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Property, Plant and Equipment | 6 Months Ended
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Jun. 30, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment consists of the following (in thousands):
| June 30, 2018 |  | December 31, 2017
Oil and natural gas properties |  |  |
Proved | $ | 1,145,667 |  | $ | 1,056,806
Unproved | 87,268 |  | 100,884
Total oil and natural gas properties | 1,232,935 |  | 1,157,690
Less accumulated depreciation, depletion and impairment | (515,822) |  | (460,431)
Net oil and natural gas properties capitalized costs | 717,113 |  | 697,259
Land | 4,500 |  | 4,500
Electrical infrastructure | 131,010 |  | 131,010
Other non-oil and natural gas equipment | 19,778 |  | 26,809
Buildings and structures | 79,548 |  | 79,548
Total | 234,836 |  | 241,867
Less accumulated depreciation and amortization | (20,933) |  | (15,886)
Other property, plant and equipment, net | 213,903 |  | 225,981
Total property, plant and equipment, net | $ | 931,016 |  | $ | 923,240
The Company had approximately $10.6 million in assets classified as held for sale in the other current assets line of the accompanying consolidated balance sheet at December 31, 2017. Approximately $9.3 million of the total at December 31, 2017 was 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 sold during the second quarter of 2018 for approximately $10.4 million, net of transaction fees. The resulting gain of $1.1 million is recorded in other operating expense on the accompanying condensed consolidated statements of operations for the three and six-month periods ended June 30, 2018. Additionally, during the first quarter of 2018, the Company classified its remaining midstream generator assets as held for sale. 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 six-month period ended June 30, 2018. The midstream generator assets were also sold during the second quarter of 2018 with no gain or loss recognized on the sale.

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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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