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Condensed Consolidated Statement of Operations Statement - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Product $ 202,068 $ 179,696 $ 608,461 $ 541,889
Royalty and other revenue 8,515 13,664 26,696 40,420
Total revenue 210,583 193,360 635,157 582,309
Cost of goods sold 69,830 69,295 208,596 198,929
Gross profit 140,753 124,065 426,561 383,380
Selling, general and administrative 72,670 65,704 215,263 198,460
Research and development 19,442 15,300 57,160 45,859
Total operating expenses 92,112 81,004 272,423 244,319
Operating income 48,641 43,061 154,138 139,061
Non-operating income 1,028 287 4,080 1,319
Income before provision (benefit) for income taxes 49,669 43,348 158,218 140,380
Provision (benefit) for income taxes (7,457) 7,495 11,609 7,856
Net income 57,126 35,853 146,609 132,524
Net income 57,126 35,853 146,609 132,524
Unrealized gains (losses) from foreign currency translation adjustments $ 179 $ 1,404 $ (2,877) $ 4,270
Basic $ 1.09 $ 0.69 $ 2.78 $ 2.57
Diluted $ 1.02 $ 0.64 $ 2.59 $ 2.37
Basic 52,432 52,079 52,726 51,469
Diluted 56,237 56,163 56,555 55,967
As Previously Reported        
Product   $ 181,271   $ 542,170
Royalty and other revenue   12,421   30,757
Cost of goods sold   65,027   191,692
Selling, general and administrative   65,390   197,339
Provision (benefit) for income taxes   9,027   8,108
Net income   $ 39,235   $ 131,248
Basic   $ 0.75   $ 2.55
Diluted   $ 0.70   $ 2.35