Stock Based Compensation (Schedule of Share Based Compensation Included in Net Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share based compensation	$ 10,316	$ 8,765	$ 10,361
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share based compensation	7,801	7,550	6,776
Stock Options And Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share based compensation			2,658
Common Stock Subject to Vesting Requirements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share based compensation	$ 2,515	$ 1,215	$ 927