Discontinued Operations (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	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		$ 25,717,000	$ 169,412,000
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		398,000
Natural gas marketing segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues from discontinued operations	2,377,000	4,879,000	6,251,000
Employee severance and other shut-down costs	$ 416,000