CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Statement [Abstract]
Net Sales	$ 178,268	$ 186,990	$ 551,473	$ 560,839
Cost of Sales	100,705	106,737	309,640	325,188
Gross Profit	77,563	80,253	241,833	235,651
Operating Expense:
Research and Development Expense	7,353	7,240	21,558	20,236
Selling, General and Administrative Expense	57,193	57,250	177,326	181,222
Gain on Sale of Business	(784)	0	(784)	0
Total Operating Expense	63,762	64,490	198,100	201,458
Profit from Operations	13,801	15,763	43,733	34,193
Other Income (Expense):
Interest Income	229	224	871	476
Interest Expense	(640)	(654)	(2,021)	(1,614)
Net Foreign Currency Transaction (Losses) Gains	(385)	(1,390)	(1,496)	49
Other Income (Expense), Net	99	0	175	(33)
Total Other (Expense) Income, Net	(697)	(1,820)	(2,471)	(1,122)
Profit Before Income Taxes	13,104	13,943	41,262	33,071
Income Tax Expense	4,359	4,215	13,522	11,622
Net Earnings	$ 8,745	$ 9,728	$ 27,740	$ 21,449
Earnings per Share:
Basic	$ 0.47	$ 0.52	$ 1.49	$ 1.14
Diluted	$ 0.46	$ 0.50	$ 1.45	$ 1.10
Weighted Average Shares Outstanding:
Basic	18,468,546	18,741,524	18,594,508	18,881,132
Diluted	19,040,875	19,271,074	19,154,844	19,417,061
Cash Dividend Declared per Common Share	$ 0.17	$ 0.17	$ 0.51	$ 0.51