Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Net Sales	$ 186,915	$ 183,726	$ 364,992	$ 365,056
Operating Earnings, Excluding Indirect Operating Expenses	40,443	40,028	77,861	76,110
Reconciliation from Segment Totals to Consolidated [Abstract]
Indirect Operating Expenses	(16,538)	(16,963)	(32,945)	(33,554)
Amortization	(1,812)	(1,620)	(3,589)	(3,247)
Operating income	22,093	21,445	41,327	39,309
Other income (expense), net	271	(88)	977	(282)
Interest Expense	(727)	(607)	(1,468)	(1,194)
Interest Income	545	375	893	695
Income Before Taxes and Equity in Net Income of Associated Companies	22,182	21,125	41,729	38,528
North America [Member]
Segment Reporting Information [Line Items]
Net Sales	83,088	85,965	165,460	168,967
Operating Earnings, Excluding Indirect Operating Expenses	20,122	20,220	38,754	38,045
North America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	1,900	2,600	3,800	4,600
EMEA [Member]
Segment Reporting Information [Line Items]
Net Sales	53,108	41,171	100,757	84,356
Operating Earnings, Excluding Indirect Operating Expenses	8,903	6,861	16,956	13,432
EMEA [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	3,900	4,600	7,800	9,400
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Sales	43,151	47,846	84,663	92,846
Operating Earnings, Excluding Indirect Operating Expenses	11,080	12,190	22,128	22,624
Asia Pacific [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	100	200	300	300
South America [Member]
Segment Reporting Information [Line Items]
Net Sales	7,568	8,744	14,112	18,887
Operating Earnings, Excluding Indirect Operating Expenses	338	757	23	2,009
South America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 100	$ 100	$ 100	$ 100