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Acquisitions (Schedule of Purchase Price Allocation) (Details) (Gulf Of Mexico Crude Oil Pipeline Systems [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Gulf Of Mexico Crude Oil Pipeline Systems [Member]
Business Acquisition [Line Items]
Property and equipment	$ 28,456
Equity investees	182,993
Asset retirement obligation assumed	(5,873)
Total allocation	$ 205,576

The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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- Definition

Amount of acquisition cost of a business combination allocated to other noncurrent assets not separately disclosed.

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