Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2014	Jul. 02, 2013	Jul. 01, 2014	Jul. 02, 2013
Stock-based compensation
Total stock-based compensation	$ 3,899	$ 3,408	$ 7,738	$ 6,813
Income tax benefit	1,491	1,304	2,960	2,606
Total stock-based compensation, net of taxes	2,408	2,104	4,778	4,207
Capitalized stock-based compensation	51	41	99	88
Labor Expenses [Member]
Stock-based compensation
Total stock-based compensation	1,196	1,049	2,536	2,093
Other Operating Costs and Expenses [Member]
Stock-based compensation
Total stock-based compensation	42	52	89	98
General and Administrative Expense [Member]
Stock-based compensation
Total stock-based compensation	$ 2,661	$ 2,307	$ 5,113	$ 4,622