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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 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
Property, plant and equipment, gross | 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
Land |  |
Oil and natural gas properties |  |
Property, plant and equipment, gross | 4,500 | 4,500
Electrical infrastructure |  |
Oil and natural gas properties |  |
Property, plant and equipment, gross | 131,010 | 131,010
Other non-oil and natural gas equipment |  |
Oil and natural gas properties |  |
Property, plant and equipment, gross | 20,016 | 26,809
Buildings and structures |  |
Oil and natural gas properties |  |
Property, plant and equipment, gross | $ 79,548 | $ 79,548

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- Definition Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 + Details
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- Definition Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -URI http://asc.fasb.org/subtopic&trid=2145654 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 + Details
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