Discontinued Operations (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
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			808,000
Pre-tax earnings from discontinued operation	553,000
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
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
Cash proceeds for sale	$ 664,000