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Property, Plant and Equipment PROPERTY PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Impairment of Oil and Gas Properties | $ 0 | $ 828,905 | $ 0
Proved Oil and Gas Property, Successful Effort Method | 2,016,916 | 1,922,602 |
Drilling Cost | 3,583,565 | 3,452,989 |
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 |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 5,630,949 | 5,062,201 |
Total Property, Plant and Equipment-Net | 8,140,439 | 9,669,377 |
Property, Plant, and Equipment, Owned, Net | 8,140,439 | 8,732,706 |
Gas Segment [Member] |  |  |
Proved Oil and Gas Property, Successful Effort Method |  | 1,922,602 |
Drilling Cost | 3,583,565 | 3,452,989 |
Unproved Oil and Gas Property, Successful Effort Method |  | 1,421,083 |
Gas Gathering Systems Net | 1,138,299 | 1,147,173 |
Gas wells and related equipment | 791,996 | 785,744 |
Other gas assets | 190,406 | 125,691 |
Advances for Gas Exploration, Development and Production Amount | 13,762 | 19,745 |
Property, Plant and Equipment, Gross | 8,851,226 | 8,875,027 |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 3,106,296 | 2,695,674 |
Total Property, Plant and Equipment-Net | 5,744,930 | 6,179,353 |
PA Operations [Member] |  |  |
Coal and other plant and equipment | 2,307,668 | 2,284,103 |
Coal Properties And Surface Lands | 458,398 | 456,044 |
Property, Plant and Equipment, Other, Gross | 371,752 | 351,870 |
Mine development | 326,152 | 326,225 |
Prepaid Royalties | 16,224 | 16,263 |
Property Subject to or Available for Operating Lease, Gross | 26,566 | 26,402 |
Property, Plant and Equipment, Gross | 3,506,760 | 3,460,907 |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 1,768,712 | 1,603,642 |
Total Property, Plant and Equipment-Net | 1,738,048 | 1,857,265 |
Other Segments [Member] |  |  |
Coal and other plant and equipment | 532,919 | 569,333 |
Coal Properties And Surface Lands | 481,126 | 484,348 |
Property, Plant and Equipment, Other, Gross | 10,003 | 10,002 |
Mine development | 17,988 | 18,073 |
Prepaid Royalties | 310,530 | 312,452 |
Property Subject to or Available for Operating Lease, Gross | 60,836 | 64,765 |
Property, Plant and Equipment, Gross | 1,413,402 | 1,458,973 |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 755,941 | 762,885 |
Total Property, Plant and Equipment-Net | 657,461 | $ 696,088 |
Proved Developed [Member] |  |  |
Impairment of Oil and Gas Properties | 824,742 |  |
proved undeveloped [Member] |  |  |
Impairment of Oil and Gas Properties | $ 4,163 |  |

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