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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2017
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:
| 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 |
Other property and equipment | 868,746 |  |  | 618,790 |
Less: Accumulated depreciation | (139,062 | ) |  | (109,059 | )
Other property and equipment, net | 729,684 |  |  | 509,731 |
Total property, plant and equipment, net | $ | 6,173,486 |  |  | $ | 5,919,567 |
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(1) | Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $39.9 million and $42.9 million at December 31, 2017 and 2016, respectively.
Impairment. The Company reviews its proved oil and natural gas properties for impairment whenever events and circumstances indicate that a decline in the recoverability of their carrying value may have occurred. The Company estimates the expected undiscounted future cash flows of its proved oil and natural gas properties and then compares such amount to the carrying amount of the proved oil and natural gas properties to determine if the carrying amount is recoverable. If the carrying amount exceeds the estimated undiscounted future cash flows, the Company will adjust the carrying amount of the proved oil and natural gas properties to fair value. The factors used to determine fair value are subject to management’s judgment and expertise and include, but are not limited to, recent sales prices of comparable properties, the present value of future cash flows net of estimated operating and development costs using estimates of proved reserves, future commodity pricing, future production estimates, anticipated capital expenditures and various discount rates commensurate with the risk and current market conditions associated with realizing the expected cash flows projected. These assumptions represent Level 3 inputs, as further discussed under Note 6 — Fair Value Measurements. For the year ended, December 31, 2017, the Company did not record impairment of proved oil and gas properties. As of December 31, 2016, the Company sold certain proved oil and natural gas properties and other midstream properties (see Note 9 – Acquisitions and Divestitures). For the year ended December 31, 2016, the Company recorded an impairment charge of $3.6 million, of which $2.4 million was included in its midstream services segment and $1.1 million was included in its exploration and production segment, to adjust the carrying amount of these assets, net of the associated ARO liabilities, to their estimated fair value. For the year ended December 31, 2015, the Company had certain proved oil and natural gas properties held for sale (see Note 9 – Acquisitions and Divestitures). The Company recorded an impairment loss of $9.4 million, which was included in earnings in its exploration and production segment for the year ended December 31, 2015, to adjust the carrying amount of these assets, net of the associated ARO liabilities, of $25.9 million to their estimated fair value of $16.5 million. The fair value was determined based on the expected sales price, less costs to sell. In addition, as a result of expiring leases and periodic assessments of unproved properties, the Company recorded non-cash impairment charges on its unproved oil and gas properties of $6.9 million, $1.1 million, and $36.6 million for the years ended December 31, 2017, 2016 and 2015, 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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