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Properties and Equipment, Net | 12 Months Ended
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Dec. 31, 2018
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) | 2018 |  | 2017
Proved oil and gas properties | $ | 5,717,145 |  |  | $ | 4,932,512 |
Unproved oil and gas properties | 194,435 |  |  | 190,474 |
Gathering and pipeline systems | 83 |  |  | 1,569 |
Land, building and other equipment | 94,714 |  |  | 82,670 |
| 6,006,377 |  |  | 5,207,225 |
Accumulated depreciation, depletion and amortization | (2,542,771 | ) |  | (2,135,021 | )
| $ | 3,463,606 |  |  | $ | 3,072,204 |
Assets Held for Sale In December 2017, the Company entered into an agreement to sell certain proved and unproved oil and gas properties in the Haynesville Shale to a third party for $30.0 million and classified these assets as held for sale. The Company closed this transaction in July 2018. In December 2017, the Company entered into an agreement to sell certain proved and unproved oil and gas properties in the Eagle Ford Shale to an affiliate of Venado Oil & Gas LLC for $765.0 million and classified these assets as held for sale. The Company closed this transaction in February 2018. Balance sheet data related to the assets held for sale is as follows:
(In thousands) |  | December 31, 2017
ASSETS |  |
Inventories |  | $ | 1,440 |
Properties and equipment, net |  | 778,855 |
|  | 780,295 |
LIABILITIES |  |
Accounts payable |  | 2,352 |
Asset retirement obligations |  | 15,748 |
|  | 18,100 |
Net assets held for sale |  | $ | 762,195 |
The assets held for sale as of December 31, 2017 do not qualify for discontinued operations as they do not represent a strategic shift that will have a major effect of the Company's operations or financial results. Impairment of Oil and Gas Properties In December 2017, the Company recorded an impairment of $414.3 million associated with its Eagle Ford Shale oil and gas properties located in south Texas. The impairment of these properties was due to the anticipated sale of these assets, as demonstrated by the execution of a purchase and sale agreement with a third party on December 19, 2017. These assets were designated as held for sale and were reduced to fair value of approximately $765.6 million. In June 2017, the Company recorded an impairment of $68.6 million associated with its proposed sale of oil and gas properties and related pipeline assets located in West Virginia, Virginia and Ohio. These assets were designated as held for sale as of June 30, 2017 and were reduced to fair value of approximately $37.9 million. In December 2016, the Company recorded an impairment of $435.6 million associated with oil and gas properties and related pipeline assets located in West Virginia and Virginia. In the fourth quarter of 2016, although oil and natural gas prices had improved since late 2015, the Company performed an impairment test of its West Virginia and Virginia fields because it had then determined that it was more likely than not that the Company would dispose of these assets significantly earlier than their remaining expected useful life. As a result of its step one assessment, which was based on a probability weighted assessment that considered the anticipated disposition of these assets earlier than their remaining expected useful life, the Company determined that these assets were impaired, which resulted in an impairment charge of $435.6 million. These assets were reduced to fair value of approximately $89.2 million. The fair value of the impaired assets in 2017 was determined using a market approach that took into consideration the expected sales price included in the respective purchase and sale agreements the Company executed in June and December 2017. Accordingly, the inputs associated with the fair value of these assets were considered Level 3 in the fair value hierarchy. Refer to Note 1 for a description of fair value hierarchy. The fair value of the impaired assets in 2016 was determined using a market approach that took into consideration the preliminary purchase price included in a draft purchase and sale agreement that was under negotiation with a potential buyer as of December 31, 2016. Accordingly, the inputs associated with the fair value of these assets were considered Level 3 in the fair value hierarchy. Refer to Note 1 for a description of fair value hierarchy. Capitalized Exploratory Well Costs The following table reflects the net changes in capitalized exploratory well costs:
| Year Ended December 31,
(In thousands) | 2018 |  | 2017 |  | 2016
Balance at beginning of period | $ | 19,511 |  |  | $ | — |  |  | $ | — |
Additions to capitalized exploratory well costs pending the determination of proved reserves | — |  |  | 19,511 |  |  | — |
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 | $ | — |  |  | $ | 19,511 |  |  | $ | — |
The following table provides an aging of capitalized exploratory well costs based on the date the drilling was completed:
| December 31,
(In thousands) | 2018 |  | 2017 |  | 2016
Capitalized exploratory well costs that have been capitalized for a period of one year or less | $ | — |  |  | $ | 19,511 |  |  | $ | — |
Capitalized exploratory well costs that have been capitalized for a period greater than one year | — |  |  | — |  |  | — |
| $ | — |  |  | $ | 19,511 |  |  | $ | — |

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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