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Investment in Unconsolidated Subsidiary (Assets, Liabilities and members' equity) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
ASSETS |  |
Property, plant and equipment, net | $ 567,092 | $ 435,328
Diamond Green Diesel Holdings LLC Joint Venture [Member] |  |
ASSETS |  |
Total current assets | 178,875 | 202,778
Other assets | 26,949 | 4,655
Total assets | 772,916 | 642,761
Liabilities and members' equity: |  |
Total current portion of long term debt | 182 | 17,023
Total other current liabilities | 46,502 | 40,705
Total long term debt | 8,535 | 36,730
Total other long term liabilities | 533 | 450
Total liabilities and members' equity | 717,164 | 547,853
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | $ 772,916 | $ 642,761

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