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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment consists of the following (in thousands): 

	December 31,
	2017				2016
Oil and natural gas properties
Proved	$	1,056,806			$	840,201
Unproved	100,884				74,937
Total oil and natural gas properties	1,157,690				915,138
Less accumulated depreciation, depletion and impairment	(460,431		)		(353,030		)
Net oil and natural gas properties capitalized costs	697,259				562,108
Land	4,500				5,100
Electrical infrastructure	131,010				130,242
Non-oil and natural gas equipment	26,809				35,768
Buildings and structures	79,548				88,603
Total	241,867				259,713
Less accumulated depreciation and amortization	(15,886		)		(3,889		)
Other property, plant and equipment, net	225,981				255,824
Total property, plant and equipment, net	$	923,240			$	817,932

Capitalized Costs of Unproved Properties Excluded from Amortization

The following table summarizes the costs, by year incurred, related to unproved properties, which were excluded from oil and natural gas properties subject to amortization at December 31, 2017 (in thousands):

					Year Cost Incurred
	Total				2017				2016				2015				2014 and Prior
Property acquisition	$	96,450			$	42,827			$	15,610			$	19,481			$	18,532
Exploration	4,434				1,904				678				1,453				399
Total costs incurred	$	100,884			$	44,731			$	16,288			$	20,934			$	18,931

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- References

No definition available.

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- Definition

Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Tabular disclosure of the capitalized costs of unproved properties and major development projects that are excluded from capitalized costs being amortized. This includes the total costs excluded and, at a minimum, these categories of costs: acquisition costs, exploration costs, development costs in the case of significant development projects, and capitalized interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10(c)(7)(ii))
-URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10(a)(32))
-URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862

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