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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (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:        
Product revenues $ 92,229 $ 75,508 $ 260,053 $ 220,325
Services and other revenues 20,314 18,531 59,306 54,510
Total revenues 112,543 94,039 319,359 274,835
Cost of revenues:        
Cost of product revenues 44,510 33,977 124,413 103,810
Cost of services and other revenues 8,487 8,022 24,865 24,250
Total cost of revenues 52,997 41,999 149,278 128,060
Gross profit 59,546 52,040 170,081 146,775
Operating expenses:        
Research and development 7,078 6,561 19,670 21,665
Selling, general and administrative 38,871 34,762 114,302 100,866
Total operating expenses 45,949 41,323 133,972 122,531
Income from operations 13,597 10,717 36,109 24,244
Interest and other income (expense), net (706) 25 (1,003) (134)
Income before provision for income taxes 12,891 10,742 35,106 24,110
Provision for income taxes 5,591 2,987 13,824 6,954
Net income $ 7,300 $ 7,755 $ 21,282 $ 17,156
Net income per share:        
Net income per share-basic (in dollars per share) $ 0.20 $ 0.22 $ 0.60 $ 0.50
Net income per share - diluted (in dollars per share) $ 0.20 $ 0.21 $ 0.58 $ 0.48
Weighted average shares outstanding:        
Basic (in shares) 35,994 35,133 35,634 34,499
Diluted (in shares) 36,832 36,190 36,617 35,466