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Unaudited Quarterly Results (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Oct. 03, 2015
Jul. 04, 2015
Apr. 04, 2015
Dec. 31, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Unaudited Quarterly Results [Line items]                      
Net sales $ 586,610 $ 500,578 $ 494,740 $ 460,404 $ 583,870 $ 493,165 $ 481,801 $ 430,508 $ 2,042,332 $ 1,989,344 $ 1,904,218
Cost of sales 237,915 206,804 208,707 189,246 233,119 202,222 201,853 187,719 842,672 824,913 783,456
Gross profit 348,695 293,774 286,033 271,158 350,751 290,943 279,948 242,789 1,199,660 1,164,431 1,120,762
Selling and administrative expenses 128,681 124,655 122,660 119,751 131,916 122,226 131,930 126,635 495,747 512,707 492,965
Research and development expenses 28,336 30,703 30,555 28,951 28,724 27,279 26,977 24,746 118,545 107,726 100,536
Acquired in-process research and development (Note 2) 3,855       15,456       3,855 15,456  
Purchased intangibles amortization 2,576 2,573 2,500 2,474 2,616 2,725 2,646 2,647 10,123 10,634 9,918
Litigation provisions (Note 10) 3,939               3,939    
Operating income 181,308 135,843 130,318 119,982 172,039 138,713 118,395 88,761 567,451 517,908 517,343
Other expense (Note 3)                     (1,575)
Interest expense (9,205) (9,017) (9,046) (8,975) (9,669) (9,062) (7,971) (7,489) (36,243) (34,191) (30,050)
Interest income 3,135 2,736 2,500 2,340 2,103 1,762 1,700 1,458 10,711 7,023 4,387
Income from operations before income taxes 175,238 129,562 123,772 113,347 164,473 131,413 112,124 82,730 541,919 490,740 490,105
Provision for income tax (benefit) expense 24,184 13,281 18,115 17,286 13,181 17,916 15,595 12,428 72,866 59,120 40,102
Net income $ 151,054 $ 116,281 $ 105,657 $ 96,061 $ 151,292 $ 113,497 $ 96,529 $ 70,302 $ 469,053 $ 431,620 $ 450,003
Net income per basic common share $ 1.85 $ 1.42 $ 1.28 $ 1.16 $ 1.82 $ 1.36 $ 1.14 $ 0.83 $ 5.70 $ 5.12 $ 5.27
Weighted-average number of basic common shares 81,650 82,036 82,564 83,025 83,217 83,663 84,462 84,977 82,336 84,358 85,426
Net income per diluted common share $ 1.83 $ 1.40 $ 1.27 $ 1.15 $ 1.80 $ 1.34 $ 1.13 $ 0.82 $ 5.65 $ 5.07 $ 5.20
Weighted-average number of diluted common shares and equivalents 82,382 82,784 83,332 83,752 84,015 84,401 85,177 85,873 83,087 85,151 86,546