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Discontinued Operation (Details) (Refined products segment [Member], USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2012
Refined products segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues from discontinued operations	$ 25,633,000
Proceeds from sale of contracts and certain equipment		2,000,000
Proceeds from sale of inventory		1,546,000
Gain (loss) on disposal of discontinued operation		1,622,000
Pre-tax earnings from discontinued operation	$ 808,000

- Definition

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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- Definition

Pretax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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