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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. 27, 2019 | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 27, 2019 | Dec. 28, 2018 | Dec. 29, 2017
Revenue from continuing operations before reimbursement |  |  |  |  |  |  |  |  | $ 282,472 | $ 285,887 | $ 276,599
Operating income | $ 3,593 | $ 9,396 | $ 9,759 | $ 8,590 | $ 2,797 | $ 8,254 | $ 14,243 | $ 8,280 | 31,338 | 33,574 | 28,704
Income (loss) from continuing operations | 2,287 | 6,907 | 7,040 | 7,049 | 2,715 | 5,671 | 11,672 | 7,301 |  |  |
Income (loss) from discontinued operations | (2) | 2 | (51) | 45 | (2,851) | (514) | (151) | 66 |  |  |
Net income | $ 2,285 | $ 6,909 | $ 6,989 | $ 7,094 | $ (136) | $ 5,157 | $ 11,521 | $ 7,367 | $ 23,277 | $ 23,909 | $ 27,354
Basic net income per common share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) per common share from continuing operations | $ 0.08 | $ 0.23 | $ 0.23 | $ 0.24 | $ 0.09 | $ 0.19 | $ 0.40 | $ 0.25 | $ 0.78 | $ 0.93 | $ 0.89
Income (loss) per common share from discontinued operations |  |  |  |  | (0.09) | (0.02) | (0.01) |  | 0.00 | (0.12) | 0.06
Net income per common share | 0.08 | 0.23 | 0.23 | 0.24 | 0.00 | 0.17 | 0.39 | 0.25 | 0.78 | 0.81 | 0.95
Diluted net income per common share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) per common share from continuing operations | 0.07 | 0.21 | 0.22 | 0.22 | 0.08 | 0.18 | 0.36 | 0.23 | 0.72 | 0.85 | 0.79
Income (loss) per common share from discontinued operations |  |  |  |  | (0.08) | (0.02) | 0.00 |  | 0.00 | (0.11) | 0.06
Net income per common share | $ 0.07 | $ 0.21 | $ 0.22 | $ 0.22 | $ 0.00 | $ 0.16 | $ 0.36 | $ 0.23 | $ 0.72 | $ 0.74 | $ 0.85
Revenue Before Reimbursements [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from continuing operations before reimbursement | $ 63,736 | $ 66,755 | $ 67,976 | $ 62,370 | $ 61,595 | $ 68,183 | $ 68,706 | $ 66,039 | $ 260,837 | $ 264,523 | $ 255,131

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