Quarterly Financial Information (Consolidated Financial Information) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 09, 2014	Jun. 17, 2014	Mar. 25, 2014	Sep. 03, 2013	Jun. 11, 2013	Mar. 19, 2013	Dec. 30, 2014	Dec. 31, 2013	Dec. 30, 2014	Dec. 31, 2013	Dec. 25, 2012
Quarterly Financial Information [Abstract]
Revenues	$ 61,949	$ 67,386	$ 66,622	$ 54,183	$ 60,359	$ 59,802	$ 105,848	$ 97,462	$ 301,805	$ 271,806	$ 232,435
Operating income	2,452	6,920	6,749	(759)	6,935	4,904	8,419	6,811	24,540	17,891	24,621
Income from continuing operations	1,785	4,769	4,522	(380)	4,431	3,569	5,521	4,592	16,597	12,212	14,573
Net income	$ 1,785	$ 4,769	$ 4,522	$ (380)	$ 4,431	$ 3,569	$ 5,521	$ 4,592	$ 16,597	$ 12,212	$ 13,754
Basic income (loss) per common share:
Continuing operations	$ 0.08	$ 0.20	$ 0.19	$ (0.02)	$ 0.19	$ 0.15	$ 0.24	$ 0.19	$ 0.71	$ 0.51	$ 0.71
Discontinued operations											$ (0.04)
Basic income per share	$ 0.08	$ 0.20	$ 0.19	$ (0.02)	$ 0.19	$ 0.15	$ 0.24	$ 0.19	$ 0.71	$ 0.51	$ 0.67
Basic weighted average shares outstanding	23,464,000	23,579,000	23,627,000	23,801,000	23,795,000	23,795,000	23,430,000	23,744,000	23,517,883	23,779,782	20,432,579
Diluted income (loss) per common share:
Continuing operations	$ 0.08	$ 0.20	$ 0.19	$ (0.02)	$ 0.19	$ 0.15	$ 0.23	$ 0.19	$ 0.70	$ 0.51	$ 0.71
Discontinued operations											$ (0.04)
Diluted income per share	$ 0.08	$ 0.20	$ 0.19	$ (0.02)	$ 0.19	$ 0.15	$ 0.23	$ 0.19	$ 0.70	$ 0.51	$ 0.67
Diluted weighted average shares outstanding	23,683,000	23,847,000	23,856,000	23,937,000	23,827,000	23,795,000	23,611,000	23,859,000	23,740,318	23,852,200	20,432,579