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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |
Impairment of Oil and Gas Properties | $ 137,865 | $ 0 |
Unproven gas properties | 1,045,437 |  | $ 1,116,282
Drilling Cost | 3,465,645 |  | 3,583,565
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
Proven gas properties | 1,982,134 |  | 2,016,916
Coal and other plant and equipment | 2,318,308 |  | 2,307,668
Coal Lands and or Surface Rights | 458,976 |  | 458,398
Property, Plant and Equipment, Other, Gross | 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
Property, Plant and Equipment | 13,518,261 |  | 13,771,388
Less Accumulated depreciation, depletion and amortization | 5,695,342 |  | 5,630,949
Total Property, Plant and Equipment-Net | 7,986,541 |  | 8,140,439
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 163,622 |  | 0
Property, Plant, and Equipment, Owned, Net | 7,986,541 |  | 8,140,439
Gas Segment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | 8,586,745 |  | 8,851,226
Less Accumulated depreciation, depletion and amortization | 3,126,778 |  | 3,106,296
Total Property, Plant and Equipment-Net | 5,459,967 |  | 5,744,930
PA Operations [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | 3,518,756 |  | 3,506,760
Less Accumulated depreciation, depletion and amortization | 1,810,108 |  | 1,768,712
Total Property, Plant and Equipment-Net | 1,708,648 |  | 1,738,048
Other Segments [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Coal and other plant and equipment | 531,692 |  | 532,919
Coal Lands and or Surface Rights | 481,037 |  | 481,126
Property, Plant and Equipment, Other, Gross | 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
Property, Plant and Equipment | 1,412,760 |  | 1,413,402
Less Accumulated depreciation, depletion and amortization | 758,456 |  | 755,941
Total Property, Plant and Equipment-Net | $ 654,304 |  | $ 657,461

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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370743&loc=d3e66150-109466 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition Amount of asset related to consideration paid in advance for royalties that provide economic benefits within a future period of one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=51662447&loc=d3e5879-108316 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Assets -URI http://asc.fasb.org/extlink&oid=6509628 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6787-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section 05 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51662447&loc=d3e5865-108316 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (g)(5) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + 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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