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Suspended Exploratory Well Costs (Tables) | 6 Months Ended
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Jun. 30, 2013
Suspended Exploratory Well Costs |
| June 30, 2013 |  |  | December 31, 2012 |
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Balance at beginning of period | $ |  | 57,360 |  |  | $ |  | 93,388 |
Additions to capitalized exploratory well costs pending the determination of proved reserves |  | 41,405 |  |  |  | 153,250 |
Reclassifications to wells, facilities and equipment based on determination of proved reserves |  | (66,221 | ) |  |  | (184,298 | )
Divested wells |  | — |  |  |  | (4,980 | )
Balance at end of period |  | 32,544 |  |  |  | 57,360 |
Less exploratory well costs that have been capitalized for a period of one year or less |  | (12,025 | ) |  |  | (45,965 | )
Capitalized exploratory well costs that have been capitalized for a period greater than one year | $ |  | 20,519 |  |  | $ |  | 11,395 |
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year |  | 8 |  |  |  | 5 |
Aging of Capitalized Exploratory Well Costs Suspended More Than One Year |
| Total |  |  | 2013 |  |  | 2012 |  |  | 2011 |  |  | 2010 |  |  | 2009 |  |  | 2008 |
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Capitalized exploratory well costs that have been capitalized for more than one year | $ |  | 2 0,519 |  |  | $ |  | 3,828 |  |  | $ |  |  | 6,96 5 |  |  | $ |  |  | 5,247 |  |  | $ |  |  | 72 |  |  | $ |  |  | 2,884 |  |  | $ |  |  | 1,523 |

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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 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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