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Investment in Unconsolidated Subsidiary (Assets, Liabilities and members' equity) (Details) - USD ($) $ in Thousands | Mar. 30, 2019 | Dec. 31, 2018
--- | --- | ---
ASSETS |  |
Property, plant and equipment, net | $ 591,927 | $ 576,384
Diamond Green Diesel Holdings LLC Joint Venture [Member] |  |
ASSETS |  |
Total current assets | 225,948 | 186,258
Other assets | 26,427 | 24,601
Total assets | 844,302 | 787,243
Liabilities and members' equity: |  |
Total current portion of long term debt | 276 | 189
Total other current liabilities | 44,440 | 40,619
Total long term debt | 9,010 | 8,485
Total other long term liabilities | 4,612 | 539
Total liabilities and members' equity | 785,964 | 737,411
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | $ 844,302 | $ 787,243

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