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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2014
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment |
| December 31,
| 2014 |  | 2013
Coal & other plant and equipment | 3,726,514 |  |  | 3,681,051 |
Intangible drilling cost | 2,798,394 |  |  | 1,937,336 |
Proven properties | 1,768,007 |  |  | 1,670,404 |
Unproven properties | 1,540,835 |  |  | 1,463,406 |
Coal properties and surface lands | 1,358,306 |  |  | 1,404,056 |
Gathering equipment | 1,088,238 |  |  | 1,058,008 |
Wells and related equipment | 716,748 |  |  | 688,548 |
Airshafts | 468,924 |  |  | 397,466 |
Leased coal lands | 263,946 |  |  | 393,372 |
Coal advance mining royalties | 386,245 |  |  | 381,348 |
Mine development | 414,501 |  |  | 354,607 |
Other gas assets | 123,539 |  |  | 126,239 |
Gas advance royalties | 20,580 |  |  | 22,668 |
Total Property, Plant and Equipment | 14,674,777 |  |  | 13,578,509 |
Less Accumulated Depreciation, Depletion and Amortization | 4,512,305 |  |  | 4,136,247 |
Total Net Property, Plant and Equipment | $ | 10,162,472 |  |  | $ | 9,442,262 |
Schedule of Amortization Expense Per Unit of Production [Table Text Block] |
|  | December 31,
|  | 2014 |  | 2013
Unproven gas properties |  | $ | 1,540,835 |  |  | $ | 1,463,406 |
Coal properties |  | 477,444 |  |  | 273,242 |
Mine development |  | 11,984 |  |  | 238,356 |
Leased coal lands |  | 50,044 |  |  | 99,506 |
Coal advance mining royalties |  | 52,009 |  |  | 48,043 |
Airshafts |  | 52,194 |  |  | 38,794 |
Gas advance royalties |  | 20,580 |  |  | 22,668 |
Total |  | $ | 2,205,090 |  |  | $ | 2,184,015 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: 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 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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- Definition Tabular disclosure of amortization expense per unit of production for oil and gas enterprises that follow the full cost method of accounting for investments in oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(i)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 7 -Article 4 + Details
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