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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Summary Of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Impairment of intangible assets	$ 0
Impairment of goodwill	$ 0us-gaap_GoodwillImpairmentLoss	$ 0us-gaap_GoodwillImpairmentLoss
Poseidon Oil Pipeline Company, L.L.C. [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage	28.00%
Odyssey Pipeline L.L.C. [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage	29.00%
CHOPS [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage	50.00%
SEKCO [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage	50.00%
Minimum [Member] \| Pipelines And Related Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of assets	5 years
Minimum [Member] \| Marine Vessels [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of assets	20 years
Minimum [Member] \| Machinery And Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of assets	10 years
Minimum [Member] \| Transportation Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of assets	3 years
Minimum [Member] \| Building And Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of assets	3 years
Maximum [Member] \| Pipelines And Related Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of assets	40 years
Maximum [Member] \| Marine Vessels [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of assets	30 years
Maximum [Member] \| Machinery And Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of assets	20 years
Maximum [Member] \| Transportation Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of assets	7 years
Maximum [Member] \| Building And Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of assets	10 years