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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, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Oct. 01, 2016
Jul. 02, 2016
Apr. 02, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]                      
Net sales $ 687,275 $ 565,584 $ 558,250 $ 497,969 $ 628,787 $ 526,830 $ 536,560 $ 475,246 $ 2,309,078 $ 2,167,423 $ 2,042,332
Cost of sales 270,453 235,892 229,627 211,095 251,579 218,344 220,379 201,151 947,067 891,453  
Selling and administrative expenses 148,795 135,194 130,190 130,524 130,238 123,861 129,581 129,351 544,703 513,031 495,747
Research and development expenses 35,122 33,782 32,937 30,752 32,753 30,418 32,578 29,438 132,593 125,187 118,545
Litigation provisions 1,096   10,018   3,524       11,114 3,524 3,939
Purchased intangibles amortization 1,639 1,682 1,693 1,729 2,358 2,476 2,411 2,644 6,743 9,889 10,123
Acquired in-process research and development       5,000         5,000   3,855
Total costs and operating expenses 457,105 406,550 404,465 379,100 420,452 375,099 384,949 362,584 1,647,220 1,543,084 1,474,881
Operating income 230,170 159,034 153,785 118,869 208,335 151,731 151,611 112,662 661,858 624,339 567,451
Interest expense (15,281) (14,750) (14,083) (12,725) (12,102) (11,707) (10,983) (10,119) (56,839) (44,911) (36,243)
Interest income 10,849 9,516 8,370 7,343 6,346 5,426 4,827 4,087 36,078 20,686 10,711
Income before income taxes 225,738 153,800 148,072 113,487 202,579 145,450 145,455 106,630 641,097 600,114 541,919
Provision for income taxes 578,910 17,696 16,250 7,930 28,201 20,594 17,238 12,578 620,786 78,611 72,866
Net income (loss) $ (353,172) $ 136,104 $ 131,822 $ 105,557 $ 174,378 $ 124,856 $ 128,217 $ 94,052 $ 20,311 $ 521,503 $ 469,053
Net income (loss) per basic common share $ (4.44) $ 1.71 $ 1.65 $ 1.32 $ 2.17 $ 1.55 $ 1.59 $ 1.16 $ 0.25 $ 6.46 $ 5.7
Weighted-average number of basic common shares 79,454 79,712 79,979 80,073 80,366 80,677 80,804 81,275 79,793 80,786 82,336
Net income (loss) per diluted common share $ (4.44) $ 1.69 $ 1.63 $ 1.31 $ 2.15 $ 1.53 $ 1.57 $ 1.15 $ 0.25 $ 6.41 $ 5.65
Weighted-average number of diluted common shares and equivalents 79,454 80,521 80,756 80,769 80,954 81,388 81,455 81,974 80,604 81,417 83,087
Incremental stock-based compensation cost due to acceleration of awards   $ 4,000           $ 7,000 $ 4,000 $ 7,000  
Income tax provision related to 2017 Tax Act $ 550,000               $ 550,000