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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Inventory | Inventory consists of the following:
|  | December 31, |
|  | 2012 |  |  | 2011 |
|  | (In thousands) |
Equipment and materials |  | $ | 16,438 |  |  | $ | 2,709 |
Crude oil inventory |  |  | 4,269 |  |  |  | 834 |
|  | $ | 20,707 |  |  | $ | 3,543 |
Net Changes in Capitalized Exploratory Well Costs | Net changes in capitalized exploratory well costs are reflected in the following table for the periods presented:
|  | December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | (In thousands) |
Beginning of period |  | $ | 20,207 |  |  | $ | 5,176 |  |  | $ | 427 |
Exploratory well cost additions (pending determination of proved reserves) |  |  | 160,813 |  |  |  | 73,947 |  |  |  | 39,708 |
Exploratory well cost reclassifications (successful determination of proved reserves) |  |  | (140,091 | ) |  |  | (57,646 | ) |  |  | (34,959 | )
Exploratory well dry hole costs (unsuccessful in adding proved reserves) |  |  | (505 | ) |  |  | (1,270 | ) |  |  | — |
End of period |  | $ | 40,424 |  |  | $ | 20,207 |  |  | $ | 5,176 |

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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 carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
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