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Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Product sales $ 284,795 $ 293,714
Service sales 145,713 136,624
Total net sales 430,508 430,338
Cost of product sales 122,475 113,752
Cost of service sales 65,244 60,816
Total cost of sales 187,719 174,568
Gross profit 242,789 255,770
Selling and administrative expenses 126,635 118,660
Research and development expenses 24,746 25,312
Purchased intangibles amortization 2,647 2,393
Operating income 88,761 109,405
Interest expense (7,489) (7,185)
Interest income 1,458 1,187
Income from operations before income taxes 82,730 103,407
Provision for income tax expense (benefit) 12,428 (17,652)
Net income $ 70,302 $ 121,059
Net income per basic common share $ 0.83 $ 1.41
Weighted-average number of basic common shares 84,977 86,049
Net income per diluted common share $ 0.82 $ 1.39
Weighted-average number of diluted common shares and equivalents 85,873 87,215