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Property, Plant and Equipment (Tables) | 3 Months Ended
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Mar. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment |
| March 31, 2017 |  | December 31, 2016
E&P Property, Plant and Equipment |  |  |
Intangible drilling cost | $ | 3,465,645 |  |  | $ | 3,583,565 |
Proved gas properties | 1,982,134 |  |  | 2,016,916 |
Unproved gas properties | 1,045,437 |  |  | 1,116,282 |
Gas gathering equipment | 1,127,614 |  |  | 1,138,299 |
Gas wells and related equipment | 763,248 |  |  | 791,996 |
Other gas assets | 189,481 |  |  | 190,406 |
Gas advance royalties | 13,186 |  |  | 13,762 |
Total E&P Property, Plant and Equipment | $ | 8,586,745 |  |  | $ | 8,851,226 |
Less: Accumulated Depreciation, Depletion and Amortization | 3,126,778 |  |  | 3,106,296 |
Total E&P Property, Plant and Equipment - Net | $ | 5,459,967 |  |  | $ | 5,744,930 |
PA Mining Operations Property, Plant and Equipment |  |  |
Coal and other plant and equipment | $ | 2,318,308 |  |  | $ | 2,307,668 |
Coal properties and surface lands | 458,976 |  |  | 458,398 |
Airshafts | 372,656 |  |  | 371,752 |
Mine development | 326,152 |  |  | 326,152 |
Coal advance mining royalties | 16,108 |  |  | 16,224 |
Leased coal lands | 26,556 |  |  | 26,566 |
Total PA Mining Operations and Other Property, Plant and Equipment | $ | 3,518,756 |  |  | $ | 3,506,760 |
Less: Accumulated Depreciation, Depletion and Amortization | 1,810,108 |  |  | 1,768,712 |
Total PA Mining Operations and Other Property, Plant and Equipment - Net | $ | 1,708,648 |  |  | $ | 1,738,048 |
Other Property, Plant and Equipment |  |  |
Coal and other plant and equipment | 531,692 |  |  | 532,919 |
Coal properties and surface lands | 481,037 |  |  | 481,126 |
Airshafts | 10,002 |  |  | 10,003 |
Mine development | 17,988 |  |  | 17,988 |
Coal advance mining royalties | 311,205 |  |  | 310,530 |
Leased coal lands | 60,836 |  |  | 60,836 |
Total Other Property, Plant and Equipment | $ | 1,412,760 |  |  | $ | 1,413,402 |
Less: Accumulated Depreciation, Depletion and Amortization | 758,456 |  |  | 755,941 |
Total Other Property, Plant and Equipment - Net | $ | 654,304 |  |  | $ | 657,461 |
Total Company Property, Plant and Equipment - Continuing Operations | $ | 13,518,261 |  |  | $ | 13,771,388 |
Less - Total Company Accumulated Depreciation, Depletion and Amortization | 5,695,342 |  |  | 5,630,949 |
Total Company Property, Plant and Equipment - Held for Sale - Net | 163,622 |  |  | — |
Total Property, Plant and Equipment of Continuing Operations - Net | $ | 7,986,541 |  |  | $ | 8,140,439 |

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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 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 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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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