Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Net Sales	$ 201,183	$ 186,915	$ 396,092	$ 364,992
Operating Earnings, Excluding Indirect Operating Expenses	40,714	40,609	81,637	78,133
Reconciliation from Segment Totals to Consolidated [Abstract]
Combination-related expenses	(4,338)	0	(13,413)	0
Indirect Operating Expenses	(16,642)	(16,096)	(32,959)	(32,005)
Amortization	(1,831)	(1,812)	(3,604)	(3,589)
Operating income	17,903	22,701	31,661	42,539
Other expense, net	(1,571)	(337)	(1,676)	(235)
Interest Expense	(780)	(727)	(1,436)	(1,468)
Interest Income	540	545	1,063	893
Income Before Taxes and Equity in Net Income of Associated Companies	16,092	22,182	29,612	41,729
North America [Member]
Segment Reporting Information [Line Items]
Net Sales	90,331	83,088	177,672	165,460
Operating Earnings, Excluding Indirect Operating Expenses	19,621	20,255	40,258	38,937
North America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	2,500	1,900	4,600	3,800
EMEA [Member]
Segment Reporting Information [Line Items]
Net Sales	54,507	53,108	108,434	100,757
Operating Earnings, Excluding Indirect Operating Expenses	8,217	8,936	17,463	17,045
EMEA [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	5,000	3,900	9,800	7,800
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Sales	47,724	43,151	92,874	84,663
Operating Earnings, Excluding Indirect Operating Expenses	11,812	11,080	22,055	22,128
Asia Pacific [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	100	100	100	300
South America [Member]
Segment Reporting Information [Line Items]
Net Sales	8,621	7,568	17,112	14,112
Operating Earnings, Excluding Indirect Operating Expenses	1,064	338	1,861	23
South America [Member] | Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 100	$ 100	$ 100	$ 100