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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net sales $ 181,703 $ 177,812 $ 340,437 $ 310,348
Cost of sales 98,557 94,313 187,886 169,900
Gross profit 83,146 83,499 152,551 140,448
Operating expenses:        
Research and development and other engineering 9,043 6,945 18,240 12,939
Selling 19,881 19,819 40,314 36,895
General and administrative 27,087 25,454 53,331 47,076
Loss (gain) on sale of assets (13) 73 10 48
Total operating expenses 55,998 52,291 111,895 96,958
Income from operations 27,148 31,208 40,656 43,490
Loss in equity method investment, before tax   (69)   (82)
Interest income, net 58 108 123 179
Income before taxes 27,206 31,247 40,779 43,587
Provision for income taxes 11,347 11,754 17,719 17,016
Net income $ 15,859 $ 19,493 $ 23,060 $ 26,571
Earnings per common share:        
Basic (in dollars per share) $ 0.33 $ 0.39 $ 0.48 $ 0.53
Diluted (in dollars per share) $ 0.33 $ 0.39 $ 0.48 $ 0.53
Number of shares outstanding        
Basic (in shares) 48,340 49,404 48,307 49,753
Diluted (in shares) 48,419 49,456 48,378 49,809
Cash dividends declared per common share (in dollars per share) $ 0.125 $ 0.125 $ 0.25 $ 0.25