Discontinued Operation (Details) (Refined products segment [Member], USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
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	$ 80,015,000
Operating income (loss) from discontinued operation			(788,000)
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	637,000	59,000
Wind down expenses	$ 171,000