Selected Quarterly Financial Data (Unaudited) (Details) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
	Oct. 30, 2017	Dec. 31, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares	Jul. 01, 2018 USD ($) $ / shares	Apr. 01, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares shares	Oct. 01, 2017 USD ($) $ / shares	Jul. 02, 2017 USD ($) $ / shares	Apr. 02, 2017 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares
Quarterly Financial Information Disclosure [Abstract]
Revenue		$ 193,286	$ 232,221	$ 211,264	$ 169,567	$ 182,922	$ 266,042	$ 178,080	$ 139,039	$ 806,338	$ 766,083	$ 529,515
Gross margin		140,461	173,361	157,095	129,369	138,390	197,981	135,916	106,507	600,286	578,794	398,445
Operating income		45,247	77,844	63,455	34,596	50,775	110,849	60,021	37,216	221,142	258,861	154,066
Net income (loss)		$ 45,418	$ 80,436	$ 56,196	$ 37,217	$ (27,747)	$ 102,493	$ 56,495	$ 45,471	$ 219,267	$ 176,712	$ 143,694
Basic net income (loss) per share (in dollars per share) | $ / shares		$ 0.26	$ 0.47	$ 0.33	$ 0.21	$ (0.16)	$ 0.59	$ 0.33	$ 0.26	$ 1.27	$ 1.02	$ 0.84
Diluted net income (loss) per share (in dollars per share) | $ / shares		$ 0.26	$ 0.45	$ 0.32	$ 0.21	$ (0.16)	$ 0.57	$ 0.32	$ 0.25	$ 1.24	$ 0.98	$ 0.83
Stock split	2					2					2
Stock not included in calculation of diluted net loss per share (in shares) | shares						7,145				2,650,164	3,363,141	4,391,598