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Reconciliation of Segment Information, Total Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
ASSETS |  |  |
Segment assets for total reportable business segments | $ 8,207,758 | $ 6,931,913 | $ 9,025,195
Items excluded from segment assets: |  |  |
Recoverable Income Taxes | 27,780 | 31,523 |
Total Consolidated Assets | 8,207,758 | $ 6,931,913 | 9,025,195
Intersegment Eliminations [Member] |  |  |
ASSETS |  |  |
Segment assets for total reportable business segments | (11,166) |  | 0
Items excluded from segment assets: |  |  |
Total Consolidated Assets | (11,166) |  | 0
Segment Reconciling Items [Member] |  |  |
Items excluded from segment assets: |  |  |
Cash and Cash Equivalents | 54,846 |  | 291,535
Recoverable Income Taxes | 27,780 |  | 112,073
Deferred Income Taxes | 0 |  | 0
Assets Held for Sale | 250,746 |  | 0
Discontinued Operations | 0 |  | 2,426,767
E&P [Member] | Operating Segments [Member] |  |  |
ASSETS |  |  |
Segment assets for total reportable business segments | 6,055,545 |  | 6,194,820
Items excluded from segment assets: |  |  |
Total Consolidated Assets | 6,055,545 |  | 6,194,820
Midstream [Member] | Operating Segments [Member] |  |  |
ASSETS |  |  |
Segment assets for total reportable business segments | 1,830,007 |  | 0
Items excluded from segment assets: |  |  |
Total Consolidated Assets | $ 1,830,007 |  | $ 0

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