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Property, Plant and Equipment (Tables)
9 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consists of the following (in thousands): 
September 30, 2018December 31, 2017
Oil and natural gas properties
Proved
$1,206,363 $1,056,806 
Unproved
68,737 100,884 
Total oil and natural gas properties
1,275,100 1,157,690 
Less accumulated depreciation, depletion and impairment
(546,769)(460,431)
Net oil and natural gas properties capitalized costs
728,331 697,259 
Land
4,500 4,500 
Electrical infrastructure
131,010 131,010 
Other non-oil and natural gas equipment
19,671 26,809 
Buildings and structures
79,548 79,548 
Total 234,729 241,867 
Less accumulated depreciation and amortization
(23,531)(15,886)
Other property, plant and equipment, net
211,198 225,981 
Total property, plant and equipment, net
$939,529 $923,240