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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenue      
Product $ 326,786 $ 295,588 $ 297,310
Service 27,100 28,691 24,604
Total revenue 353,886 324,279 321,914
Cost of revenue      
Product 71,893 65,432 64,732
Service 12,187 14,063 13,187
Total cost of revenue 84,080 79,495 77,919
Gross margin      
Product 254,893 230,156 232,578
Service 14,913 14,628 11,417
Total gross margin 269,806 244,784 243,995
Research, development, and engineering expenses 48,087 41,549 40,946
Selling, general, and administrative expenses 135,351 119,828 117,694
Operating income 86,368 83,407 85,355
Foreign currency loss (646) (880) (504)
Investment income 2,604 4,470 2,902
Other expense (440) (367) (636)
Income before income tax expense 87,886 86,630 87,117
Income tax expense 14,313 18,532 17,248
Net income $ 73,573 $ 68,098 $ 69,869
Net income per common and common-equivalent share:      
Basic $ 0.85 [1] $ 0.79 [1] $ 0.83 [1]
Diluted $ 0.83 [1] $ 0.78 [1] $ 0.82 [1]
Weighted-average common and common-equivalent shares outstanding:      
Basic 86,946 [1] 85,666 [1] 83,718 [1]
Diluted 88,901 [1] 87,280 [1] 85,524 [1]
Cash dividends per common share   $ 0.77 [1] $ 0.18 [1]
[1] Prior period results have been adjusted to reflect the two-for-one stock split effected in the form of a stock dividend which occurred in the third quarter of 2013.