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Business Segments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Net Sales $ 194,909 $ 178,077
Operating Earnings, Excluding Indirect Operating Expenses 40,923 37,524
Reconciliation from Segment Totals to Consolidated [Abstract]    
Combination-related expenses (9,075) 0
Indirect Operating Expenses (16,317) (15,909)
Amortization (1,773) (1,777)
Operating income 13,758 19,838
Other (expense) income, net (105) 102
Interest Expense (656) (741)
Interest Income 523 348
Income Before Taxes and Equity in Net Income of Associated Companies 13,520 19,547
North America [Member]    
Segment Reporting Information [Line Items]    
Net Sales 87,341 82,372
Operating Earnings, Excluding Indirect Operating Expenses 20,637 18,682
North America [Member] | Intersegment Sales Elimination [Member]    
Segment Reporting Information [Line Items]    
Net Sales 2,100 1,800
EMEA [Member]    
Segment Reporting Information [Line Items]    
Net Sales 53,927 47,649
Operating Earnings, Excluding Indirect Operating Expenses 9,246 8,109
EMEA [Member] | Intersegment Sales Elimination [Member]    
Segment Reporting Information [Line Items]    
Net Sales 4,800 3,900
Asia Pacific [Member]    
Segment Reporting Information [Line Items]    
Net Sales 45,150 41,512
Operating Earnings, Excluding Indirect Operating Expenses 10,243 11,048
Asia Pacific [Member] | Intersegment Sales Elimination [Member]    
Segment Reporting Information [Line Items]    
Net Sales 100 300
South America [Member]    
Segment Reporting Information [Line Items]    
Net Sales 8,491 6,544
Operating Earnings, Excluding Indirect Operating Expenses 797 (315)
South America [Member] | Intersegment Sales Elimination [Member]    
Segment Reporting Information [Line Items]    
Net Sales $ 100 $ 100