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Consolidated Statements of Operations and Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net revenues:      
Products $ 697,104 $ 673,819 $ 568,317
Services 116,420 107,050 101,103
Total net revenues 813,524 780,869 669,420
Cost of revenues:      
Cost of products 373,764 374,200 337,464
Cost of services 76,888 68,903 65,382
Total cost of revenues (exclusive of amortization shown separately below) 450,652 443,103 402,846
Gross profit 362,872 337,766 266,574
Research and development 68,305 62,888 63,570
Selling, general and administrative 129,087 131,828 142,014
Insurance reimbursement     (1,071)
Acquisition costs 30 499 171
Restructuring 2,074 2,464 1,364
Amortization of intangible assets 6,764 4,945 2,139
Income from operations 156,612 135,142 58,387
Interest income 2,999 1,323 999
Interest expense 143 72 85
Income before income taxes 159,468 136,393 59,301
Provision for income taxes 37,171 20,615 23,525
Net income 122,297 115,778 35,776
Other comprehensive income:      
Changes in value of financial instruments designated as cash flow hedges, net of tax (benefit) expense [1] (469) 1,210 62
Foreign currency translation adjustments, net of tax of $0 for 2015, 2014 and 2013 (8,301) (14,707) (3,604)
Unrealized loss on investments, net of tax benefit [2] (317) (460) (40)
Total comprehensive income $ 113,210 $ 101,821 $ 32,194
Net income per share:      
Basic $ 2.30 $ 2.17 $ 0.67
Diluted 2.28 2.16 0.67
Cash dividends paid per common share $ 0.675 $ 0.655 $ 0.640
Weighted average common shares outstanding:      
Basic 53,282 53,232 53,061
Diluted 53,560 53,515 53,481
[1] Tax (benefit) expense was $(85), $144 and $551 for the years ended December 31, 2015, 2014 and 2013, respectively.
[2] Tax benefit was $(58), $(55), and $(355) for the years ended December 31, 2015, 2014 and 2013, respectively.