XML 65 R42.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Property, Plant and Equipment (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment |
| December 31,
E&P Property, Plant and Equipment | 2016 |  | 2015
Intangible drilling cost | $ | 3,583,565 |  |  | $ | 3,452,989 |
Proved gas properties | 2,016,916 |  |  | 1,922,602 |
Unproved gas properties | 1,116,282 |  |  | 1,421,083 |
Gas gathering equipment | 1,138,299 |  |  | 1,147,173 |
Gas wells and related equipment | 791,996 |  |  | 785,744 |
Other gas assets | 190,406 |  |  | 125,691 |
Gas advance royalties | 13,762 |  |  | 19,745 |
Total E&P Property, Plant and Equipment | $ | 8,851,226 |  |  | $ | 8,875,027 |
Less: Accumulated Depreciation, Depletion and Amortization | 3,106,296 |  |  | 2,695,674 |
Total E&P Property, Plant and Equipment - Net | $ | 5,744,930 |  |  | $ | 6,179,353 |
PA Mining Operations Property, Plant and Equipment |  |  |
Coal and other plant and equipment | $ | 2,307,668 |  |  | $ | 2,284,103 |
Coal properties and surface lands | 458,398 |  |  | 456,044 |
Airshafts | 371,752 |  |  | 351,870 |
Mine development | 326,152 |  |  | 326,225 |
Coal advance mining royalties | 16,224 |  |  | 16,263 |
Leased coal lands | 26,566 |  |  | 26,402 |
Total PA Mining Operations Property, Plant and Equipment | $ | 3,506,760 |  |  | $ | 3,460,907 |
Less: Accumulated Depreciation, Depletion and Amortization | 1,768,712 |  |  | 1,603,642 |
Total PA Mining Operations Property, Plant and Equipment - Net | $ | 1,738,048 |  |  | $ | 1,857,265 |
Other Property, Plant and Equipment |  |  |
Coal and other plant and equipment | $ | 532,919 |  |  | $ | 569,333 |
Coal properties and surface lands | 481,126 |  |  | 484,348 |
Airshafts | 10,003 |  |  | 10,002 |
Mine development | 17,988 |  |  | 18,073 |
Coal advance mining royalties | 310,530 |  |  | 312,452 |
Leased coal lands | 60,836 |  |  | 64,765 |
Total Other Property, Plant and Equipment | $ | 1,413,402 |  |  | $ | 1,458,973 |
Less: Accumulated Depreciation, Depletion and Amortization | 755,941 |  |  | 762,885 |
Total Other Property, Plant and Equipment - Net | $ | 657,461 |  |  | $ | 696,088 |
Total Company Property, Plant and Equipment | $ | 13,771,388 |  |  | $ | 13,794,907 |
Less - Total Company Accumulated Depreciation, Depletion and Amortization | 5,630,949 |  |  | 5,062,201 |
Total Company Property, Plant and Equipment - Net | $ | 8,140,439 |  |  | $ | 8,732,706 |
Schedule of Amortization Expense Per Unit of Production [Table Text Block] |
| December 31,
| 2016 |  | 2015
Unproved gas properties | $ | 1,116,282 |  |  | $ | 1,421,083 |
Coal properties | 195,354 |  |  | 258,099 |
Leased coal lands | 36,788 |  |  | 44,805 |
Airshafts | 19,693 |  |  | 24,674 |
Coal advance mining royalties | 16,270 |  |  | 21,544 |
Gas advance royalties | 13,762 |  |  | 19,745 |
Mine development | 7,771 |  |  | 7,930 |
Total | $ | 1,405,920 |  |  | $ | 1,797,880 |

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_PropertyPlantAndEquipmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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=50486907&loc=d3e511914-122862 + Details
Name: | us-gaap_ScheduleOfAmortizationExpensePerUnitOfProductionTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration