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Geographic and Group Information (Geographic Revenue before Reimbursements) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 25, 2020
Sep. 27, 2019
Sep. 25, 2020
Sep. 27, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from continuing operations before reimbursements $ 57,917 $ 72,690 $ 180,201 $ 213,366
Revenue Before Reimbursements [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from continuing operations before reimbursements 57,769 66,755 175,587 197,101
Revenue Before Reimbursements [Member] | North America [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from continuing operations before reimbursements 51,343 56,014 155,912 165,301
Revenue Before Reimbursements [Member] | International (Primarily European Countries) [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from continuing operations before reimbursements $ 6,426 $ 10,741 $ 19,675 $ 31,800