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Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2012
Derivatives, Fair Value [Line Items] |
Schedule Of Outstanding Commodity Derivative Instruments |
Settlement Period |  | Derivative Instrument |  | Total Notional Amount of Oil (Barrels) |  |  | Average Sub-Floor Price |  |  | Average Floor Price |  |  | Average Ceiling Price |  |  | Fair Value Asset (Liability) |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (In thousands) |
2012 |  | Two-Way Collars |  |  | 1,237,500 |  |  |  |  |  |  | $ | 85.56 |  |  | $ | 106.50 |  |  | $ | (5,427 | )
2012 |  | Three-Way Collars |  |  | 2,872,000 |  |  | $ | 66.62 |  |  | $ | 90.45 |  |  | $ | 109.14 |  |  |  | (7,471 | )
2013 |  | Two-Way Collars |  |  | 807,500 |  |  |  |  |  |  | $ | 89.23 |  |  | $ | 111.69 |  |  |  | (1,646 | )
2013 |  | Three-Way Collars |  |  | 2,404,500 |  |  | $ | 69.33 |  |  | $ | 91.61 |  |  | $ | 113.25 |  |  |  | (7,338 | )
2014 |  | Two-Way Collars |  |  | 62,000 |  |  |  |  |  |  | $ | 90.00 |  |  | $ | 112.78 |  |  |  | 1 |
2014 |  | Three-Way Collars |  |  | 186,000 |  |  | $ | 70.00 |  |  | $ | 91.67 |  |  | $ | 113.58 |  |  |  | (464 | )
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | (22,345 | )
Schedule Of Location And Fair Value Of Outstanding Commodity Derivative Instruments |
Fair Value of Derivative Instrument Assets (Liabilities) |
|  |  |  | Fair Value |
Instrument Type |  | Balance Sheet Location |  | March 31, 2012 |  |  | December 31, 2011 |
|  |  |  | (In thousands) |
Crude oil collar |  | Other current assets — current assets |  | $ | 72 |  |  | $ | — |
Crude oil collar |  | Derivative instruments — non-current assets |  |  | 486 |  |  |  | 4,362 |
Crude oil collar |  | Derivative instruments — current liabilities |  |  | (16,469 | ) |  |  | (5,907 | )
Crude oil collar |  | Derivative instruments — non-current liabilities |  |  | (6,434 | ) |  |  | (3,505 | )
Total derivative instruments |  |  |  | $ | (22,345 | ) |  | $ | (5,050 | )
Commodity Derivative Instruments [Member] |
Derivatives, Fair Value [Line Items] |
Realized And Unrealized Gains And Losses From Commodity Derivative Instruments |
|  |  |  | Three Months Ended March 31, |
|  | Income Statement Location |  | 2012 |  |  | 2011 |
|  |  |  | (In thousands) |
Change in unrealized loss on derivative instruments |  | Net loss on derivative instruments |  | $ | (17,295 | ) |  | $ | (31,154 | )
Realized loss on derivative instruments |  | Net loss on derivative instruments |  |  | (1,291 | ) |  |  | (512 | )
Total net loss on derivative instruments |  |  |  | $ | (18,586 | ) |  | $ | (31,666 | )

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41620-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41641-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579240-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41678-113959 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41638-113959 + Details
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- Definition Tabular disclosure for other derivative instruments not designated as hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 815 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (e) -Name Accounting Standards Codification -Paragraph 4C -Section 50 -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 + Details
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