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Segment Information - Reconciliation of Segment Information, Total Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
ASSETS |  |  |
Segment Assets for Total Reportable Business Segments: | $ 9,146,697 | $ 8,592,170 | $ 8,207,758
Items Excluded from Segment Assets: |  |  |
Recoverable Income Taxes | 113,592 | 149,481 |
Total Consolidated Assets | 9,146,697 | $ 8,592,170 | 8,207,758
Intersegment Eliminations |  |  |
ASSETS |  |  |
Segment Assets for Total Reportable Business Segments: | (3,041) |  | (11,166)
Items Excluded from Segment Assets: |  |  |
Total Consolidated Assets | (3,041) |  | (11,166)
Segment Reconciling Items |  |  |
Items Excluded from Segment Assets: |  |  |
Cash and Cash Equivalents | 32,611 |  | 54,846
Recoverable Income Taxes | 113,592 |  | 27,780
Assets Held for Sale | 0 |  | 250,746
E&P | Operating Segments |  |  |
ASSETS |  |  |
Segment Assets for Total Reportable Business Segments: | 6,887,043 |  | 6,055,545
Items Excluded from Segment Assets: |  |  |
Total Consolidated Assets | 6,887,043 |  | 6,055,545
Midstream | Operating Segments |  |  |
ASSETS |  |  |
Segment Assets for Total Reportable Business Segments: | 2,116,492 |  | 1,830,007
Items Excluded from Segment Assets: |  |  |
Total Consolidated Assets | $ 2,116,492 |  | $ 1,830,007

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