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Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment, Cost |  | $ 20,500,772 | $ 20,924,003
Property, plant and equipment, Net |  | 8,220,031 | 8,316,188
Exploration and Production [Member] |  |  |
Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment, Cost | [1] | 20,329,930 | 20,767,772
Property, plant and equipment, Net | [1],[2] | 8,120,293 | 8,214,740
Corporate and Other [Member] |  |  |
Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment, Cost |  | 170,842 | 156,231
Property, plant and equipment, Net |  | 99,738 | 101,448
Mineral Rights [Member] |  |  |
Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment, Cost |  | 600,423 | 595,138
Property, plant and equipment, Net |  | 198,349 | 188,689
Administrative Assets and Support Equipment [Member] |  |  |
Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment, Net |  | $ 38,670 | $ 48,053
[1] | Includes mineral rights as follows: $600,423 198,349 595,138 188,689
[2] | Includes $38,670 in 2017 and $48,053 in 2016 related to administrative assets and support equipment.

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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://www.xbrl.org/2003/role/presentationRef -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://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 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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://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 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(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: 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 + Details
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