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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net revenues:    
Products $ 496,677 $ 387,938
Services 57,598 49,215
Total net revenues 554,275 437,153
Cost of revenues:    
Cost of products 261,321 205,834
Cost of services 30,099 25,772
Total cost of revenues (exclusive of amortization shown separately below) 291,420 231,606
Gross profit 262,855 205,547
Research and development 34,857 33,282
Selling, general and administrative 82,949 74,220
Acquisition and integration costs   1,442
Restructuring 1,220 522
Environmental costs 1,000  
Amortization of intangible assets 11,190 12,501
Income from operations 131,639 83,580
Interest income 1,105 516
Interest expense 5,430 8,832
Other (expense) income (572) 2,021
Income before income taxes 126,742 77,285
Provision for income taxes 21,621 12,225
Net income 105,121 65,060
Other comprehensive income:    
Changes in value of financial instruments designated as cash flow hedges, net of tax benefit [1] 178 (2,440)
Foreign currency translation adjustments, net of tax of $0 10,771 4,534
Unrecognized pension (loss) gain, net of tax benefit (expense) [2] (85) 115
Unrealized (loss) on investments, net of tax benefit [3] (59) (126)
Total comprehensive income $ 115,926 $ 67,143
Net income per share:    
Basic $ 1.93 $ 1.21
Diluted 1.90 1.18
Cash dividends per common share $ 0.180 $ 0.175
Weighted average common shares outstanding:    
Basic 54,423 53,769
Diluted 55,286 54,958
[1] Tax benefit was $112 and $1,831 for the three months ended March 31, 2018 and 2017, respectively.
[2] Tax benefit (expense) was $36 and $(86) for the three months ended March 31, 2018 and 2017, respectively.
[3] Tax benefit was $17 and $94 for the three months ended March 31, 2018 and 2017, respectively.