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Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 24,752	$ 21,810	$ 22,723	$ 22,074	$ 20,577	$ 19,134	$ 19,232	$ 19,026	$ 91,359	$ 77,969	$ 67,449
Operating income	8,255	6,080	7,240	7,628	6,508	5,853	2,406	4,951	29,203	19,718	18,066
Net income	$ 4,312	$ 2,753	$ 4,079	$ 4,290	$ 3,795	$ 3,173	$ 584	$ 2,554	$ 15,434	$ 10,106	$ 8,986
Earnings per share
Basic (in usd per share)	$ 0.15	$ 0.10	$ 0.14	$ 0.15	$ 0.13	$ 0.11	$ 0.02	$ 0.10	$ 0.54	$ 0.37	$ 0.35
Diluted (in usd per share)	$ 0.15	$ 0.09	$ 0.14	$ 0.15	$ 0.13	$ 0.11	$ 0.02	$ 0.10	$ 0.53	$ 0.36	$ 0.34
Weighted average shares outstanding
Basic (in shares)	28,745	28,725	28,646	28,586	28,581	28,581	26,689	26,290	28,637	27,497	25,846
Diluted weighted average number of common shares (in shares)	29,114	29,014	28,989	28,967	28,951	28,891	26,970	26,607	28,983	27,816	26,204

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