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Condensed Consolidated Statements of Operations Condensed Consolidated Statement of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Income Statement [Abstract]
Product	$ 228,916	$ 202,068	$ 688,974	$ 608,461
Royalty and other revenue	95	8,515	1,353	26,696
Total revenue	229,011	210,583	690,327	635,157
Cost of goods sold	72,743	69,830	228,078	208,596
Gross profit	156,268	140,753	462,249	426,561
Selling, general and administrative	80,354	71,537	232,718	212,204
Research and development	24,282	20,575	69,872	60,219
Total operating expenses	104,636	92,112	302,590	272,423
Operating income	51,632	48,641	159,659	154,138
Non-operating income	2,723	1,028	10,138	4,080
Income before provision (benefit) for income taxes	54,355	49,669	169,797	158,218
Provision (benefit) for income taxes	5,270	(7,457)	26,502	11,609
Net income	$ 49,085	$ 57,126	$ 143,295	$ 146,609
Basic	$ 0.92	$ 1.09	$ 2.69	$ 2.82
Diluted	$ 0.86	$ 1.02	$ 2.51	$ 2.62
Basic	53,535	52,432	53,367	52,046
Diluted	57,262	56,237	57,055	55,875

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