Quarterly Data - Unaudited, in Thousands, except Per Share Data (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Sep. 23, 2012	Jun. 24, 2012	Mar. 25, 2012	Dec. 29, 2013	Dec. 30, 2012	Dec. 25, 2011
Quarterly Financial Information
Total revenues	$ 387,890,000	$ 346,342,000	$ 349,186,000	$ 355,604,000	$ 367,284,000	$ 325,514,000	$ 318,579,000	$ 331,276,000	$ 1,439,022,000	$ 1,342,653,000	$ 1,217,882,000
Operating income	28,482,000	21,448,000	26,948,000	29,625,000	27,019,000	21,205,000	24,327,000	27,256,000	106,503,000	99,807,000	87,017,000
Net income attributable to the Company	18,805,000	14,276,000	17,150,000	19,306,000	17,359,000	13,031,000	14,289,000	16,981,000	69,537,000	61,660,000	54,735,000
Basic earnings per common share	$ 0.42	$ 0.33	$ 0.39	$ 0.43	$ 0.38	$ 0.28	$ 0.30	$ 0.35	$ 1.58	$ 1.31	$ 1.09
Earnings per common share - assuming dilution	$ 0.41	$ 0.32	$ 0.39	$ 0.42	$ 0.37	$ 0.27	$ 0.30	$ 0.35	$ 1.55	$ 1.29	$ 1.08
Dividends declared per common share	$ 0.125	$ 0.125							$ 0.25
Additional week
Quarterly Financial Information
Increase in revenues, amount					21,500,000
Increase (decrease) in operating income, amount					4,100,000
Increase (decrease) in operating income, per diluted share					$ 0.05
Incentive Contribution
Quarterly Financial Information
Increase (decrease) in operating income, amount	$ 250,000	$ 250,000	$ 250,000	$ 250,000	$ 250,000	$ 250,000	$ 250,000	$ (3,700,000)
Increase (decrease) in operating income, per diluted share								$ (0.05)