Repurchase of Common Stock (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Repurchase of Common Stock [Abstract]
Amount repurchased under Board-approved share repurchase program	$ 55,000	$ 40,000	$ 195,000	$ 115,000
Amount repurchased in connection with the vesting of employee restricted stock grants	299	64	3,239	5,158
Total amount repurchased	55,299	$ 40,064	198,239	$ 120,158
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 270,000		$ 270,000