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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

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