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Investment in Unconsolidated Subsidiary (Assets, Liabilities and members' equity) (Details) - USD ($) $ in Thousands	Jun. 29, 2019	Dec. 31, 2018
ASSETS
Property, plant and equipment, net	$ 621,733	$ 576,384
Diamond Green Diesel Holdings LLC Joint Venture [Member]
ASSETS
Total current assets	252,521	186,258
Other assets	23,877	24,601
Total assets	898,131	787,243
Liabilities and members' equity:
Total current portion of long term debt	284	189
Total other current liabilities	51,828	40,619
Total long term debt	8,936	8,485
Total other long term liabilities	4,511	539
Total liabilities and members' equity	832,572	737,411
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	$ 898,131	$ 787,243

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