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Property, Plant and Equipment
3 Months Ended
Mar. 31, 2019
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,
2019
December 31, 2018
Oil and natural gas properties
Proved
$1,344,552 $1,269,091 
Unproved
57,363 60,152 
Total oil and natural gas properties
1,401,915 1,329,243 
Less accumulated depreciation, depletion and impairment
(614,972)(580,132)
Net oil and natural gas properties capitalized costs
786,943 749,111 
Land4,400 4,400 
Electrical infrastructure131,176 131,176 
Other non-oil and natural gas equipment13,410 13,458 
Buildings and structures77,148 77,148 
Financing leases1,727 — 
Total 227,861 226,182 
Less accumulated depreciation and amortization
(27,847)(25,344)
Other property, plant and equipment, net
200,014 200,838 
Total property, plant and equipment, net
$986,957 $949,949 
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 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 midstream generator assets were sold during the second quarter of 2018 with no gain or loss recognized on the sale. No significant assets were classified as held for sale at March 31, 2019 or December 31, 2018.