Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Net income	$ 72,885	$ 68,259
Weighted-average common shares used to calculate basic net income per share (in shares)	273,773	270,173
Stock-based awards	7,878	7,563
Weighted average common shares used to calculate diluted net income per share (in shares)	281,651	277,736
Net income per share - basic (in usd per share)	$ 0.27	$ 0.25
Net income per share - diluted (in usd per share)	$ 0.26	$ 0.25