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Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net revenues:        
Products $ 179,441 $ 158,520 $ 553,818 $ 497,172
Services 29,891 28,278 87,319 80,676
Total net revenues 209,332 186,798 641,137 577,848
Cost of revenues:        
Cost of products 95,710 89,181 294,211 276,905
Cost of services 19,393 18,292 56,853 52,611
Total cost of revenues (exclusive of amortization shown separately below) 115,103 107,473 351,064 329,516
Gross profit 94,229 79,325 290,073 248,332
Research and development 17,217 15,827 51,464 46,866
Selling, general and administrative 33,396 32,365 97,532 99,195
Acquisition costs     30 499
Restructuring 562 1,223 1,569 1,970
Amortization of intangible assets 1,691 1,760 5,071 3,214
Income from operations 41,363 28,150 134,407 96,588
Interest income 778 399 2,147 895
Interest expense 57 5 132 35
Income before income taxes 42,084 28,544 136,422 97,448
Provision (benefit) for income taxes 12,315 (573) 39,647 15,862
Net income 29,769 29,117 96,775 81,586
Other comprehensive income (loss):        
Changes in value of financial instruments designated as cash flow hedges, net of tax expense [1] 939 1,302 2 458
Foreign currency translation adjustments, net of tax of $0 (3,623) (9,598) (6,217) (7,604)
Unrealized gain (loss) on investments, net of tax expense (benefit) [2] 100 (71) 16 (29)
Total comprehensive income $ 27,185 $ 20,750 $ 90,576 $ 74,411
Net income per share:        
Basic $ 0.56 $ 0.55 $ 1.82 $ 1.53
Diluted 0.56 0.55 1.81 1.52
Cash dividends per common share $ 0.170 $ 0.165 $ 0.505 $ 0.490
Weighted average common shares outstanding:        
Basic 53,314 53,054 53,304 53,276
Diluted 53,568 53,310 53,562 53,541
[1] Tax expense was $548 and $671 for the three months ended September 30, 2015 and 2014, respectively. Tax expense was $20 and $134 for the nine months ended September 30, 2015 and 2014, respectively.
[2] Tax expense (benefit) was $59 and $(37) for the three months ended September 30, 2015 and 2014, respectively. Tax expense (benefit) was $221 and $(8) for the nine months ended September 30, 2015 and 2014, respectively.