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Property, Plant and Equipment Assets Amortized by Units of Production (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Property, Plant and Equipment [Line Items] |  |
Unproved Oil and Gas Property, Successful Effort Method | $ 1,116,282 | $ 1,421,083
Property, Plant and Equipment, Gross | 13,771,388 | 13,794,907
Assets amortized by units of production [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Unproved Oil and Gas Property, Successful Effort Method | 1,116,282 | 1,421,083
Coal Properties And Surface Lands | 195,354 | 258,099
Mine development | 7,771 | 7,930
Property Subject to or Available for Operating Lease, Gross | 36,788 | 44,805
Prepaid Royalties | 16,270 | 21,544
Advances for Gas Exploration, Development and Production Amount | 13,762 | 19,745
Property, Plant and Equipment, Gross | 1,405,920 | 1,797,880
Property, Plant and Equipment, Other, Gross | $ 19,693 | $ 24,674

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- Definition Discloses the period end balance sheet amount of advances for gas exploration, development and production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 835 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51666951&loc=d3e70057-109498 + Details
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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 before accumulated depreciation of physical assets used in the normal conduct of business to produce goods and services subject to or available for lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453916&loc=d3e41457-112716 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Oil and Gas properties with unproved reserves under the successful effort method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61926-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -Glossary Unproved Properties -URI http://asc.fasb.org/extlink&oid=6527831 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=56951519&loc=d3e64746-109465 + Details
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