Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidated Statements of Operations (Unaudited) [Abstract]
Net Sales	$ 186,990	$ 168,637	$ 560,839	$ 484,879
Cost of Sales	106,737	96,775	325,188	277,715
Gross Profit	80,253	71,862	235,651	207,164
Operating Expense:
Research and Development Expense	7,240	7,114	20,236	19,058
Selling and Administrative Expense	57,250	54,227	181,222	160,463
Total Operating Expense	64,490	61,341	201,458	179,521
Profit from Operations	15,763	10,521	34,193	27,643
Other Income (Expense):
Interest Income	224	52	476	129
Interest Expense	(654)	(390)	(1,614)	(1,219)
Net Foreign Currency Transaction (Losses) Gains	(1,390)	130	49	(432)
Other Income (Expense), Net	0	57	(33)	115
Total Other Expense, Net	(1,820)	(151)	(1,122)	(1,407)
Profit Before Income Taxes	13,943	10,370	33,071	26,236
Income Tax Expense	4,215	2,844	11,622	8,445
Net Earnings	$ 9,728	$ 7,526	$ 21,449	$ 17,791
Basic Earnings Per Share	$ 0.52	$ 0.40	$ 1.14	$ 0.95
Diluted Earnings Per Share	$ 0.50	$ 0.39	$ 1.10	$ 0.92
Basic Weighted Average Shares Outstanding	18,741,524	18,873,249	18,881,132	18,782,404
Diluted Weighted Average Shares Outstanding	19,271,074	19,402,902	19,417,061	19,299,783
Cash Dividend Declared per Common Share	$ 0.17	$ 0.14	$ 0.51	$ 0.42