Repurchase of Common Stock (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016	Oct. 01, 2017
Subsequent Event [Line Items]
Amount repurchased under Board-approved share repurchase program	$ 40,000	$ 25,000	$ 115,000	$ 95,000
Amount repurchased in connection with the vesting of employee restricted stock grants	64	259	5,158	1,410
Total amount repurchased	$ 40,064	$ 25,259	$ 120,158	$ 96,410
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount					$ 500,000