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Fair-Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2012
Fair-Value Measurements [Abstract] |
Placement Of Assets And Liabilities Within The Fair Value Hierarchy Levels |
|  | Fair Value at March 31, 2012 |  |  | Fair Value at December 31, 2011 |
Recurring Fair Value Measures |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Commodity derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  | $ | 425 |  |  | $ | — |  |  | $ | — |  |  | $ | 306 |  |  | $ | — |  |  | $ | — |
Liabilities |  | $ | (947 | ) |  | $ | — |  |  | $ | — |  |  | $ | (2,820 | ) |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 820 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258 + Details
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