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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 04, 2015
Jun. 28, 2014
Jul. 04, 2015
Jun. 28, 2014
Income Statement [Abstract]        
Product sales $ 332,036 $ 321,265 $ 634,909 $ 606,060
Service sales 162,704 160,536 320,235 306,249
Total net sales 494,740 481,801 955,144 912,309
Cost of product sales 138,201 131,303 260,154 253,778
Cost of service sales 70,506 70,550 137,799 135,794
Total cost of sales 208,707 201,853 397,953 389,572
Gross profit 286,033 279,948 557,191 522,737
Selling and administrative expenses 122,660 131,930 242,411 258,565
Research and development expenses 30,555 26,977 59,506 51,723
Purchased intangibles amortization 2,500 2,646 4,974 5,293
Operating income 130,318 118,395 250,300 207,156
Interest expense (9,046) (7,971) (18,021) (15,460)
Interest income 2,500 1,700 4,840 3,158
Income from operations before income taxes 123,772 112,124 237,119 194,854
Provision for income taxes 18,115 15,595 35,401 28,023
Net income $ 105,657 $ 96,529 $ 201,718 $ 166,831
Net income per basic common share $ 1.28 $ 1.14 $ 2.44 $ 1.97
Weighted-average number of basic common shares 82,564 84,462 82,798 84,731
Net income per diluted common share $ 1.27 $ 1.13 $ 2.41 $ 1.95
Weighted-average number of diluted common shares and equivalents 83,332 85,177 83,551 85,538