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Supplemental Oil and Gas Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2013
Supplemental Oil and Gas Disclosures [Abstract] |
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, 2013 and 2012:
| December 31,
| 2013(1) |  | 2012
| (In thousands)
Proved oil and gas properties(2) | $ | 3,713,525 |  |  | $ | 2,271,711 |
Less: Accumulated depreciation, depletion, amortization and impairment | (612,380 | ) |  | (383,564 | )
Proved oil and gas properties, net | 3,101,145 |  |  | 1,888,147 |
Unproved oil and gas properties | 815,433 |  |  | 76,417 |
Total oil and gas properties, net | $ | 3,916,578 |  |  | $ | 1,964,564 |
(1) | At December 31, 2013, oil and gas properties exclude capitalized costs related to certain assets in and around the Company’s Sanish project area, which were held for sale.
(2) | Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $32.6 million and $20.7 million at December 31, 2013 and 2012, respectively.
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, 2013, 2012 and 2011:
| Year Ended December 31,
| 2013 |  | 2012 |  | 2011
| (In thousands)
Acquisition costs: |  |  |  |  |
Proved oil and gas properties | $ | 752,454 |  |  | $ | 3,159 |  |  | $ | 3,356 |
Unproved oil and gas properties | 837,419 |  |  | 34,098 |  |  | 15,197 |
Exploration costs | 2,260 |  |  | 3,250 |  |  | 1,685 |
Development costs | 890,267 |  |  | 1,074,441 |  |  | 618,737 |
Asset retirement costs | 11,856 |  |  | 9,359 |  |  | 5,055 |
Total costs incurred | $ | 2,494,256 |  |  | $ | 1,124,307 |  |  | $ | 644,030 |
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,
| 2013 |  | 2012 |  | 2011
| (In thousands)
Revenues | $ | 1,084,412 |  |  | $ | 670,491 |  |  | $ | 330,422 |
Production costs | 221,095 |  |  | 127,146 |  |  | 67,937 |
Depreciation, depletion and amortization | 298,999 |  |  | 202,398 |  |  | 74,101 |
Exploration costs | 2,260 |  |  | 3,250 |  |  | 1,685 |
Impairment of oil and gas properties | 1,168 |  |  | 3,581 |  |  | 3,610 |
Loss on sale of properties | — |  |  | — |  |  | 207 |
Income tax expense | 196,312 |  |  | 116,941 |  |  | 64,009 |
Results of operations for oil and natural gas producing activities | $ | 364,578 |  |  | $ | 217,175 |  |  | $ | 118,873 |

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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 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61929-109447 Reference 2: 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 Reference 3: 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 4: 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 + 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 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: 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 3: 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 Reference 4: 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 5: 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 + Details
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