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Supplemental Oil and Gas Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2012
Capitalized Costs Related to Oil and Natural Gas Producing Activities | Capitalized Costs The following table sets forth the capitalized costs related to the Company’s oil and natural gas producing activities at December 31, 2012 and 2011:
|  | December 31, |
|  | 2012 |  |  | 2011 |
|  | (In thousands) |
Proved oil and gas properties |  | $ | 2,271,711 |  |  | $ | 1,152,532 |
Less: Accumulated depreciation, depletion, amortization and impairment |  |  | (383,564 | ) |  |  | (174,948 | )
Proved oil and gas properties, net |  |  | 1,888,147 |  |  |  | 977,584 |
Unproved oil and gas properties |  |  | 76,417 |  |  |  | 82,825 |
Total oil and gas properties, net |  | $ | 1,964,564 |  |  | $ | 1,060,409 |
Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development Activities | The following table sets forth costs incurred related to the Company’s oil and natural gas activities for the years ended December 31, 2012, 2011 and 2010:
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | (In thousands) |
Acquisition costs: |  |  |  |  |  |  |  |  |  |  |  |
Proved oil and gas properties |  | $ | 3,159 |  |  | $ | 3,356 |  |  | $ | 20,259 |
Unproved oil and gas properties |  |  | 34,098 |  |  |  | 15,197 |  |  |  | 81,624 |
Exploration costs |  |  | 3,250 |  |  |  | 1,685 |  |  |  | 297 |
Development costs |  |  | 1,074,441 |  |  |  | 618,737 |  |  |  | 243,758 |
Asset retirement costs |  |  | 9,359 |  |  |  | 5,055 |  |  |  | 968 |
Total costs incurred |  | $ | 1,124,307 |  |  | $ | 644,030 |  |  | $ | 346,906 |
Results of Operations for Oil and Natural Gas Producing Activities | Results of operations for oil and natural gas producing activities, which excludes straight-line depreciation, general and administrative expenses and interest expense, are presented below.
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | (In thousands) |
Revenues |  | $ | 670,491 |  |  | $ | 330,422 |  |  | $ | 128,927 |
Production costs |  |  | 127,146 |  |  |  | 67,937 |  |  |  | 28,350 |
Depreciation, depletion and amortization |  |  | 202,398 |  |  |  | 74,101 |  |  |  | 37,583 |
Exploration costs |  |  | 3,250 |  |  |  | 1,685 |  |  |  | 297 |
Impairment of oil and gas properties |  |  | 3,581 |  |  |  | 3,610 |  |  |  | 11,967 |
Loss on sale of properties |  |  | — |  |  |  | 207 |  |  |  | — |
Income tax expenses |  |  | 116,941 |  |  |  | 64,009 |  |  |  | 17,756 |
Results of operations for oil and gas producing activities |  | $ | 217,175 |  |  | $ | 118,873 |  |  | $ | 32,974 |

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- Definition Tabular disclosure of aggregate capitalized costs relating to an enterprise's oil and gas producing activities and the aggregate related accumulated depreciation, depletion, amortization, and valuation allowances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=8451751&loc=d3e63019-109448 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61929-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59M -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61926-109447 + Details
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- Definition Tabular disclosure of the aggregate of costs (whether the costs are capitalized or charged to expense at the time they are incurred ) incurred for the year in oil and gas property acquisition, exploration and development activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62038-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59P, 59Q, 59R -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8451751&loc=d3e63042-109448 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62059-109447 + Details
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