Acquisitions and Merger (Details) $ / shares in Units, gal in Millions				12 Months Ended
	Jan. 10, 2019 USD ($) $ / shares	Nov. 15, 2018 USD ($) plant gal	May 14, 2018 USD ($) MBbls	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Acquisitions and Merger (Textual)
Amount paid from available cash on hand				$ 468,000,000	$ 0	$ 0
Goodwill				260,000,000	0
Ethanol Plants [Member]
Acquisitions and Merger (Textual)
Working capital		$ 20,000,000
Acquisition agreement, number of ethanol plants | plant		3
Acquisition agreement, total cash consideration		$ 320,000,000		$ 320,000,000	$ 0	$ 0
Acquisition agreement, combined ethanol production capacity per year | gal		280
Pure Biofuels [Member]
Acquisitions and Merger (Textual)
Percent equity interests acquired			100.00%
Amount paid from available cash on hand			$ 468,000,000
Working capital			132,000,000
Identifiable intangible assets			200,000,000
Goodwill			$ 260,000,000
Amortization period of identifiable intangible assets			10 years
Total amount of goodwill deductible for tax purposes			$ 0
Pure Biofuels [Member] | Port of Callao Terminal [Member]
Acquisitions and Merger (Textual)
Approximate storage capacity of terminal (in thousands of barrels) | MBbls			1,000
Pure Biofuels [Member] | Paita Terminal [Member]
Acquisitions and Merger (Textual)
Approximate storage capacity of terminal (in thousands of barrels) | MBbls			180
VLP [Member] | Subsequent Event [Member]
Acquisitions and Merger (Textual)
Merger Transaction, price per common unit (in usd per unit) | $ / shares	$ 42.25
Merger Transaction, aggregate merger consideration funded with available cash on hand	$ 950,000,000