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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 02, 2016
Jul. 04, 2015
Jul. 02, 2016
Jul. 04, 2015
Income Statement [Abstract]        
Product sales $ 359,687 $ 332,036 $ 667,544 $ 634,909
Service sales 176,873 162,704 344,262 320,235
Total net sales 536,560 494,740 1,011,806 955,144
Cost of product sales 144,814 138,201 274,072 260,154
Cost of service sales 75,565 70,506 147,458 137,799
Total cost of sales 220,379 208,707 421,530 397,953
Gross profit 316,181 286,033 590,276 557,191
Selling and administrative expenses 129,581 122,660 258,932 242,411
Research and development expenses 32,578 30,555 62,016 59,506
Purchased intangibles amortization 2,411 2,500 5,055 4,974
Operating income 151,611 130,318 264,273 250,300
Interest expense (10,983) (9,046) (21,102) (18,021)
Interest income 4,827 2,500 8,914 4,840
Income from operations before income taxes 145,455 123,772 252,085 237,119
Provision for income taxes 17,238 18,115 29,816 35,401
Net income $ 128,217 $ 105,657 $ 222,269 $ 201,718
Net income per basic common share $ 1.59 $ 1.28 $ 2.74 $ 2.44
Weighted-average number of basic common shares 80,804 82,564 81,043 82,798
Net income per diluted common share $ 1.57 $ 1.27 $ 2.72 $ 2.41
Weighted-average number of diluted common shares and equivalents 81,455 83,332 81,663 83,551