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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net revenues:    
Products $ 153,621 $ 186,096
Services 30,060 27,743
Total net revenues 183,681 213,839
Cost of revenues:    
Cost of products 85,352 98,652
Cost of services 20,416 18,141
Total cost of revenues (exclusive of amortization shown separately below) 105,768 116,793
Gross profit 77,913 97,046
Research and development 17,227 16,680
Selling, general and administrative 33,950 30,867
Acquisition costs 2,494 30
Restructuring   788
Amortization of intangible assets 1,683 1,671
Income from operations 22,559 47,010
Interest and other income, net 1,246 504
Income before income taxes 23,805 47,514
Provision for income taxes 6,242 13,728
Net income 17,563 33,786
Other comprehensive income:    
Changes in value of financial instruments designated as cash flow hedges, net of tax benefit [1] (1,546) (822)
Foreign currency translation adjustments, net of tax of $0 2,652 (3,206)
Unrealized gain on investments, net of tax expense [2] 378 334
Total comprehensive income $ 19,047 $ 30,092
Net income per share:    
Basic $ 0.33 $ 0.63
Diluted 0.33 0.63
Cash dividends per common share $ 0.170 $ 0.165
Weighted average common shares outstanding:    
Basic 53,235 53,214
Diluted 53,563 53,529
[1] Tax benefit was $1,041 and $133 for the three months ended March 31, 2016 and 2015, respectively.
[2] Tax expense was $254 and $54 for the three months ended March 31, 2016 and 2015, respectively.