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Investment in Unconsolidated Subsidiary (Assets, Liabilities and members' equity) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
ASSETS |  |
Property, plant and equipment, net | $ 475,218 | $ 435,328
Total assets | 782,952 | 642,761
Liabilities and members' equity: |  |
Total current portion of long term debt | 0 | 17,023
Total long term debt | 0 | 36,730
Total liabilities and member's equity | 742,252 | 547,853
Diamond Green Diesel Holdings LLC Joint Venture [Member] |  |
ASSETS |  |
Total current assets | 295,775 | 202,778
Other assets | 11,959 | 4,655
Liabilities and members' equity: |  |
Total other current liabilities | 40,242 | 40,705
Total other long term liabilities | 458 | 450
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | $ 782,952 | $ 642,761

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