expenses	7,106	8,589	20,538	24,794
EMEA [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	5,185	5,801	14,559	16,582
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Sales	46,067	49,601	138,913	136,661
Operating Earnings, Excluding Indirect Operating Expenses	11,250	11,925	33,874	32,064
Asia Pacific [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	267	127	523	329
South America [Member]
Segment Reporting Information [Line Items]
Net Sales	7,158	12,005	26,045	39,260
Operating Earnings, Excluding Indirect Operating Expenses	261	883	2,270	3,281
South America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 0	$ 0	$ 13	$ 0