Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net Sales	$ 222,022	$ 212,918	$ 656,039	$ 609,010
Operating Earnings, Excluding Indirect Operating Expenses	49,110	42,678	140,613	124,315
Reconciliation from Segment Totals to Consolidated [Abstract]
Combination-related expenses	(2,904)	(9,675)	(12,404)	(23,088)
Indirect Operating Expenses	(19,460)	(17,108)	(54,971)	(50,067)
Amortization	(1,827)	(1,886)	(5,525)	(5,490)
Operating income	24,919	14,009	67,713	45,670
Other (expense) income, net	(523)	249	(631)	(1,427)
Interest Expense	(1,510)	(793)	(4,804)	(2,229)
Interest Income	521	762	1,581	1,825
Income Before Taxes and Equity in Net Income of Associated Companies	23,407	14,227	63,859	43,839
North America [Member]
Segment Reporting Information [Line Items]
Net Sales	101,706	90,450	290,918	268,122
Operating Earnings, Excluding Indirect Operating Expenses	24,558	18,888	68,160	59,146
EMEA [Member]
Segment Reporting Information [Line Items]
Net Sales	55,498	58,775	177,719	167,209
Operating Earnings, Excluding Indirect Operating Expenses	8,577	8,862	27,966	26,325
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Sales	55,757	54,200	159,882	147,074
Operating Earnings, Excluding Indirect Operating Expenses	14,761	13,963	41,524	36,018
South America [Member]
Segment Reporting Information [Line Items]
Net Sales	9,061	9,493	27,520	26,605
Operating Earnings, Excluding Indirect Operating Expenses	$ 1,214	$ 965	$ 2,963	$ 2,826