Consolidated Statements of Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Consolidated Statements of Earnings [Abstract]
Net Sales	$ 811,799	$ 821,983	$ 752,011
Cost of Sales	462,739	469,556	426,103
Gross Profit	349,060	352,427	325,908
Operating Expense:
Research and Development Expense	32,415	29,432	30,529
Selling and Administrative Expense	252,270	250,898	232,976
Impairment of Long-Lived Assets	11,199	0	0
Total Operating Expense	295,884	280,330	263,505
Profit from Operations	53,176	72,097	62,403
Other Income (Expense):
Interest Income	172	302	390
Interest Expense	(1,313)	(1,722)	(1,761)
Net Foreign Currency Transaction Losses	(954)	(690)	(671)
Other Expense, Net	(657)	(449)	(483)
Total Other Expense, Net	(2,752)	(2,559)	(2,525)
Profit Before Income Taxes	50,424	69,538	59,878
Income Tax Expense	18,336	18,887	19,647
Net Earnings	$ 32,088	$ 50,651	$ 40,231
Net Earnings per Share:
Basic	$ 1.78	$ 2.78	$ 2.20
Diluted	$ 1.74	$ 2.70	$ 2.14
Weighted Average Shares Outstanding:
Basic	18,015,151	18,217,384	18,297,371
Diluted	18,493,447	18,740,858	18,833,453
Cash Dividends Declared per Common Share	$ 0.80	$ 0.78	$ 0.72