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Segment Information Reconciliation of Earnings Before Income Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Excludes Gas Segment [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
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 |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Gain (Loss) Estimates on Extinguishment of Debt | $ 0 | $ (67,751) | $ (95,267)

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