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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Revenues:    
Total revenues $ 494,099 $ 487,467
Cost of revenues:    
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) 206,464 217,635
Gross profit 287,635 269,832
Operating expenses:    
Selling and administrative 102,013 90,505
Engineering and development 76,791 74,408
Acquired intangible assets amortization 10,634 7,698
Restructuring and other 5,112 (313)
Total operating expenses 194,550 172,298
Income from operations 93,085 97,534
Non-operating (income) expense:    
Interest income (8,052) (5,981)
Interest expense 5,713 6,890
Other (income) expense, net 1,445 805
Income before income taxes 93,979 95,820
Income tax (benefit) provision (15,159) 8,846
Net income $ 109,138 $ 86,974
Net income per common share:    
Basic $ 0.63 $ 0.45
Diluted $ 0.62 $ 0.43
Weighted average common shares-basic 173,532 195,255
Weighted average common shares-diluted 176,972 203,484
Product [Member]    
Revenues:    
Total revenues $ 393,442 $ 403,925
Cost of revenues:    
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) 165,368 180,958
Service [Member]    
Revenues:    
Total revenues 100,657 83,542
Cost of revenues:    
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) $ 41,096 $ 36,677