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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Revenues:        
Total revenues $ 564,178 $ 526,929 $ 1,058,277 $ 1,014,396
Cost of revenues:        
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) 240,260 219,595 446,724 437,230
Gross profit 323,918 307,334 611,553 577,166
Operating expenses:        
Selling and administrative 108,811 99,410 210,824 189,916
Engineering and development 81,434 75,342 158,225 149,750
Acquired intangible assets amortization 10,083 9,793 20,717 17,491
Restructuring and other (10,404) 2,389 (5,292) 2,076
Total operating expenses 189,924 186,934 384,474 359,233
Income from operations 133,994 120,400 227,079 217,933
Non-operating (income) expense:        
Interest income (5,430) (5,427) (13,482) (11,407)
Interest expense 5,800 5,639 11,513 12,530
Other (income) expense, net 2,447 176 3,892 979
Income before income taxes 131,177 120,012 225,156 215,831
Income tax provision 33,780 18,975 18,621 27,821
Net income $ 97,397 $ 101,037 $ 206,535 $ 188,010
Net income per common share:        
Basic $ 0.57 $ 0.53 $ 1.20 $ 0.97
Diluted $ 0.55 $ 0.52 $ 1.16 $ 0.94
Weighted average common shares-basic 171,241 190,730 172,387 192,992
Weighted average common shares-diluted 178,590 194,909 177,781 199,197
Product [Member]        
Revenues:        
Total revenues $ 457,511 $ 434,051 $ 850,953 $ 837,976
Cost of revenues:        
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) 193,299 180,777 358,667 361,735
Service [Member]        
Revenues:        
Total revenues 106,667 92,878 207,324 176,420
Cost of revenues:        
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) $ 46,961 $ 38,818 $ 88,057 $ 75,495