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Quarterly Financial Information (Unaudited Supplemental Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Dec. 30, 2016	Jan. 01, 2016	Jan. 02, 2015
Consolidated Statements of Operations [Abstract]
Total revenue	$ 62,946	$ 66,810	$ 68,178	$ 61,973	$ 60,261	$ 59,992	$ 59,423	$ 54,905	$ 288,561	$ 260,940	$ 236,737
Operating income	9,668	9,007	8,638	7,240	6,298	4,943	6,049	4,635	34,553	21,925	12,586
Income from continuing operations	9,569	8,870	8,528	7,199	6,237	4,842	5,940	4,497	34,166	21,516	11,966
Net income	$ 6,225	$ 5,488	$ 5,446	$ 4,382	$ 4,055	$ 3,058	$ 3,691	$ 3,005	$ 21,541	$ 13,809	$ 9,711
Basic net income per common share	$ 0.22	$ 0.19	$ 0.19	$ 0.15	$ 0.14	$ 0.11	$ 0.13	$ 0.11	$ 0.74	$ 0.47	$ 0.34
Diluted net income per common share	$ 0.19	$ 0.17	$ 0.17	$ 0.13	$ 0.12	$ 0.10	$ 0.12	$ 0.10	$ 0.66	$ 0.43	$ 0.33

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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