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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. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Income Statement [Abstract]
Total revenue	$ 64,510	$ 65,947	$ 67,726	$ 65,069	$ 62,946	$ 66,810	$ 68,178	$ 61,973	$ 285,862	$ 288,561	$ 260,940
Operating income	8,520	7,874	6,464	7,964	9,668	9,007	8,638	7,240	30,822	34,553	21,925
Income from continuing operations	8,337	7,690	6,337	7,874	9,569	8,870	8,528	7,199
Net income	$ 9,441	$ 5,289	$ 4,750	$ 7,874	$ 6,225	$ 5,488	$ 5,446	$ 4,382	$ 27,354	$ 21,541	$ 13,809
Basic net income per common share	$ 0.33	$ 0.18	$ 0.16	$ 0.27	$ 0.22	$ 0.19	$ 0.19	$ 0.15	$ 0.95	$ 0.74	$ 0.47
Diluted net income per common share	$ 0.29	$ 0.17	$ 0.15	$ 0.24	$ 0.19	$ 0.17	$ 0.17	$ 0.13	$ 0.85	$ 0.66	$ 0.43

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- Definition

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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