Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Net Sales	$ 198,867	$ 184,059	$ 571,827	$ 545,098
Operating Earnings, Excluding Indirect Operating Expenses	39,168	35,796	111,489	108,012
Reconciliation from Segment Totals to Consolidated [Abstract]
Indirect Operating Expenses	(17,489)	(16,131)	(47,864)	(49,380)
Amortization	(1,126)	(858)	(2,754)	(2,621)
Operating income	20,553	18,807	60,871	56,011
Other Income (Expense), net	914	(685)	558	1,962
Interest Expense	(641)	(717)	(1,747)	(2,223)
Interest Income	642	267	1,990	665
Income Before Taxes and Equity in Net Income of Associated Companies	21,468	17,672	61,672	56,415
North America [Member]
Segment Reporting Information [Line Items]
Net Sales	87,909	79,602	247,137	231,111
Operating Earnings, Excluding Indirect Operating Expenses	17,771	15,203	51,350	46,238
North America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	2,605	2,486	6,411	7,333
EMEA [Member]
Segment Reporting Information [Line Items]
Net Sales	49,352	44,452	148,769	140,314
Operating Earnings, Excluding Indirect Operating Expenses	8,589	6,781	24,794	22,332
EMEA [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	5,801	5,771	16,582	15,427
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Sales	49,601	44,063	136,661	124,593
Operating Earnings, Excluding Indirect Operating Expenses	11,925	11,214	32,064	31,612
Asia Pacific [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	127	58	329	363
South America [Member]
Segment Reporting Information [Line Items]
Net Sales	12,005	15,942	39,260	49,080
Operating Earnings, Excluding Indirect Operating Expenses	883	2,598	3,281	7,830
South America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 0	$ 0	$ 0	$ 0