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Property, Plant and Equipment | 3 Months Ended
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Mar. 31, 2019
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment The following table sets forth the Company’s property, plant and equipment:
| March 31, 2019 |  | December 31, 2018
| (In thousands)
Proved oil and gas properties(1) | $ | 8,039,585 |  |  | $ | 7,878,104 |
Less: Accumulated depreciation, depletion, amortization and impairment | (3,035,748 | ) |  | (2,853,353 | )
Proved oil and gas properties, net | 5,003,837 |  |  | 5,024,751 |
Unproved oil and gas properties | 1,033,500 |  |  | 1,034,085 |
Other property and equipment(2) | 1,216,763 |  |  | 1,151,772 |
Less: Accumulated depreciation | (197,358 | ) |  | (183,499 | )
Other property and equipment, net | 1,019,405 |  |  | 968,273 |
Total property, plant and equipment, net | $ | 7,056,742 |  |  | $ | 7,027,109 |
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(1) | Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $41.6 million and $40.5 million at March 31, 2019 and December 31, 2018, respectively.
(2) | Included in the Company’s other property and equipment are estimates of future asset retirement costs of $1.4 million and $1.3 million at March 31, 2019 and December 31, 2018, respectively.

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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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