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Basis of Presentation and General Information (Gain and Loss Results for Discontinued Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2019 | Sep. 28, 2018 | Sep. 27, 2019 | Sep. 28, 2018
Cost of service: |  |  |  |
Income (loss) from discontinued operations | $ 2 | $ (514) | $ (4) | $ (599)
European REL Working Capital group [Member] |  |  |  |
Revenue: |  |  |  |
Total revenue |  | 122 | 92 | 2,870
Cost of service: |  |  |  |
Total cost of service | 2 | 565 | 43 | 2,876
Selling, general and administrative costs | (4) | 183 | 52 | 785
Total costs and operating expenses | (2) | 748 | 95 | 3,661
Income (loss) from discontinued operations before income taxes | 2 | (626) | (3) | (791)
Income tax expense (benefit) |  | (112) | 1 | (192)
Income (loss) from discontinued operations | 2 | (514) | (4) | (599)
European REL Working Capital group [Member] | Revenue Before Reimbursements [Member] |  |  |  |
Revenue: |  |  |  |
Total revenue |  | 60 | 75 | 2,404
European REL Working Capital group [Member] | Reimbursements [Member] |  |  |  |
Revenue: |  |  |  |
Total revenue |  | 62 | 17 | 466
Cost of service: |  |  |  |
Total cost of service |  | 62 | 17 | 466
European REL Working Capital group [Member] | Cost Before Reimbursements [Member] |  |  |  |
Cost of service: |  |  |  |
Total cost of service | $ 2 | $ 503 | $ 26 | $ 2,410

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