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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