CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Net Sales	$ 188,541	$ 178,268	$ 556,871	$ 551,473
Cost of Sales	106,679	100,705	314,745	309,640
Gross Profit	81,862	77,563	242,126	241,833
Operating Expense:
Research and Development Expense	7,970	7,353	23,309	21,558
Selling and Administrative Expense	57,663	57,193	174,083	177,326
Gain on Sale of Business	0	(784)	0	(784)
Total Operating Expense	65,633	63,762	197,392	198,100
Profit from Operations	16,229	13,801	44,734	43,733
Other Income (Expense):
Interest Income	67	229	295	871
Interest Expense	(440)	(640)	(1,318)	(2,021)
Net Foreign Currency Transaction Losses	(303)	(385)	(1,046)	(1,496)
Other (Expense) Income, Net	(157)	99	(238)	175
Total Other Expense, Net	(833)	(697)	(2,307)	(2,471)
Profit Before Income Taxes	15,396	13,104	42,427	41,262
Income Tax Expense	4,779	4,359	12,497	13,522
Net Earnings	$ 10,617	$ 8,745	$ 29,930	$ 27,740
Earnings per Share:
Basic	$ 0.58	$ 0.47	$ 1.64	$ 1.49
Diluted	$ 0.56	$ 0.46	$ 1.59	$ 1.45
Weighted Average Shares Outstanding:
Basic	18,267,828	18,468,546	18,288,083	18,594,508
Diluted	18,811,638	19,040,875	18,823,745	19,154,844
Cash Dividend Declared per Common Share	$ 0.18	$ 0.17	$ 0.54	$ 0.51