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Properties and Equipment, Net (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2012
Properties and Equipment, Net |
Components of net property, plant, and equipment |
|  | December 31, |
--- | --- | --- | ---
(In thousands) |  | 2012 |  | 2011 |
Proved oil and gas properties |  | $ | 5,724,940 |  | $ | 5,006,846 |
Unproved oil and gas properties |  |  | 467,483 |  |  | 478,942 |
Gathering and pipeline systems |  |  | 239,656 |  |  | 238,660 |
Land, building and other equipment |  |  | 86,137 |  |  | 80,908 |
|  |  | 6,518,216 |  |  | 5,805,356 |
Accumulated depreciation, depletion and amortization |  |  | (2,207,239 | ) |  | (1,870,772 | )
|  | $ | 4,310,977 |  | $ | 3,934,584 |
Schedule of net changes in capitalized exploratory well costs |
|  | Year Ended December 31, |
--- | --- | --- | ---
(In thousands) |  | 2012 |  | 2011 |  | 2010 |
Beginning balance at January 1 |  | $ | 5,328 |  | $ | 4,285 |  | $ | 4,179 |
Additions to capitalized exploratory well costs pending the determination of proved reserves |  |  | 10,390 |  |  | 5,328 |  |  | 4,285 |
Reclassifications to wells, facilities, and equipment based on the determination of proved reserves |  |  | — |  |  | (1,138 | ) |  | (4,148 | )
Capitalized exploratory well costs charged to expense |  |  | (5,328 | ) |  | (3,147 | ) |  | (31 | )
Ending balance at December 31 |  | $ | 10,390 |  | $ | 5,328 |  | $ | 4,285 |
Schedule of aging of capitalized exploratory well costs |
|  | December 31, |
--- | --- | --- | ---
(In thousands) |  | 2012 |  | 2011 |  | 2010 |
Capitalized exploratory well costs that have been capitalized for a period of one year or less |  | $ | 10,390 |  | $ | 5,328 |  | $ | 4,285 |
Capitalized exploratory well costs that have been capitalized for a period greater than one year |  |  | — |  |  | — |  |  | — |
|  | $ | 10,390 |  | $ | 5,328 |  | $ | 4,285 |

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- Definition Tabular disclosure of the change in capitalized exploratory costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + Details
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- Definition Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -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 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of the amount of exploratory well costs that have been capitalized after the completion of drilling and the number of projects for which those costs relate. Additionally, for exploratory well costs that have been capitalized for periods greater than one year at the most recent balance sheet date, this block of text may be used to disclose an aging of those amounts by year, or by using a range of years, and the number of projects to which those costs relate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS19-1 -Paragraph 10 -Subparagraph 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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