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Properties and Equipment, Net (Tables) | 12 Months Ended
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Dec. 31, 2016
Property, Plant and Equipment [Abstract] |
Components of net property and equipment | Properties and equipment, net are comprised of the following:
| December 31,
(In thousands) | 2016 |  | 2015
Proved oil and gas properties | $ | 7,437,604 |  |  | $ | 8,821,146 |
Unproved oil and gas properties | 260,543 |  |  | 390,434 |
Gathering and pipeline systems | 187,846 |  |  | 243,672 |
Land, building and other equipment | 84,462 |  |  | 117,848 |
| 7,970,455 |  |  | 9,573,100 |
Accumulated depreciation, depletion and amortization | (3,720,330 | ) |  | (4,596,221 | )
| $ | 4,250,125 |  |  | $ | 4,976,879 |
Schedule of net changes in capitalized exploratory well costs | The following table reflects the net changes in capitalized exploratory well costs:
| Year Ended December 31,
(In thousands) | 2016 |  | 2015 |  | 2014
Balance at beginning of period | $ | — |  |  | $ | 10,557 |  |  | $ | — |
Additions to capitalized exploratory well costs pending the determination of proved reserves | — |  |  |  |  |  | 10,557 |
Reclassifications to wells, facilities, and equipment based on the determination of proved reserves | — |  |  | (10,557 | ) |  | — |
Capitalized exploratory well costs charged to expense | — |  |  | — |  |  | — |
Balance at end of period | $ | — |  |  | $ | — |  |  | $ | 10,557 |

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- Definition Tabular disclosure of the change in capitalized exploratory costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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