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Related Party Transactions (Commercial Agreements) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Western Refining, Inc. [Member] Pipeline and Gathering Services Agreement [Member]	Dec. 31, 2013 Western Refining, Inc. [Member] Terminalling, Transportation and Storage Services Agreement [Member]
Related Party Transaction [Line Items]
Revenues, affiliate	$ 28,928	$ 3,167	$ 2,439	$ 5,700	$ 19,800

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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