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Consolidated Statements of Operations and Comprehensive Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Net revenues:        
Products $ 157,466 $ 132,541 $ 338,652 $ 249,152
Services 27,231 24,387 52,398 49,421
Total net revenues 184,697 156,928 391,050 298,573
Cost of revenues:        
Cost of products 87,513 79,206 187,724 149,781
Cost of services 17,549 15,764 34,319 32,132
Total cost of revenues 105,062 94,970 222,043 181,913
Gross profit 79,635 61,958 169,007 116,660
Research and development 15,421 16,813 31,039 32,061
Selling, general and administrative 32,239 34,849 66,830 68,982
Insurance reimbursement   (1,071)   (1,071)
Acquisition costs 271   499 171
Restructuring   198 747 238
Amortization of intangible assets 1,044 742 1,454 1,176
Income from operations 30,660 10,427 68,438 15,103
Interest income 243 234 495 539
Interest expense 12 23 29 37
Income before income taxes 30,891 10,638 68,904 15,605
Provision for income taxes 9,667 3,318 16,435 2,524
Net income 21,224 7,320 52,469 13,081
Other comprehensive income:        
Changes in value of financial instruments designated as cash flow hedges, net of tax (benefit) expense (682) [1] 56 [1] (845) [1] 1,076 [1]
Foreign currency translation adjustments, net of tax of $0 for the three months and six months ended June 30, 2014 and 2013 1,973 (836) 1,994 (9,175)
Unrealized gain (loss) on investments, net of tax expense (benefit) 7 [2] (36) [2] 43 [2] (61) [2]
Total comprehensive income $ 22,522 $ 6,504 $ 53,661 $ 4,921
Net income per share:        
Basic $ 0.40 $ 0.14 $ 0.98 $ 0.25
Diluted $ 0.40 $ 0.14 $ 0.98 $ 0.25
Cash dividends per common share $ 0.165 $ 0.160 $ 0.325 $ 0.320
Weighted average common shares outstanding:        
Basic 53,361 53,054 53,386 52,914
Diluted 53,537 53,358 53,657 53,359
[1] Tax (benefit) expense was $(428) and $56 for the three months ended June 30, 2014 and 2013, respectively. Tax (benefit) expense was $(536) and $652 for the six months ended June 30, 2014 and 2013, respectively.
[2] Tax expense (benefit) was $4 and $(36) for the three months ended June 30, 2014 and 2013, respectively. Tax expense (benefit) was $28 and $(37) for the six months ended June 30, 2014 and 2013, respectively.