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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. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Cost of service: |  |  |
Gain (loss) from discontinued operations | $ (3,450) | $ 1,798 | $ 866
European REL Working Capital group [Member] |  |  |
Revenue: |  |  |
Total revenue | 3,015 | 9,263 | 8,774
Cost of service: |  |  |
Total cost of service | 5,836 | 5,591 | 5,736
Selling, general and administrative costs | 1,210 | 1,554 | 2,002
Total costs and operating expenses | 7,046 | 7,145 | 7,738
Income from discontinued operations before income taxes | (4,031) | 2,118 | 1,036
Income tax expense (benefit) | (581) | 320 | 170
Gain (loss) from discontinued operations | (3,450) | 1,798 | 866
European REL Working Capital group [Member] | Revenue Before Reimbursements [Member] |  |  |
Revenue: |  |  |
Total revenue | 2,519 | 8,121 | 7,811
European REL Working Capital group [Member] | Reimbursements [Member] |  |  |
Revenue: |  |  |
Total revenue | 496 | 1,142 | 963
Cost of service: |  |  |
Total cost of service | 496 | 1,142 | 963
European REL Working Capital group [Member] | Cost Before Reimbursements [Member] |  |  |
Cost of service: |  |  |
Total cost of service | $ 5,340 | $ 4,449 | $ 4,773

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