Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Net Sales	$ 184,059	$ 180,923	$ 545,098	$ 535,358
Operating Earnings, Excluding Indirect Operating Expenses	35,796	29,866	108,012	96,997
Reconciliation from Segment Totals to Consolidated [Abstract]
Indirect Operating Expenses	(16,131)	(13,185)	(49,380)	(45,166)
Amortization	(858)	(818)	(2,621)	(2,283)
Operating income	18,807	15,863	56,011	49,548
Other (Expense) Income, Net	(685)	322	1,962	529
Interest Expense	(717)	(1,034)	(2,223)	(3,359)
Interest Income	267	149	665	409
Income Before Taxes and Equity in Net Income of Associated Companies	17,672	15,300	56,415	47,127
North America [Member]
Segment Reporting Information [Line Items]
Net Sales	79,602	78,690	231,111	236,079
Operating Earnings, Excluding Indirect Operating Expenses	15,203	13,650	46,238	44,959
North America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	2,413	3,063	7,704	8,596
EMEA [Member]
Segment Reporting Information [Line Items]
Net Sales	44,452	43,376	140,314	131,353
Operating Earnings, Excluding Indirect Operating Expenses	6,781	5,554	22,332	19,604
EMEA [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	5,771	4,726	15,427	11,895
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Sales	44,063	42,503	124,593	117,379
Operating Earnings, Excluding Indirect Operating Expenses	11,214	10,078	31,612	27,413
Asia Pacific [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	745	862	2,423	1,738
South America [Member]
Segment Reporting Information [Line Items]
Net Sales	15,942	16,354	49,080	50,547
Operating Earnings, Excluding Indirect Operating Expenses	2,598	584	7,830	5,021
South America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 0	$ 0	$ 0	$ 0