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Supplemental Oil and Gas Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2017
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,
| 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 |
__________________
(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 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=68064819&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=68064819&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=68064819&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=68064819&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=68064819&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=68064819&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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