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Supplemental Oil and Gas Disclosures | 12 Months Ended
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Dec. 31, 2015
Oil and Gas Exploration and Production Industries Disclosures [Abstract] |
Supplemental Oil and Gas Disclosures | Supplemental Oil and Gas Disclosures The supplemental data presented below reflects information for all of the Company’s 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, 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 |
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(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 The entire disclosure for properties used in normal conduct of oil and gas exploration and producing operations. This disclosure may include property accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives. + References No definition available. + Details
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