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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. 31, 2021
Oct. 01, 2021
Jul. 02, 2021
Apr. 02, 2021
Jan. 01, 2021
Sep. 25, 2020
Jun. 26, 2020
Mar. 27, 2020
Dec. 31, 2021
Jan. 01, 2021
Dec. 27, 2019
Revenue from continuing operations before reimbursement                 $ 278,809 $ 239,482 $ 282,472
Operating income (loss) $ 12,001 $ 11,405 $ 14,217 $ 8,853 $ 1,485 $ 4,527 $ (5,078) $ 7,708 46,476 8,642 31,338
Income from continuing operations before income taxes 11,982 11,379 14,192 8,828         46,381 8,516 31,027
Income (loss) from continuing operations         900 3,143 (3,933) 5,535 41,552 5,645 23,283
Income (loss) from discontinued operations       (7) (7) (157)   (8)      
Net income $ 16,521 $ 8,131 $ 10,532 $ 6,361 $ 893 $ 2,986 $ (3,933) $ 5,527 $ 41,545 $ 5,473 $ 23,277
Basic net income per common share:                      
Income (loss) per common share from continuing operations $ 0.55 $ 0.27 $ 0.35 $ 0.21 $ 0.03 $ 0.11 $ (0.13) $ 0.19 $ 1.38 $ 0.19 $ 0.78
Loss per common share from discontinued operations           (0.01)     0.00 (0.01) 0.00
Basic net income per common share 0.55 0.27 0.35 0.21 0.03 0.10 (0.13) 0.19 1.38 0.18 0.78
Diluted net income per common share:                      
Income (loss) per common share from continuing operations 0.50 0.25 0.32 0.19 0.03 0.10 (0.13) 0.17 1.26 0.17 0.72
Loss per common share from discontinued operations           (0.01)     0.00 0.00 0.00
Diluted net income per common share $ 0.50 $ 0.25 $ 0.32 $ 0.19 $ 0.03 $ 0.09 $ (0.13) $ 0.17 $ 1.26 $ 0.17 $ 0.72
Revenue Before Reimbursements [Member]                      
Revenue from continuing operations before reimbursement $ 69,776 $ 71,400 $ 72,997 $ 63,410 $ 59,223 $ 57,769 $ 52,632 $ 65,186 $ 277,583 $ 234,810 $ 260,837