This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6382870&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Principles Board Opinion (APB)

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-Paragraph 19

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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-Article 7

Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.12)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

Discontinued Operations (Details Textuals) (USD $)	3 Months Ended		9 Months Ended
Discontinued Operations (Details Textuals) (USD $)	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Schedule of Equity Method Investments [Line Items]
Company's ownership interest for investments	50.00%		50.00%
Cash proceeds from affiliate, from sale of oil and gas assets			$ 89,200,000
Operating revenues and Earnings (losses) from unconsolidated affiliates	3,684,000	3,556,000	101,966,000	20,680,000
Earnings (losses) from unconsolidated affiliates	33,723,000	11,842,000	59,304,000	28,329,000
Discontinued Operations (Textuals) [Abstract]
Gain on disposal of assets			39,900,000
Cash distribution from the sale of oil and gas assets			142,984,000
Remora Energy International L P [Member]
Schedule of Equity Method Investments [Line Items]
Company's ownership interest for investments		49.70%		49.70%
Cash proceeds from affiliate, from sale of oil and gas assets			279,000,000
Earnings (losses) from unconsolidated affiliates			$ 85,000,000
Stone Mountain Ventures Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Company's ownership interest for investments		50.00%		50.00%