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Condensed Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Revenues:        
Products $ 198,827 $ 187,437 $ 560,742 $ 536,781
Services 42,923 37,287 115,396 103,129
Total revenues 241,750 224,724 676,138 639,910
Cost and expenses:        
Products 113,642 113,184 309,181 323,169
Services 21,608 18,947 61,849 58,493
Total cost of sales 135,250 132,131 371,030 381,662
Selling, general and administrative 20,845 29,830 70,300 68,732
Engineering and product development 12,663 10,778 34,295 29,139
Total costs and expenses 168,758 172,739 475,625 479,533
Operating income 72,992 51,985 200,513 160,377
Interest income 206 203 555 486
Interest expense (3) (4) (15) (24)
Income before income taxes 73,195 52,184 201,053 160,839
Income tax provision 17,512 12,189 51,428 38,075
Net income $ 55,683 $ 39,995 $ 149,625 $ 122,764
Earnings per common share:        
Basic $ 1.41 $ 0.98 $ 3.72 $ 3.02
Diluted $ 1.40 $ 0.98 $ 3.70 $ 3.01
Weighted average common shares outstanding:        
Basic 39,630 40,683 40,208 40,617
Diluted 39,880 40,911 40,444 40,821