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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, 2013
Mar. 31, 2012
Net revenues:    
Products $ 116,611 $ 164,488
Services 25,034 26,380
Total net revenues 141,645 190,868
Cost of revenues:    
Cost of products 70,575 91,024
Cost of services 16,368 16,053
Total cost of revenues 86,943 107,077
Gross profit 54,702 83,791
Research and development 15,248 16,184
Selling, general and administrative 34,173 34,119
Completed acquisition costs 171  
Amortization of intangible assets 434 119
Income from operations 4,676 33,369
Interest income 305 261
Interest expense 14 9
Income before income taxes 4,967 33,621
(Benefit) provision for income taxes (794) 10,853
Net income 5,761 22,768
Other comprehensive (loss) income:    
Changes in value of financial instruments designated as cash flow hedges, net of tax expense 1,011 [1] 641 [1]
Foreign currency translation adjustments, net of tax of $0 for the three months ended March 31, 2013 and 2012, respectively (8,340) 301
Unrealized (loss) on investments, net of tax (benefit) (16) [2] (41) [2]
Total comprehensive (loss) income $ (1,584) $ 23,669
Net income per share:    
Basic $ 0.11 $ 0.43
Diluted $ 0.11 $ 0.43
Cash dividends per common share $ 0.16 $ 0.15
Weighted average common shares outstanding:    
Basic 52,773 52,504
Diluted 53,359 53,222
[1] Tax expense was $605 and $413 for the three months ended March 31, 2013 and 2012, respectively.
[2] Tax benefit was $(10) and $(27) for the three months ended March 31, 2013 and 2012, respectively.