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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, Cost | $ 19,303,389 | $ 16,502,620 |
Property, plant and equipment, Net | 9,969,743 | 8,432,133 | [1]
Exploration and Production |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, Cost | 19,096,323 | 16,309,149 |
Property, plant and equipment, Net | 9,875,727 | 8,329,514 |
Corporate and other |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, Cost | 207,066 | 193,471 |
Property, plant and equipment, Net | 94,016 | 102,619 |
Mineral Rights |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, Cost | 508,526 | 512,025 |
Property, plant and equipment, Net | 121,163 | 144,912 |
Administrative Assets and Support Equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, Net | $ 24,698 | $ 27,915 |
[1] | Reclassified to conform with current presentation (see Note E)

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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