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Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Taxes (Textual) [Abstract]
U.S. federal statutory rate	35.00%
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 50.9
Effective Income Tax Rate, Continuing Operations	987.00%	(120.00%)
Semcrude Pipeline [Member]
Equity Method Investment, Ownership Percentage	33.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

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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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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