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Supplemental Oil and Gas Disclosures | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016
| (In thousands)
Proved oil and gas properties(1) | $ | 7,058,782 |  |  | $ | 6,476,833 |
Less: Accumulated depreciation, depletion, amortization and impairment | (2,395,153 | ) |  | (1,886,732 | )
Proved oil and gas properties, net | 4,663,629 |  |  | 4,590,101 |
Unproved oil and gas properties | 780,173 |  |  | 819,735 |
Total oil and gas properties, net | $ | 5,443,802 |  |  | $ | 5,409,836 |
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(1) | Includ ed in the Company’s proved oil and gas properties are estimates of future asset retirem ent costs of $39.9 million and $42.9 million at December 31, 2017 and 2016, 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 periods presented:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In thousands)
Acquisition costs: |  |  |  |  |
Proved oil and gas properties | $ | 61,874 |  |  | $ | 781,522 |  |  | $ | 28,737 |
Unproved oil and gas properties | 5,424 |  |  | 672 |  |  | 3,226 |
Exploration costs | 11,600 |  |  | 1,792 |  |  | 2,369 |
Development costs | 511,905 |  |  | 207,766 |  |  | 433,735 |
Asset retirement costs | (2,965 | ) |  | 26,795 |  |  | 1,474 |
Total costs incurred | $ | 587,838 |  |  | $ | 1,018,547 |  |  | $ | 469,541 |
Results of Operations for Oil and Natural Gas Producing Activities The following table sets forth the results of operations for oil and natural gas producing activities, which exclude straight-line depreciation, general and administrative expenses and interest expense, for the periods presented:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In thousands)
Revenues | $ | 1,034,892 |  |  | $ | 625,233 |  |  | $ | 721,672 |
Production costs | 321,007 |  |  | 222,117 |  |  | 245,675 |
Depreciation, depletion and amortization | 515,600 |  |  | 462,320 |  |  | 472,800 |
Exploration costs | 11,600 |  |  | 1,785 |  |  | 2,369 |
Rig termination | — |  |  | — |  |  | 3,895 |
Impairment | 6,887 |  |  | 2,252 |  |  | 46,109 |
Income tax expense (benefit) | 67,244 |  |  | (23,665 | ) |  | (18,382 | )
Results of operations for oil and natural gas producing activities | $ | 112,554 |  |  | $ | (39,576 | ) |  | $ | (30,794 | )

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -URI http://asc.fasb.org/subtopic&trid=2145654 + Details
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