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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. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Revenue from continuing operations before reimbursement									$ 285,887	$ 276,599	$ 279,787
Operating income	$ 2,797	$ 8,254	$ 14,243	$ 8,280	$ 7,815	$ 7,279	$ 6,000	$ 7,610	33,574	28,704	33,517
Income (loss) from continuing operations	2,715	5,671	11,672	7,301	8,835	4,782	4,351	7,588
Income (loss) from discontinued operations	(2,851)	(514)	(151)	66	606	507	399	286
Net income	$ (136)	$ 5,157	$ 11,521	$ 7,367	$ 9,441	$ 5,289	$ 4,750	$ 7,874	$ 23,909	$ 27,354	$ 21,541
Basic net income per common share:
Income (loss) per common share from continuing operations	$ 0.09	$ 0.19	$ 0.40	$ 0.25	$ 0.31	$ 0.16	$ 0.15	$ 0.26	$ 0.93	$ 0.89	$ 0.71
Income (loss) per common share from discontinued operations	(0.09)	(0.02)	(0.01)		0.02	0.02	0.01	0.01	(0.12)	0.06	0.03
Net income (loss) per common share	0.00	0.17	0.39	0.25	0.33	0.18	0.16	0.27	0.81	0.95	0.74
Diluted net income per common share:
Income (loss) per common share from continuing operations	0.08	0.18	0.36	0.23	0.27	0.15	0.14	0.23	0.85	0.79	0.63
Income (loss) per common share from discontinued operations	(0.08)	(0.02)	0.00		0.02	0.02	0.01	0.01	(0.11)	0.06	0.03
Net income (loss) per common share	$ 0.00	$ 0.16	$ 0.36	$ 0.23	$ 0.29	$ 0.17	$ 0.15	$ 0.24	$ 0.74	$ 0.85	$ 0.66
Revenue Before Reimbursements [Member]
Revenue from continuing operations before reimbursement	$ 61,595	$ 68,183	$ 68,706	$ 66,039	$ 62,307	$ 63,742	$ 65,679	$ 63,403	$ 264,523	$ 255,131	$ 252,096

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