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Reconciliation of Segment Information, Income (Loss) From Continuing Operations Before Income Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Total Segment Income (Loss) Before Income Taxes for reportable business segments | $ 30,292 | $ 179,765 | $ 789,532 | $ 41,337
Other (Expense) Income | (575) | (5,475) | 5,917 | (9,550)
Gain on Certain Asset Sales | 3,280 | 134,581 | 14,622 | 138,577
(Loss) Gain on Debt Extinguishment | (23,413) | (36) | (39,048) | 786
Impairment of Other Intangible Assets | (18,650) | 0 | (18,650) | 0
Income From Continuing Operations Before Income Tax | 30,292 | 179,765 | 789,532 | 41,337
Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Total Segment Income (Loss) Before Income Taxes for reportable business segments | 69,920 | 50,695 | 205,264 | (88,476)
Income From Continuing Operations Before Income Tax | 69,920 | 50,695 | 205,264 | (88,476)
Corporate, Non-Segment [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Total Segment Income (Loss) Before Income Taxes for reportable business segments | (39,628) | 129,070 | 584,268 | 129,813
Other (Expense) Income | (575) | (5,475) | 5,917 | (9,550)
Gain on Certain Asset Sales | 3,010 | 134,581 | 12,386 | 138,577
Gain on Previously Held Equity Interest | 0 | 0 | 623,663 | 0
(Loss) Gain on Debt Extinguishment | (23,413) | (36) | (39,048) | 786
Impairment of Other Intangible Assets | (18,650) | 0 | (18,650) | 0
Income From Continuing Operations Before Income Tax | (39,628) | 129,070 | 584,268 | 129,813
Total E&P [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Total Segment Income (Loss) Before Income Taxes for reportable business segments | 42,125 | 50,695 | 141,935 | (88,476)
Income From Continuing Operations Before Income Tax | 42,125 | 50,695 | 141,935 | (88,476)
Midstream [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Total Segment Income (Loss) Before Income Taxes for reportable business segments | 27,795 | 0 | 63,329 | 0
Income From Continuing Operations Before Income Tax | $ 27,795 | $ 0 | $ 63,329 | $ 0

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