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Fair Value of Financial Instruments (Details) (USD $) | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Assets: |  |
Investments, at fair value | $ 4,692,000 | $ 3,918,000
Fair Value, Measurements, Recurring [Member] | Mark-to-market energy liabilities [Member] |  |
Liabilities: |  |
Liabilities, Fair Value Disclosure | 504,000 | 1,496,000
Fair Value, Measurements, Recurring [Member] | Other Investments [Member] |  |
Assets: |  |
Investments, at fair value | 2,098,000 | 1,734,000
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] |  |
Assets: |  |
Investments, at fair value | 2,594,000 | 2,224,000
Fair Value, Measurements, Recurring [Member] | Mark-to-market energy assets, including put option [Member] |  |
Assets: |  |
Derivative Assets at fair value |  | 1,754,000
Fair Value, Measurements, Recurring [Member] | Mark-to-market energy assets, including call option [Member] |  |
Assets: |  |
Derivative Assets at fair value | 585,000 |
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets, Level 1 [Member] | Other Investments [Member] |  |
Assets: |  |
Investments, at fair value | 2,098,000 | 1,734,000
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets, Level 1 [Member] | Equity Securities [Member] |  |
Assets: |  |
Investments, at fair value | 2,594,000 | 2,224,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs, Level 2 [Member] | Mark-to-market energy liabilities [Member] |  |
Liabilities: |  |
Liabilities, Fair Value Disclosure | 504,000 | 1,496,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs, Level 2 [Member] | Mark-to-market energy assets, including put option [Member] |  |
Assets: |  |
Derivative Assets at fair value |  | 1,754,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs, Level 2 [Member] | Mark-to-market energy assets, including call option [Member] |  |
Assets: |  |
Derivative Assets at fair value | 585,000 |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs, Level 3 [Member] | Mark-to-market energy liabilities [Member] |  |
Liabilities: |  |
Liabilities, Fair Value Disclosure |  |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs, Level 3 [Member] | Other Investments [Member] |  |
Assets: |  |
Investments, at fair value |  |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs, Level 3 [Member] | Equity Securities [Member] |  |
Assets: |  |
Investments, at fair value |  |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs, Level 3 [Member] | Mark-to-market energy assets, including put option [Member] |  |
Assets: |  |
Derivative Assets at fair value |  |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs, Level 3 [Member] | Mark-to-market energy assets, including call option [Member] |  |
Assets: |  |
Derivative Assets at fair value |  |

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- Definition Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -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 FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -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 FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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- Definition Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 15 -Paragraph 83 -URI http://asc.fasb.org/extlink&oid=6913464&loc=d3e34841-113949 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 10 -Subparagraph i -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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 6 -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. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16383099&loc=d3e24584-111560 + Details
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