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Condensed Consolidated Statements of Operations Condensed Consolidated Statement of Operations - USD ($)
shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Income Statement [Abstract]        
Product $ 278,112,000 $ 228,916,000 $ 848,690,000 $ 688,974,000
Royalty and other revenue 0 95,000 0 1,353,000
Total revenue 278,112,000 229,011,000 848,690,000 690,327,000
Cost of goods sold 99,186,000 72,743,000 292,551,000 228,078,000
Gross profit 178,926,000 156,268,000 556,139,000 462,249,000
Selling, general and administrative 90,376,000 80,354,000 278,714,000 232,718,000
Research and development 28,852,000 24,282,000 86,971,000 69,872,000
Litigation awards 0 0 (474,000) 0
Total operating expenses 119,228,000 104,636,000 365,211,000 302,590,000
Operating income 59,698,000 51,632,000 190,928,000 159,659,000
Non-operating income 1,357,000 2,723,000 6,108,000 10,138,000
Income before provision for income taxes 61,055,000 54,355,000 197,036,000 169,797,000
Provision for income taxes 11,650,000 5,270,000 27,403,000 26,502,000
Net income $ 49,405,000 $ 49,085,000 $ 169,633,000 $ 143,295,000
Basic $ 0.90 $ 0.92 $ 3.11 $ 2.69
Diluted $ 0.85 $ 0.86 $ 2.92 $ 2.51
Basic 54,997 53,535 54,543 53,367
Diluted 58,280 57,262 58,033 57,055