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Reconciliation of Segment Information, Total Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Assets: |  |  |
Total Assets | $ 9,063,769 | $ 9,183,981 | $ 10,715,874
Total Other Assets | 461,013 | 417,403 |
Items excluded from segment assets: |  |  |
Recoverable Income Taxes | 124,555 | $ 116,851 |
Operating Segments [Member] |  |  |
Assets: |  |  |
Total Assets | 8,029,471 |  | 8,893,127
Corporate and Other [Member] |  |  |
Assets: |  |  |
Total Other Assets | 810,939 |  | 876,286
Gas Segment [Member] |  |  |
Assets: |  |  |
Total Assets | 6,074,299 |  | 6,814,568
Other Segments [Member] |  |  |
Assets: |  |  |
Total Assets | 1,029,724 |  | 1,295,011
Items excluded from segment assets: |  |  |
Cash and Other Investments | 54,630 |  |
Excludes Gas Segment [Member] |  |  |
Items excluded from segment assets: |  |  |
Cash and Other Investments |  |  | 416,854
Intersegment Eliminations [Member] |  |  |
Assets: |  |  |
Total Assets | 4,574 |  | 527,736
Items excluded from segment assets: |  |  |
Cash and Other Investments | 124,555 |  |
Recoverable Income Taxes |  |  | 1,871
Deferred Tax Assets, Net of Valuation Allowance | 44,174 |  | 0
Disposal Group, Including Discontinued Operation, Assets | $ 0 |  | $ 527,736

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