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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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