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CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Statement [Abstract]    
Net Sales $ 168,092 $ 173,712
Cost of Sales 95,569 98,393
Gross Profit 72,523 75,319
Operating Expense:    
Research and Development Expense 7,518 7,270
Selling and Administrative Expense 58,122 59,714
Total Operating Expense 65,640 66,984
Profit from Operations 6,883 8,335
Other Income (Expense):    
Interest Income 114 310
Interest Expense (467) (712)
Net Foreign Currency Transaction Losses (324) (230)
Other Income, Net 6 35
Total Other Expense, Net (671) (597)
Profit Before Income Taxes 6,212 7,738
Income Tax Expense 1,153 2,414
Net Earnings $ 5,059 $ 5,324
Earnings per Share:    
Basic $ 0.28 $ 0.28
Diluted $ 0.27 $ 0.28
Weighted Average Shares Outstanding:    
Basic 18,343,933 18,722,156
Diluted 18,889,317 19,228,272
Cash Dividend Declared per Common Share $ 0.18 $ 0.17