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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2011
Derivatives, Fair Value [Line Items] |
Schedule Of Outstanding Commodity Derivative Contracts Not Designated As Hedges |
|  | September 30, |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
Settlement Period |  | Derivative Instrument |  | Total Notional Amount of Oil (Barrels) |  |  | Average Sub-Floor Price |  |  | Average Floor Price |  |  | Average Ceiling Price |  |  | Average Deferred Premium |  |  | Fair Value Asset (Liability) |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (In thousands) |
2012 |  | Two-Way Collars |  |  | 1,756,718 |  |  |  |  |  |  | $ | 85.49 |  |  | $ | 106.44 |  |  |  |  |  |  | $ | (3,116 | )
2012 |  | Three-Way Collars |  |  | 2,906,500 |  |  | $ | 65.36 |  |  | $ | 89.97 |  |  | $ | 108.24 |  |  |  |  |  |  |  | (2,046 | )
2012 |  | Deferred Puts |  |  | 641,000 |  |  | $ | 72.61 |  |  | $ | 92.61 |  |  |  |  |  |  | $ | 6.10 |  |  |  | (745 | )
2013 |  | Two-Way Collars |  |  | 807,500 |  |  |  |  |  |  | $ | 89.23 |  |  | $ | 111.69 |  |  |  |  |  |  |  | 2,326 |
2013 |  | Three-Way Collars |  |  | 1,887,000 |  |  | $ | 70.19 |  |  | $ | 90.84 |  |  | $ | 112.60 |  |  |  |  |  |  |  | (1,612 | )
2013 |  | Deferred Puts |  |  | 93,000 |  |  | $ | 71.67 |  |  | $ | 91.67 |  |  |  |  |  |  | $ | 6.33 |  |  |  | (33 | )
2014 |  | Two-Way Collars |  |  | 62,000 |  |  |  |  |  |  | $ | 90.00 |  |  | $ | 112.78 |  |  |  |  |  |  |  | 289 |
2014 |  | Three-Way Collars |  |  | 155,000 |  |  | $ | 71.00 |  |  | $ | 91.00 |  |  | $ | 113.04 |  |  |  |  |  |  |  | (113 | )
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | (5,050 | )
Schedule Of Location And Fair Value Of Outstanding Commodity Derivative Contracts |
|  | September 30, |  |  | September 30, |  |  |  | September 30, |
Fair Value of Derivative Instrument Assets (Liabilities) |
|  |  |  | Fair Value December 31, |
Instrument Type |  | Balance Sheet Location |  | 2011 |  |  | 2010 |
|  |  |  | (In thousands) |
Crude oil collar |  | Derivative instruments —non-current assets |  | $ | 4,362 |  |  | $ | — |
Crude oil collar |  | Derivative instruments — current liabilities |  |  | (5,907 | ) |  |  | (6,543 | )
Crude oil collar |  | Derivative instruments — non-current liabilities |  |  | (3,505 | ) |  |  | (3,943 | )
Total derivative instruments |  |  |  | $ | (5,050 | ) |  | $ | (10,486 | )
Commodity Derivative Contracts [Member] |
Derivatives, Fair Value [Line Items] |
Realized And Unrealized Gains And Losses From Commodity Derivative Contracts |
|  | September 30, |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  |  |  | December 31, |
|  | Income Statement Location |  | 2011 |  |  | 2010 |  |  | 2009 |
|  |  |  | (In thousands) |
Change in unrealized gain (loss) on derivative instruments |  | Net gain (loss) on derivative instruments |  | $ | 5,436 |  |  | $ | (7,533 | ) |  | $ | (7,043 | )
Realized gain (loss) on derivative instruments |  | Net gain (loss) on derivative instruments |  |  | (3,841 | ) |  |  | (120 | ) |  |  | 2,296 |
Total net gain (loss) on derivative instruments |  |  |  | $ | 1,595 |  |  | $ | (7,653 | ) |  | $ | (4,747 | )

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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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