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Property, Plant and Equipment | 3 Months Ended
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Mar. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment consists of the following (in thousands):
| March 31, 2018 |  | December 31, 2017
Oil and natural gas properties |  |  |
Proved | $ | 1,103,921 |  |  | $ | 1,056,806 |
Unproved | 91,793 |  |  | 100,884 |
Total oil and natural gas properties | 1,195,714 |  |  | 1,157,690 |
Less accumulated depreciation, depletion and impairment | (486,645 | ) |  | (460,431 | )
Net oil and natural gas properties capitalized costs | 709,069 |  |  | 697,259 |
Land | 4,500 |  |  | 4,500 |
Electrical infrastructure | 131,010 |  |  | 131,010 |
Other non-oil and natural gas equipment | 20,016 |  |  | 26,809 |
Buildings and structures | 79,548 |  |  | 79,548 |
Total | 235,074 |  |  | 241,867 |
Less accumulated depreciation and amortization | (18,209 | ) |  | (15,886 | )
Other property, plant and equipment, net | 216,865 |  |  | 225,981 |
Total property, plant and equipment, net | $ | 925,934 |  |  | $ | 923,240 |
The Company has approximately $11.0 million in assets classified as held for sale in the other current assets line of the accompanying consolidated balance sheet at March 31, 2018. Approximately $9.3 million of this total is related to one of the Company’s properties located in downtown Oklahoma City, OK, which was classified as held for sale in the fourth quarter of 2017 and is expected to be sold during the second quarter of 2018. The remaining balance largely consists of the Company’s midstream generator assets. These assets had a carrying value of $5.7 million which exceeded the estimated net realizable value of $1.6 million based on the expected sales prices obtained from third parties. As a result, the Company recorded an impairment of $4.1 million for the three-month period ended March 31, 2018. The Company expects to dispose of these assets within the next year.

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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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