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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 03, 2015
Sep. 27, 2014
Oct. 03, 2015
Sep. 27, 2014
Income Statement [Abstract]        
Product sales $ 336,933 $ 331,165 $ 971,842 $ 937,225
Service sales 163,645 162,000 483,880 468,249
Total net sales 500,578 493,165 1,455,722 1,405,474
Cost of product sales 138,014 133,868 398,168 387,646
Cost of service sales 68,790 68,354 206,589 204,148
Total cost of sales 206,804 202,222 604,757 591,794
Gross profit 293,774 290,943 850,965 813,680
Selling and administrative expenses 124,655 122,226 367,066 380,791
Research and development expenses 30,703 27,279 90,209 79,002
Purchased intangibles amortization 2,573 2,725 7,547 8,018
Operating income 135,843 138,713 386,143 345,869
Interest expense (9,017) (9,062) (27,038) (24,522)
Interest income 2,736 1,762 7,576 4,920
Income from operations before income taxes 129,562 131,413 366,681 326,267
Provision for income taxes 13,281 17,916 48,682 45,939
Net income $ 116,281 $ 113,497 $ 317,999 $ 280,328
Net income per basic common share $ 1.42 $ 1.36 $ 3.85 $ 3.32
Weighted-average number of basic common shares 82,036 83,663 82,552 84,375
Net income per diluted common share $ 1.40 $ 1.34 $ 3.82 $ 3.29
Weighted-average number of diluted common shares and equivalents 82,784 84,401 83,305 85,162