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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Event The Bipartisan Budget Act of 2018 was passed by Congress and signed into law on February 9, 2018, retroactively extending the biodiesel blenders tax credit for 2017. As a result, the Company expects to record an estimated net amount of $100 million to $130 million in pre-tax earnings in the first quarter of 2018.