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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Revenues:        
Total net sales $ 596,219 $ 558,250 $ 1,126,889 $ 1,056,219
Costs and operating expenses:        
Selling and administrative expenses 136,645 130,093 267,052 260,766
Research and development expenses 35,644 32,937 70,124 63,689
Litigation settlement   10,018 (1,672) 10,018
Purchased intangibles amortization 1,602 1,693 3,261 3,422
Acquired in-process research and development       5,000
Total costs and operating expenses 417,026 404,368 803,321 783,617
Operating income 179,193 153,882 323,568 272,602
Other income (1,828) (97) (1,482) 52
Interest expense (11,692) (14,083) (25,530) (26,808)
Interest income 8,888 8,370 18,554 15,713
Income before income taxes 174,561 148,072 315,110 261,559
Provision for income taxes 18,884 16,250 47,482 24,180
Net income $ 155,677 $ 131,822 $ 267,628 $ 237,379
Net income per basic common share $ 2.00 $ 1.65 $ 3.42 $ 2.97
Weighted-average number of basic common shares 77,833 79,979 78,330 80,029
Net income per diluted common share $ 1.98 $ 1.63 $ 3.39 $ 2.94
Weighted-average number of diluted common shares and equivalents 78,438 80,756 79,041 80,769
Product [Member]        
Revenues:        
Total net sales $ 388,869 $ 372,838 $ 727,986 $ 697,134
Costs and operating expenses:        
Costs and operating expenses 159,979 148,023 300,445 281,179
Service [Member]        
Revenues:        
Total net sales 207,350 185,412 398,903 359,085
Costs and operating expenses:        
Costs and operating expenses $ 83,156 $ 81,604 $ 164,111 $ 159,543