Consolidated Statements of Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Earnings [Abstract]
Net Sales	$ 808,572	$ 811,799	$ 821,983
Cost of Sales	456,977	462,739	469,556
Gross Profit	351,595	349,060	352,427
Operating Expense:
Research and Development Expense	34,738	32,415	29,432
Selling and Administrative Expense	248,210	252,270	250,898
Impairment of Long-Lived Assets	0	11,199	0
Loss on Sale of Business	(149)	0	0
Total Operating Expense	283,097	295,884	280,330
Profit from Operations	68,498	53,176	72,097
Other Income (Expense):
Interest Income	330	172	302
Interest Expense	(1,279)	(1,313)	(1,722)
Net Foreign Currency Transaction Losses	(392)	(954)	(690)
Other Expense, Net	(666)	(657)	(449)
Total Other Expense, Net	(2,007)	(2,752)	(2,559)
Profit Before Income Taxes	66,491	50,424	69,538
Income Tax Expense	19,877	18,336	18,887
Net Earnings	$ 46,614	$ 32,088	$ 50,651
Net Earnings per Share:
Basic	$ 2.66	$ 1.78	$ 2.78
Diluted	$ 2.59	$ 1.74	$ 2.70
Weighted Average Shares Outstanding:
Basic	17,523,267	18,015,151	18,217,384
Diluted	17,976,183	18,493,447	18,740,858
Cash Dividends Declared per Common Share	$ 0.81	$ 0.80	$ 0.78