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Properties and Equipment, Net | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Properties and Equipment, Net | Properties and Equipment, Net Properties and equipment, net are comprised of the following:
| December 31,
(In thousands) | 2020 |  | 2019
Proved oil and gas properties | $ | 7,068,605 |  |  | $ | 6,508,443 |
Unproved oil and gas properties | 49,829 |  |  | 133,475 |
Land, buildings and other equipment | 92,566 |  |  | 104,700 |
| 7,211,000 |  |  | 6,746,618 |
Accumulated depreciation, depletion and amortization | (3,166,394) |  |  | (2,890,912) |
| $ | 4,044,606 |  |  | $ | 3,855,706 |
Capitalized Exploratory Well Costs The following table reflects the net changes in capitalized exploratory well costs:
| Year Ended December 31,
(In thousands) | 2020 |  | 2019 |  | 2018
Balance at beginning of period | $ | — |  |  | $ | — |  |  | $ | 19,511 |
Additions to capitalized exploratory well costs pending the determination of proved reserves | — |  |  | — |  |  | — |
Reclassifications to wells, facilities, and equipment based on the determination of proved reserves | — |  |  | — |  |  | — |
Capitalized exploratory well costs charged to expense | — |  |  | — |  |  | (19,511) |
Balance at end of period | $ | — |  |  | $ | — |  |  | $ | — |
The following table provides an aging of capitalized exploratory well costs based on the date the drilling was completed:
| December 31,
(In thousands) | 2020 |  | 2019 |  | 2018
Capitalized exploratory well costs that have been capitalized for a period of one year or less | $ | — |  |  | $ | — |  |  | $ | — |
Capitalized exploratory well costs that have been capitalized for a period greater than one year | — |  |  | — |  |  | — |
| $ | — |  |  | $ | — |  |  | $ | — |

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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