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Supplemental Oil and Gas Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2015
Oil and Gas Exploration and Production Industries Disclosures [Abstract] |
Capitalized Costs Related to Oil and Natural Gas Producing Activities | The following table sets forth the capitalized costs related to the Company’s oil and natural gas producing activities at December 31, 2015 and 2014:
| December 31,
| 2015(1) |  | 2014
| (In thousands)
Proved oil and gas properties(2) | $ | 5,655,759 |  |  | $ | 5,156,875 |
Less: Accumulated depreciation, depletion, amortization and impairment | (1,428,427 | ) |  | (1,043,121 | )
Proved oil and gas properties, net | 4,227,332 |  |  | 4,113,754 |
Unproved oil and gas properties | 628,642 |  |  | 809,265 |
Total oil and gas properties, net | $ | 4,855,974 |  |  | $ | 4,923,019 |
__________________
(1) | At December 31, 2015, oil and gas properties exclude capitalized costs related to certain non-core assets that were held for sale (see Note 7 — Assets Held for Sale).
(2) | Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $30.7 million and $36.9 million at December 31, 2015 and 2014, 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, 2015, 2014 and 2013:
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
| (In thousands)
Acquisition costs: |  |  |  |  |
Proved oil and gas properties | $ | 28,737 |  |  | $ | 37,048 |  |  | $ | 752,454 |
Unproved oil and gas properties | 3,226 |  |  | 30,891 |  |  | 837,419 |
Exploration costs | 2,369 |  |  | 3,064 |  |  | 2,260 |
Development costs | 433,735 |  |  | 1,437,923 |  |  | 890,267 |
Asset retirement costs | 1,474 |  |  | 6,278 |  |  | 11,856 |
Total costs incurred | $ | 469,541 |  |  | $ | 1,515,204 |  |  | $ | 2,494,256 |
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,
| 2015 |  | 2014 |  | 2013
| (In thousands)
Revenues | $ | 721,672 |  |  | $ | 1,304,004 |  |  | $ | 1,084,412 |
Production costs | 245,675 |  |  | 326,381 |  |  | 221,095 |
Depreciation, depletion and amortization | 472,800 |  |  | 400,118 |  |  | 298,999 |
Exploration costs | 2,369 |  |  | 3,064 |  |  | 2,260 |
Rig termination | 3,895 |  |  | — |  |  | — |
Impairment of oil and gas properties | 46,109 |  |  | 47,238 |  |  | 1,168 |
Income tax expense (benefit) | (18,382 | ) |  | 197,701 |  |  | 196,312 |
Results of operations for oil and natural gas producing activities | $ | (30,794 | ) |  | $ | 329,502 |  |  | $ | 364,578 |

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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 13 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61901-109447 Reference 2: 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=34713648&loc=d3e63019-109448 Reference 3: 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=51678428&loc=d3e61929-109447 Reference 4: 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=51678428&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 55 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63042-109448 Reference 2: 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=51678428&loc=d3e62059-109447 Reference 3: 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=51678428&loc=d3e62038-109447 Reference 4: 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=51678428&loc=d3e62014-109447 Reference 5: 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 + Details
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