Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net Sales	$ 212,918	$ 190,428	$ 609,010	$ 555,420
Operating Earnings, Excluding Indirect Operating Expenses	42,678	41,154	124,315	119,287
Reconciliation from Segment Totals to Consolidated [Abstract]
Combination-related expenses	(9,675)	(1,157)	(23,088)	(1,157)
Indirect Operating Expenses	(17,108)	(16,404)	(50,067)	(48,409)
Amortization	(1,886)	(1,730)	(5,490)	(5,319)
Operating income	14,009	21,863	45,670	64,402
Other Income (Expense), Net	249	(10)	(1,427)	(245)
Interest Expense	(793)	(758)	(2,229)	(2,226)
Interest Income	762	551	1,825	1,444
Income Before Taxes and Equity in Net Income of Associated Companies	14,227	21,646	43,839	63,375
North America [Member]
Segment Reporting Information [Line Items]
Net Sales	90,450	86,126	268,122	251,586
Operating Earnings, Excluding Indirect Operating Expenses	18,888	20,397	59,146	59,334
North America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	2,800	2,500	7,400	6,300
EMEA [Member]
Segment Reporting Information [Line Items]
Net Sales	58,775	49,825	167,209	150,582
Operating Earnings, Excluding Indirect Operating Expenses	8,862	8,340	26,325	25,385
EMEA [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	6,200	5,300	16,000	13,200
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Sales	54,200	45,892	147,074	130,555
Operating Earnings, Excluding Indirect Operating Expenses	13,963	11,737	36,018	33,865
Asia Pacific [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	200	100	300	500
South America [Member]
Segment Reporting Information [Line Items]
Net Sales	9,493	8,585	26,605	22,697
Operating Earnings, Excluding Indirect Operating Expenses	965	680	2,826	703
South America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 100	$ 100	$ 100	$ 100