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Consolidated Statements of Operations and Comprehensive Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net revenues:    
Products $ 181,186 $ 116,611
Services 25,167 25,034
Total net revenues 206,353 141,645
Cost of revenues:    
Cost of products 100,211 70,575
Cost of services 16,770 16,368
Total cost of revenues 116,981 86,943
Gross profit 89,372 54,702
Research and development 15,618 15,248
Selling, general and administrative 34,591 34,133
Acquisition costs 228 171
Restructuring 747 40
Amortization of intangible assets 410 434
Income from operations 37,778 4,676
Interest income 252 305
Interest expense 17 14
Income before income taxes 38,013 4,967
Provision (benefit) for income taxes 6,768 (794)
Net income 31,245 5,761
Other comprehensive income (loss):    
Changes in value of financial instruments designated as cash flow hedges, net of tax (benefit) expense (163) [1] 1,011 [1]
Foreign currency translation adjustments, net of tax of $0 for the three months ended March 31, 2014 and 2013 21 (8,340)
Unrealized gain (loss) on investments, net of tax expense (benefit) 36 [2] (16) [2]
Total comprehensive income (loss) $ 31,139 $ (1,584)
Net income per share:    
Basic $ 0.58 $ 0.11
Diluted $ 0.58 $ 0.11
Cash dividends per common share $ 0.16 $ 0.16
Weighted average common shares outstanding:    
Basic 53,411 52,773
Diluted 53,776 53,359
[1] Tax (benefit) expense was $(108) and $605 for the three months ended March 31, 2014 and 2013, respectively.
[2] Tax expense (benefit) was $24 and $(10) for the three months ended March 31, 2014 and 2013, respectively.