Consolidated Statements of Earnings (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements of Earnings [Abstract]
Net Sales	$ 821,983	$ 752,011	$ 738,980
Cost of Sales	469,556	426,103	413,684
Gross Profit	352,427	325,908	325,296
Operating Expense:
Research and Development Expense	29,432	30,529	29,263
Selling and Administrative Expense	250,898	232,976	234,114
Gain on Sale of Business	0	0	(784)
Total Operating Expense	280,330	263,505	262,593
Profit from Operations	72,097	62,403	62,703
Other Income (Expense):
Interest Income	302	390	1,069
Interest Expense	(1,722)	(1,761)	(2,517)
Net Foreign Currency Transaction Losses	(690)	(671)	(1,403)
Other (Expense) Income, Net	(449)	(483)	38
Total Other Expense, Net	(2,559)	(2,525)	(2,813)
Profit Before Income Taxes	69,538	59,878	59,890
Income Tax Expense	18,887	19,647	18,306
Net Earnings	$ 50,651	$ 40,231	$ 41,584
Net Earnings per Share:
Basic	$ 2.78	$ 2.20	$ 2.24
Diluted	$ 2.70	$ 2.14	$ 2.18
Weighted Average Shares Outstanding:
Basic	18,217,384	18,297,371	18,544,896
Diluted	18,740,858	18,833,453	19,102,016
Cash Dividends Declared per Common Share	$ 0.78	$ 0.72	$ 0.69