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Investment in Unconsolidated Subsidiary (Revenues and Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Expenses:
Operating income	$ 75,873	$ 30,076	$ 124,110	$ 224,098
Interest and debt expense, net	(321)	(319)	(645)	(319)
Diamond Green Diesel Holdings LLC Joint Venture [Member]
Revenues:
Operating revenues	294,811	151,989	597,529	302,310
Expenses:
Total costs and expenses less depreciation, amortization and accretion expense	207,024	115,659	450,087	65,838
Depreciation, amortization and accretion expense	11,914	6,254	23,332	12,374
Total costs and expenses	218,938	121,913	473,419	78,212
Other income	634	415	1,275	792
Net income	$ 76,186	$ 30,172	$ 124,740	$ 224,571

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