Fixed Assets (Schedule Of Fixed Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fixed Assets, at cost	$ 759,892	$ 723,225
Less: Accumulated depreciation	(168,147)	(157,944)
Net fixed assets	591,745	565,281
Pipelines And Related Assets [Member]
Fixed Assets, at cost	242,806	226,831
Machinery And Equipment [Member]
Fixed Assets, at cost	91,535	87,502
Transportation Equipment [Member]
Fixed Assets, at cost	20,916	21,170
Marine Vessels [Member]
Fixed Assets, at cost	298,077	298,054
Land, Buildings And Improvements [Member]
Fixed Assets, at cost	15,748	15,606
Office Equipment, Furniture And Fixtures [Member]
Fixed Assets, at cost	5,072	4,964
Construction In Progress [Member]
Fixed Assets, at cost	66,470	52,541
Property, Plant And Equipment, Other Types [Member]
Fixed Assets, at cost	$ 19,268	$ 16,557

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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