Property, Plant and Equipment

3 Months Ended

Mar. 31, 2018

Property, Plant and Equipment [Abstract]

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.