Related-Party Transactions, Agreements (Details) bbl in Thousands	Mar. 31, 2017 bbl	Jan. 18, 2017 renewal bbl
Agreement with Diamond Green Diesel [Member]
Related Party Agreements and Transactions (Textual)
Volume of storage tank (barrels)	180
Agreement expiration date, initial term	Jun. 30, 2033
Red River Crude System [Member] | Pipelines [Member]
Related Party Agreements and Transactions (Textual)
Volume of storage tank (barrels)		150
Red River Crude System [Member] | Pipelines [Member] | Agreements With Valero [Member]
Related Party Agreements and Transactions (Textual)
Duration of agreement		10 years
Number of renewal options | renewal		1
Duration of renewal option		5 years
Prior written notice		180 days