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Debt (Details) - USD ($)
$ in Thousands
Sep. 25, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Foreign debt $ 6,988 $ 0
Fixed rate industrial development revenue bonds 1,602 2,218
Total long-term debt outstanding 8,590 2,218
Current portion of long-term debt 2,216 868
Gross long-term debt 6,374 1,350
Unamortized deferred financing fees 0 90
Long-term debt $ 6,374 $ 1,260