Stock Repurchase Program (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016	Jan. 31, 2017
Class of Stock Disclosures [Abstract]
Authorized amount					$ 525,000
Remaining authorized repurchase amount	$ 475,000		$ 475,000
Shares repurchased	1,331	9,596	1,331	31,177
Total cost of repurchased shares	$ 50,013	$ 240,096	$ 50,013	$ 720,196