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Property, Plant and Equipment
6 Months Ended
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, 2018December 31, 2017
Oil and natural gas properties 
Proved$1,145,667 $1,056,806 
Unproved 87,268 100,884 
Total oil and natural gas properties1,232,935 1,157,690 
Less accumulated depreciation, depletion and impairment(515,822)(460,431)
Net oil and natural gas properties capitalized costs717,113 697,259 
Land 4,500 4,500 
Electrical infrastructure131,010 131,010 
Other non-oil and natural gas equipment19,778 26,809 
Buildings and structures79,548 79,548 
Total234,836 241,867 
Less accumulated depreciation and amortization(20,933)(15,886)
Other property, plant and equipment, net213,903 225,981 
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.