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Segment Information - Reconciliation of Segment Information, Total Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
ASSETS |  |  |
Segment Assets for Total Reportable Business Segments: | $ 9,286,258 | $ 8,592,170 | $ 8,209,036
Items Excluded from Segment Assets: |  |  |
Recoverable Income Taxes | 11,184 | 149,481 |
Total Consolidated Assets | 9,286,258 | $ 8,592,170 | 8,209,036
Intersegment Eliminations |  |  |
ASSETS |  |  |
Segment Assets for Total Reportable Business Segments: | 3,735 |  | (12,926)
Items Excluded from Segment Assets: |  |  |
Total Consolidated Assets | 3,735 |  | (12,926)
Segment Reconciling Items |  |  |
Items Excluded from Segment Assets: |  |  |
Cash and Cash Equivalents | 5,484 |  | 42,672
Recoverable Income Taxes | 11,184 |  | 40,024
E&P | Operating Segments |  |  |
ASSETS |  |  |
Segment Assets for Total Reportable Business Segments: | 7,087,782 |  | 6,256,132
Items Excluded from Segment Assets: |  |  |
Total Consolidated Assets | 7,087,782 |  | 6,256,132
Midstream | Operating Segments |  |  |
ASSETS |  |  |
Segment Assets for Total Reportable Business Segments: | 2,178,073 |  | 1,883,134
Items Excluded from Segment Assets: |  |  |
Total Consolidated Assets | $ 2,178,073 |  | $ 1,883,134

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