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Condensed Consolidated Statements of Operations Condensed Consolidated Statement of Operations - USD ($)
shares in Thousands
 3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Income Statement [Abstract]    
Product $ 269,625,000 $ 230,548,000
Royalty and other revenue 0 1,116,000
Total revenue 269,625,000 231,664,000
Cost of goods sold 83,996,000 80,022,000
Gross profit 185,629,000 151,642,000
Selling, general and administrative 89,877,000 74,204,000
Research and development 27,241,000 21,415,000
Litigation settlement awards (499,000) 0
Total operating expenses 116,619,000 95,619,000
Operating income 69,010,000 56,023,000
Non-operating income 3,346,000 3,886,000
Income before provision for income taxes 72,356,000 59,909,000
Provision for income taxes 7,900,000 10,587,000
Net income $ 64,456,000 $ 49,322,000
Basic $ 1.20 $ 0.93
Diluted $ 1.12 $ 0.87
Basic 53,867 53,210
Diluted 57,585 56,799