Fixed Assets And Asset Retirement Obligations (Schedule Of Fixed Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 541,138	$ 373,339
Accumulated depreciation	(124,213)	(108,283)
Net fixed assets	416,925	265,056
Land, Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	13,140	14,335
Pipelines And Related Assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	167,865	156,805
Marine Vessels [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	262,216	122,992
Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46,233	29,433
Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,732	29,249
Office Equipment, Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,778	3,742
Construction In Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	14,236	4,493
Property, Plant And Equipment, Other Types [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 11,938	$ 12,290

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, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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