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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Oil and natural gas properties, using full cost method of accounting |  |  |
Proved | $ 1,269,091 | $ 1,056,806 | $ 840,201
Unproved | 60,152 | 100,884 | 74,937
Total oil and natural gas properties | 1,329,243 | 1,157,690 | 915,138
Less: accumulated depreciation, depletion and impairment | (580,132) | (460,431) | (353,030)
Net oil and natural gas properties capitalized costs | 749,111 | 697,259 | $ 562,108
Property, Plant and Equipment, Net |  |  |
Total | 226,182 | 241,867 |
Less accumulated depreciation and amortization | (25,344) | (15,886) |
Other property, plant and equipment, net | 200,838 | 225,981 |
Total property, plant and equipment, net | 949,949 | 923,240 |
Land |  |  |
Property, Plant and Equipment, Net |  |  |
Total | 4,400 | 4,500 |
Electrical infrastructure |  |  |
Property, Plant and Equipment, Net |  |  |
Total | 131,176 | 131,010 |
Non-oil and natural gas equipment |  |  |
Property, Plant and Equipment, Net |  |  |
Total | 13,458 | 26,809 |
Buildings and structures |  |  |
Property, Plant and Equipment, Net |  |  |
Total | $ 77,148 | $ 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://fasb.org/us-gaap/role/ref/legacyRef -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 The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -URI http://asc.fasb.org/subtopic&trid=2145654 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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