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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenue $ 114,341 $ 105,563 $ 325,142 $ 302,169
Costs and expenses        
Cost of revenue 53,840 49,388 164,493 156,092
Selling, general and administrative 22,321 18,401 61,025 54,166
Research and development 9,913 9,444 29,527 27,456
Total costs and expenses 86,074 77,233 255,045 237,714
Operating income 28,267 28,330 70,097 64,455
Equity in net income (loss) of affiliate (2,364) (2,290) 671 631
Income before interest and income tax expense 25,903 26,040 70,768 65,086
Interest income 15 6 46 20
Interest expense 133 109 394 377
Income before income tax expense 25,785 25,937 70,420 64,729
Income tax expense 9,998 10,586 26,863 25,547
Net income $ 15,787 $ 15,351 $ 43,557 $ 39,182
Income per weighted-average common share        
Basic $ 0.60 $ 0.56 $ 1.64 $ 1.44
Diluted $ 0.59 $ 0.55 $ 1.61 $ 1.42
Weighted-average common shares used in calculations        
Basic 26,133 27,222 26,564 27,154
Potentially dilutive securities 529 461 503 475
Diluted 26,662 27,683 27,067 27,629
Dividends declared per common share outstanding $ 0.10 $ 0.10 $ 0.30 $ 0.30