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Investment in Unconsolidated Subsidiary (Assets, Liabilities and members' equity) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Property, plant and equipment, net	$ 529,312	$ 435,328
Diamond Green Diesel Holdings LLC Joint Venture [Member]
ASSETS
Total current assets	218,189	202,778
Other assets	18,861	4,655
Total assets	766,362	642,761
Liabilities and members' equity:
Total current portion of long term debt	176	17,023
Total other current liabilities	34,714	40,705
Total long term debt	8,583	36,730
Total other long term liabilities	465	450
Total liabilities and members' equity	722,424	547,853
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	$ 766,362	$ 642,761

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