Subsequent Events (Notes)

3 Months Ended

Mar. 31, 2017

Subsequent Events [Abstract]

Subsequent Events [Text Block]

17. Subsequent Events

On April 17, 2017, Tesoro filed an Amendment to Schedule 13D with the SEC stating that the board of directors of Tesoro authorized the management of Tesoro to work with the board of directors and management of Tesoro Logistics LP ("TLLP") to consider, discuss and endeavor to negotiate a merger, consolidation or combination (in whatever form) of assets held by and securities issued by TLLP and its affiliates and assets held by and securities issued by WNRL. Any such transaction would be conditioned on the closing of the Tesoro Merger. There can be no assurance that any discussions that may occur between TLLP and WNRL will result in the delivery of a proposal, or entry into a definitive agreement, concerning a transaction or, if such a definitive agreement is reached, will result in the consummation of a transaction provided for in such definitive agreement. If any discussions concerning a potential transaction occur, such discussions may be terminated at any time and without prior notice.