Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Net Sales	$ 183,726	$ 191,286	$ 365,056	$ 372,960
Operating Earnings, Excluding Indirect Operating Expenses	40,028	37,087	76,110	72,321
Reconciliation from Segment Totals to Consolidated [Abstract]
Indirect Operating Expenses	(16,963)	(15,327)	(33,554)	(30,375)
Amortization	(1,620)	(815)	(3,247)	(1,628)
Operating income	21,445	20,945	39,309	40,318
Other (expense) income, net	(88)	117	(282)	(356)
Interest Expense	(607)	(581)	(1,194)	(1,106)
Interest Income	375	895	695	1,348
Income Before Taxes and Equity in Net Income of Associated Companies	21,125	21,376	38,528	40,204
North America [Member]
Segment Reporting Information [Line Items]
Net Sales	85,965	82,512	168,967	159,228
Operating Earnings, Excluding Indirect Operating Expenses	20,220	17,868	38,045	33,579
North America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	2,615	1,856	4,635	3,806
EMEA [Member]
Segment Reporting Information [Line Items]
Net Sales	41,171	50,228	84,356	99,417
Operating Earnings, Excluding Indirect Operating Expenses	6,861	8,109	13,432	16,205
EMEA [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	4,595	5,455	9,374	10,781
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Sales	47,846	45,123	92,846	87,060
Operating Earnings, Excluding Indirect Operating Expenses	12,190	10,221	22,624	20,139
Asia Pacific [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	162	95	256	202
South America [Member]
Segment Reporting Information [Line Items]
Net Sales	8,744	13,423	18,887	27,255
Operating Earnings, Excluding Indirect Operating Expenses	757	889	2,009	2,398
South America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 4	$ 0	$ 13	$ 0