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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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