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Geographic and Group Information (Revenue By Service Group) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2019 | Sep. 28, 2018 | Sep. 27, 2019 | Sep. 28, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenue before reimbursements from continuing operations | $ 72,690 | $ 73,718 | $ 213,366 | $ 219,352
Revenue Before Reimbursements [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue before reimbursements from continuing operations | 66,755 | 68,183 | 197,101 | 202,928
S&BT [Member] | Revenue Before Reimbursements [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue before reimbursements from continuing operations | 27,435 | 26,014 | 78,632 | 76,931
EEA [Member] | Revenue Before Reimbursements [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue before reimbursements from continuing operations | 30,920 | 29,971 | 89,049 | 89,145
International [Member] | Revenue Before Reimbursements [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue before reimbursements from continuing operations | $ 8,400 | $ 12,198 | $ 29,420 | $ 36,852

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