Share-Based Compensation (Component of Net Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 25, 2013	Dec. 26, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation	$ 5,846	$ 4,852	$ 3,496
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation	52	558	909
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation	5,009	3,488	2,050
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation	$ 785	$ 806	$ 537