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Basis of Presentation and General Information (Gain and Loss Results for Discontinued Operations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Dec. 29, 2017
Cost of service:      
Gain (loss) from discontinued operations $ (6) $ (3,450) $ 1,798
European REL Working Capital group [Member]      
Revenue:      
Total revenue 92 3,015 9,263
Cost of service:      
Total cost of service 45 5,836 5,591
Selling, general and administrative costs 52 1,210 1,554
Total costs and operating expenses 97 7,046 7,145
Income from discontinued operations before income taxes (5) (4,031) 2,118
Income tax expense (benefit) 1 (581) 320
Gain (loss) from discontinued operations (6) (3,450) 1,798
European REL Working Capital group [Member] | Revenue Before Reimbursements [Member]      
Revenue:      
Total revenue 75 2,519 8,121
European REL Working Capital group [Member] | Reimbursements [Member]      
Revenue:      
Total revenue 17 496 1,142
Cost of service:      
Total cost of service 17 496 1,142
European REL Working Capital group [Member] | Cost Before Reimbursements [Member]      
Cost of service:      
Total cost of service $ 28 $ 5,340 $ 4,449