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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenue      
Product $ 297,310 $ 263,463 $ 158,379
Service 24,604 27,228 17,348
Total revenue 321,914 290,691 175,727
Cost of revenue      
Product 64,732 61,497 45,026
Service 13,187 16,091 11,361
Total cost of revenue 77,919 77,588 56,387
Gross margin      
Product 232,578 201,966 113,353
Service 11,417 11,137 5,987
Total gross margin 243,995 213,103 119,340
Research, development, and engineering expenses 40,946 33,080 31,132
Selling, general, and administrative expenses 117,694 104,235 96,350
Restructuring charges (Note 17)   75 4,526
Operating income (loss) 85,355 75,713 (12,668)
Foreign currency loss (504) (328) (1,265)
Investment income 2,902 1,421 2,185
Other income (expense) (636) (703) 1,372
Income (loss) before income tax expense (benefit) 87,117 76,103 (10,376)
Income tax expense (benefit) 17,248 14,722 (5,507)
Net income (loss) $ 69,869 $ 61,381 $ (4,869)
Net income (loss) per common and common-equivalent shares:      
Basic $ 1.67 $ 1.54 $ (0.12)
Diluted $ 1.63 $ 1.52 $ (0.12)
Weighted-average common and common-equivalent shares outstanding:      
Basic 41,859 39,924 39,659
Diluted 42,762 40,297 39,659
Cash dividends per common share $ 0.36 $ 0.25 $ 0.30