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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Income Statement [Abstract]        
Product sales $ 372,838 $ 359,687 $ 697,134 $ 667,544
Service sales 185,412 176,873 359,085 344,262
Total net sales 558,250 536,560 1,056,219 1,011,806
Cost of product sales 148,023 144,814 281,179 274,072
Cost of service sales 81,604 75,565 159,543 147,458
Selling and administrative expenses 130,190 129,581 260,714 258,932
Research and development expenses 32,937 32,578 63,689 62,016
Litigation provisions 10,018   10,018  
Acquired in-process research and development     5,000  
Purchased intangibles amortization 1,693 2,411 3,422 5,055
Total costs and operating expenses 404,465 384,949 783,565 747,533
Operating income 153,785 151,611 272,654 264,273
Interest expense (14,083) (10,983) (26,808) (21,102)
Interest income 8,370 4,827 15,713 8,914
Income from operations before income taxes 148,072 145,455 261,559 252,085
Provision for income taxes 16,250 17,238 24,180 29,816
Net income $ 131,822 $ 128,217 $ 237,379 $ 222,269
Net income per basic common share $ 1.65 $ 1.59 $ 2.97 $ 2.74
Weighted-average number of basic common shares 79,979 80,804 80,029 81,043
Net income per diluted common share $ 1.63 $ 1.57 $ 2.94 $ 2.72
Weighted-average number of diluted common shares and equivalents 80,756 81,455 80,769 81,663