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Segment Information - Reconciliation of Segment Information, (Loss) Earnings Before Income Tax (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 02, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Segment Income Before Income Taxes for Reportable Business Segments |  | $ 192,862 | $ 203,434 | $ 350,137 | $ 992,965
Other (Expense) Income |  | (3,439) | (1,105) | (2,757) | 4,812
Gain on Certain Asset Sales | $ 286 | 3,308 | 134,320 | 610 | 148,942
Loss on Debt Extinguishment |  | 0 | (15,385) | (7,614) | (54,433)
Impairment of Other Intangible Assets |  | 0 | 0 | 0 | (18,650)
Earnings Before Income Tax |  | 192,862 | 203,434 | 350,137 | 992,965
Operating Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Segment Income Before Income Taxes for Reportable Business Segments |  | 192,971 | 85,604 | 351,799 | 290,868
Earnings Before Income Tax |  | 192,971 | 85,604 | 351,799 | 290,868
Corporate, Non-Segment |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Segment Income Before Income Taxes for Reportable Business Segments |  | (109) | 117,830 | (1,662) | 702,097
Other (Expense) Income |  | (3,109) | (1,105) | (1,578) | 4,811
Gain on Certain Asset Sales |  | 3,000 | 134,320 | 7,530 | 146,706
Gain on Previously Held Equity Interest |  | 0 | 0 | 0 | 623,663
Loss on Debt Extinguishment |  | 0 | (15,385) | (7,614) | (54,433)
Impairment of Other Intangible Assets |  | 0 | 0 | 0 | (18,650)
Earnings Before Income Tax |  | (109) | 117,830 | (1,662) | 702,097
Total E&P | Operating Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Segment Income Before Income Taxes for Reportable Business Segments |  | 151,230 | 54,431 | 233,060 | 196,366
Earnings Before Income Tax |  | 151,230 | 54,431 | 233,060 | 196,366
Midstream | Operating Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Segment Income Before Income Taxes for Reportable Business Segments |  | 41,741 | 31,173 | 118,739 | 94,502
Earnings Before Income Tax |  | 41,741 | 31,173 | 118,739 | 94,502
Midstream Acquisition | Midstream | Operating Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Segment Income Before Income Taxes for Reportable Business Segments |  | 41,741 | 31,173 | 118,739 | 94,502
Earnings Before Income Tax |  | $ 41,741 | $ 31,173 | $ 118,739 | $ 94,502

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