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Segment Information - Reconciliation of Segment Information, (Loss) Earnings Before Income Tax (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 02, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 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 |  | $ 233,485 | $ 30,292 | $ 157,275 | $ 789,532
Other Income (Expense) |  | 99 | (575) | 681 | 5,917
Gain on Certain Asset Sales | $ 286 | 387 | 3,280 | (2,699) | 14,622
Loss on Debt Extinguishment |  | (77) | (23,413) | (7,614) | (39,048)
Impairment of Other Intangible Assets |  | 0 | (18,650) | 0 | (18,650)
Earnings Before Income Tax |  | 233,485 | 30,292 | 157,275 | 789,532
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 |  | 232,674 | 69,920 | 158,828 | 205,264
Earnings Before Income Tax |  | 232,674 | 69,920 | 158,828 | 205,264
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 |  | 811 | (39,628) | (1,553) | 584,268
Other Income (Expense) |  | 501 | (575) | 1,531 | 5,917
Gain on Certain Asset Sales |  | 387 | 3,010 | 4,530 | 12,386
Gain on Previously Held Equity Interest |  | 0 | 0 | 0 | 623,663
Loss on Debt Extinguishment |  | (77) | (23,413) | (7,614) | (39,048)
Impairment of Other Intangible Assets |  | 0 | (18,650) | 0 | (18,650)
Earnings Before Income Tax |  | 811 | (39,628) | (1,553) | 584,268
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 |  | 188,260 | 42,125 | 81,830 | 141,935
Earnings Before Income Tax |  | $ 188,260 | $ 42,125 | $ 81,830 | $ 141,935

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- Definition Amount of gain (loss) on sale or disposal of an equity method investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(7)(c)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(9)(a)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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