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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2012
Fair Value of Financial Instruments [Abstract] |
Financial assets and liabilities measured at fair value on recurring basis |
|  |  |  |  | Fair Value Measurements Using: |
|  |  |  |  |  |  |  | Significant Other |  |  | Significant |
|  |  |  |  | Quoted Prices in |  |  | Observable |  |  | Unobservable |
|  |  |  |  | Active Markets |  |  | Inputs |  |  | Inputs |
(in thousands) |  | Fair Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments—equity securities |  | $ | 2,594 |  |  | $ | 2,594 |  |  | $ | — |  |  | $ | — |
Investments—other |  | $ | 2,097 |  |  | $ | 2,098 |  |  | $ | — |  |  | $ | — |
Mark-to-market energy assets, including call option |  | $ | 585 |  |  | $ | — |  |  | $ | 585 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mark-to-market energy liabilities |  | $ | 504 |  |  | $ | — |  |  | $ | 504 |  |  | $ | — |
|  |  |  |  | Fair Value Measurements Using: |
|  |  |  |  |  |  |  | Significant Other |  |  | Significant |
|  |  |  |  | Quoted Prices in |  |  | Observable |  |  | Unobservable |
|  |  |  |  | Active Markets |  |  | Inputs |  |  | Inputs |
(in thousands) |  | Fair Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments—equity securities |  | $ | 2,224 |  |  | $ | 2,224 |  |  | $ | — |  |  | $ | — |
Investments—other (1) |  | $ | 1,734 |  |  | $ | 1,734 |  |  | $ | — |  |  | $ | — |
Mark-to-market energy assets, including put option |  | $ | 1,754 |  |  | $ | — |  |  | $ | 1,754 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mark-to-market energy liabilities |  | $ | 1,496 |  |  | $ | — |  |  | $ | 1,496 |  |  | $ | — |
(1) | The current portion of this investment ($40) is included in other current assets in the accompanying consolidated balance sheets.

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- Definition Tabular disclosure related to assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a recurring and/or nonrecurring basis in periods after initial recognition. Disclosures include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3) as well as transfers between levels 1 and 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 4 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a,b,bb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -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 Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=7578670&loc=SL7498348-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -Subparagraph a, b -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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