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Investment in Unconsolidated Subsidiary (Assets, Liabilities and members' equity) (Details) - USD ($) $ in Thousands | Mar. 28, 2020 | Dec. 31, 2019
--- | --- | ---
ASSETS |  |
Property, plant and equipment, net | $ 779,961 | $ 713,489
Diamond Green Diesel Holdings LLC Joint Venture [Member] |  |
ASSETS |  |
Total current assets | 821,602 | 668,026
Other assets | 30,446 | 30,710
Total assets | 1,632,009 | 1,412,225
Liabilities and members' equity: |  |
Total current portion of long term debt | 496 | 341
Total other current liabilities | 70,758 | 75,802
Total long term debt | 8,936 | 8,742
Total other long term liabilities | 4,273 | 4,422
Total liabilities and members' equity | 1,547,546 | 1,322,918
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | $ 1,632,009 | $ 1,412,225

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