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Reconciliation of Segment Information, Revenue and Other Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue From External Customers |  |  |  |  |  |  |  |  | $ 1,980,592 | $ 2,081,873 | $ 2,930,172
Gain (Loss) on Hedging Activity |  |  |  |  |  |  |  |  | (141,021) | 392,942 | 23,193
Earnings Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | (525,955) | (475,705) | 180,151
Other Income |  |  |  |  |  |  |  |  | 167,306 | 144,351 | 207,460
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  | 19,498 | 74,173 | 43,198
Sales | $ 390,398 | $ 688,590 | $ 602,772 | $ 235,251 | $ 478,864 | $ 631,979 | $ 503,825 | $ 715,740 | 2,026,375 | 2,693,339 | 3,204,023
Total Reportable Business Segments |  |  |  |  |  |  |  |  |  |  |
Earnings Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | (248,132) | (273,863) | 620,682
Gas Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Hedging Activity |  |  |  |  |  |  |  |  | (141,021) | 392,942 | 23,193
Earnings Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | (378,840) | (678,857) | 189,714
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | (85,923) | 66,713 | (119,473)
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Hedging Activity |  |  |  |  |  |  |  |  | 0 | 0 | 0
Earnings Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | (277,399) | (200,304) | (438,073)
Excludes Gas Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |
Interest Income (Expense), Net and Other Non-operating Activity |  |  |  |  |  |  |  |  | (191,476) | (199,266) | (223,333)
Fees for Disposing Non-core Assets |  |  |  |  |  |  |  |  | (424) | (1,538) | 2,458
Corporate Adjustments And Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) Estimates on Extinguishment of Debt |  |  |  |  |  |  |  |  | 0 | (67,751) | (95,267)
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Hedging Activity |  |  |  |  |  |  |  |  | 0 | 0 | 0
Earnings Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | (424) | (1,538) | (2,458)
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue From External Customers |  |  |  |  |  |  |  |  | 1,799,336 | 1,822,452 | 2,713,833
Asia [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue From External Customers |  |  |  |  |  |  |  |  | 109,312 | 106,954 | 66,912
Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue From External Customers |  |  |  |  |  |  |  |  | 40,704 | 112,844 | 121,909
South America [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue From External Customers |  |  |  |  |  |  |  |  | 25,406 | 28,060 | 19,013
CANADA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue From External Customers |  |  |  |  |  |  |  |  | $ 5,834 | $ 11,563 | $ 8,505

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