Consolidated Statements of Earnings (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Earnings [Abstract]
Net Sales	$ 738,980	$ 753,998	$ 667,667
Cost of Sales	413,684	434,817	383,341
Gross Profit	325,296	319,181	284,326
Operating Expense:
Research and Development Expense	29,263	27,911	25,957
Selling and Administrative Expense	234,114	241,625	221,235
Gain on Sale of Business	(784)	0	0
Total Operating Expense	262,593	269,536	247,192
Profit from Operations	62,703	49,645	37,134
Other Income (Expense):
Interest Income	1,069	752	133
Interest Expense	(2,517)	(2,238)	(1,619)
Net Foreign Currency Transaction (Losses) Gains	(1,403)	559	(902)
Other Income (Expense), Net	38	12	(19)
Total Other Expense, Net	(2,813)	(915)	(2,407)
Profit Before Income Taxes	59,890	48,730	34,727
Income Tax Expense (Benefit)	18,306	16,017	(76)
Net Earnings	$ 41,584	$ 32,713	$ 34,803
Net Earnings per Share:
Basic	$ 2.24	$ 1.74	$ 1.85
Diluted	$ 2.18	$ 1.69	$ 1.80
Weighted Average Shares Outstanding:
Basic (in shares)	18,544,896	18,832,693	18,805,494
Diluted (in shares)	19,102,016	19,360,428	19,332,103
Cash Dividends Declared per Common Share	$ 0.69	$ 0.68	$ 0.59