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Geographic and Group Information (Geographic Revenue before Reimbursements) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Sep. 25, 2020	Oct. 01, 2021	Sep. 25, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from continuing operations before reimbursements	$ 71,894	$ 57,917	$ 208,577	$ 180,201
Revenue from Continuing Operations Before Reimbursement [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from continuing operations before reimbursements	71,400	57,769	207,807	175,587
Revenue from Continuing Operations Before Reimbursement [Member] | North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from continuing operations before reimbursements	64,664	51,343	188,371	155,912
Revenue from Continuing Operations Before Reimbursement [Member] | International (Primarily European Countries) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from continuing operations before reimbursements	$ 6,736	$ 6,426	$ 19,436	$ 19,675

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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