| **Subsidiary Guarantor Condensed Consolidating Statement of Operations (Details) - USD ($) $ in Thousands**      | 3 Months Ended | 9 Months Ended |
|------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| Crude oil, natural gas and NGLs sales                                                                            | $ 372,439      | $ 232,733      |   | $ 1,003,597 | $ 636,027 |
| Proceeds from Sale of Short-term Investments                                                                     |           |           |   | 0 | 49,890 |
| Commodity price risk management gain (loss), net                                                                 | (94,394)       | (52,178)       |   | (257,760) | 86,458 |
| Other income                                                                                                     | 2,672          | 2,680          |   | 8,011 | 9,615 |
| Revenues                                                                                                         | 280,717        | 183,235        |   | 753,848 | 732,100 |
| Lease operating expenses                                                                                         | 33,046         | 25,353         |   | 94,942 | 65,170 |
| Production taxes                                                                                                 | 23,984         | 15,516         |   | 66,757 | 42,957 |
| Transportation, gathering and processing expenses                                                                | 9,234          | 9,794          |   | 25,511 | 22,184 |
| Exploration, geologic and geophysical expense                                                                    | 1,032          | 41,908         |   | 4,553 | 43,895 |
| Impairment of properties and equipment                                                                           | 1,488          | 252,740        |   | 194,230 | 282,499 |
| Goodwill, Impairment Loss                                                                                        | 0              | 75,121         |   | 0 | 75,121 |
| General and administrative expense                                                                               | 48,240         | 29,299         |   | 121,183 | 85,145 |
| Results of Operations, Depreciation, Depletion, Amortization and Accretion                                       | 147,540        | 125,238        |   | 409,952 | 360,567 |
| Accretion of asset retirement obligations                                                                        | 1,200          | 1,472          |   | 3,773 | 4,906 |
| GainLossonSaleOfOilAndGasPropertyFromContinuingOperations                                                        | 2,118          | (62)           |   | 3,199 | (754) |
| Provision for uncollectible note receivable                                                                      | 0              | 0              | $ 44,000 | 0 | (40,203) |
| Other Cost and Expense, Operating                                                                                | 2,711          | 2,947          |   | 8,187 | 10,365 |
| Costs and Expenses                                                                                               | 270,593        | 579,326        |   | 932,287 | 951,852 |
| Operating Income (Loss)                                                                                          | 10,124         | (396,091)      |   | (178,439) | (219,752) |
| Interest Expense                                                                                                 | 17,622         | 19,275         |   | 52,561 | 58,359 |
| Interest income                                                                                                  | 188            | 479            |   | 405 | 1,487 |
| Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (7,310)        | (414,887)      |   | (230,595) | (276,624) |
| Income tax (expense) benefit                                                                                     | 3,876          | 122,350        |   | 53,765 | 71,483 |
| Income (Loss) from Subsidiaries, Net of Tax                                                                      | 0              | 0              |   | 0 | 0 |
| Net Income (Loss) Attributable to Parent                                                                         | (3,434)        | (292,537)      |   | (176,830) | (205,141) |
| Corporate, Non-Segment [Member]                                                                                  |           |           |   |   |   |
| Crude oil, natural gas and NGLs sales                                                                            | 280,866        | 199,565        |   | 757,263 | 561,132 |
| Commodity price risk management gain (loss), net                                                                 | (94,394)       | (52,178)       |   | (257,760) | 86,458 |
| Other income                                                                                                     | 2,300          | 2,628          |   | 7,295 | 9,512 |
| Revenues                                                                                                         | 188,772        | 150,015        |   | 506,798 | 657,102 |
| Lease operating expenses                                                                                         | 23,219         | 18,181         |   | 68,013 | 49,555 |
| Production taxes                                                                                                 | 17,852         | 13,467         |   | 50,122 | 38,000 |
| Transportation, gathering and processing expenses                                                                | 4,520          | 5,970          |   | 11,361 | 16,953 |
| Exploration, geologic and geophysical expense                                                                    | 279            | 216            |   | 887 | 744 |
| Impairment of properties and equipment                                                                           | 98             | 1,148          |   | 191 | 2,282 |
| Goodwill, Impairment Loss                                                                                        |           | 0              |   |   | 0 |
| General and administrative expense                                                                               | 43,886         | 26,207         |   | 108,597 | 76,353 |
| Results of Operations, Depreciation, Depletion, Amortization and Accretion                                       | 97,370         | 106,623        |   | 284,963 | 317,088 |
| Accretion of asset retirement obligations                                                                        | 1,084          | 1,386          |   | 3,460 | 4,660 |
| GainLossonSaleOfOilAndGasPropertyFromContinuingOperations                                                        | (141)          | (62)           |   | 940 | (754) |
| Provision for uncollectible note receivable                                                                      |           |           |   |   | (40,203) |
| Other Cost and Expense, Operating                                                                                | 2,711          | 2,947          |   | 8,187 | 10,365 |
| Costs and Expenses                                                                                               | 190,878        | 176,083        |   | 536,721 | 475,043 |
| Operating Income (Loss)                                                                                          | (2,106)        | (26,068)       |   | (29,923) | 182,059 |
| Interest Expense                                                                                                 | 18,232         | 19,647         |   | 54,244 | 59,044 |
| Interest income                                                                                                  | 188            | 479            |   | 405 | 1,487 |
| Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (20,150)       | (45,236)       |   | (83,762) | 124,502 |
| Income tax (expense) benefit                                                                                     | 5,753          | 30,274         |   | 19,678 | (32,174) |
| Income (Loss) from Subsidiaries, Net of Tax                                                                      | 10,963         | (277,575)      |   | (112,746) | (297,469) |
| Net Income (Loss) Attributable to Parent                                                                         | (3,434)        | (292,537)      |   | (176,830) | (205,141) |
| Reportable Legal Entities [Member]                                                                               |           |           |   |   |   |
| Crude oil, natural gas and NGLs sales                                                                            | 91,573         | 33,168         |   | 246,334 | 74,895 |
| Commodity price risk management gain (loss), net                                                                 | 0              | 0              |   | 0 | 0 |
| Other income                                                                                                     | 372            | 52             |   | 716 | 103 |
| Revenues                                                                                                         | 91,945         | 33,220         |   | 247,050 | 74,998 |
| Lease operating expenses                                                                                         | 9,827          | 7,172          |   | 26,929 | 15,615 |
| Production taxes                                                                                                 | 6,132          | 2,049          |   | 16,635 | 4,957 |
| Transportation, gathering and processing expenses                                                                | 4,714          | 3,824          |   | 14,150 | 5,231 |
| Exploration, geologic and geophysical expense                                                                    | 753            | 41,692         |   | 3,666 | 43,151 |
| Impairment of properties and equipment                                                                           | 1,390          | 251,592        |   | 194,039 | 280,217 |
| Goodwill, Impairment Loss                                                                                        |           | 75,121         |   |   | 75,121 |
| General and administrative expense                                                                               | 4,354          | 3,092          |   | 12,586 | 8,792 |
| Results of Operations, Depreciation, Depletion, Amortization and Accretion                                       | 50,170         | 18,615         |   | 124,989 | 43,479 |
| Accretion of asset retirement obligations                                                                        | 116            | 86             |   | 313 | 246 |
| GainLossonSaleOfOilAndGasPropertyFromContinuingOperations                                                        | 2,259          | 0              |   | 2,259 | 0 |
| Provision for uncollectible note receivable                                                                      |           |           |   |   | 0 |
| Other Cost and Expense, Operating                                                                                | 0              | 0              |   | 0 | 0 |
| Costs and Expenses                                                                                               | 79,715         | 403,243        |   | 395,566 | 476,809 |
| Operating Income (Loss)                                                                                          | 12,230         | (370,023)      |   | (148,516) | (401,811) |
| Interest Expense                                                                                                 | 610            | 372            |   | 1,683 | 685 |
| Interest income                                                                                                  | 0              | 0              |   | 0 | 0 |
| Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 12,840         | (369,651)      |   | (146,833) | (401,126) |
| Income tax (expense) benefit                                                                                     | (1,877)        | 92,076         |   | 34,087 | 103,657 |
| Income (Loss) from Subsidiaries, Net of Tax                                                                      | 0              | 0              |   | 0 | 0 |
| Net Income (Loss) Attributable to Parent                                                                         | 10,963         | (277,575)      |   | (112,746) | (297,469) |
| Consolidation, Eliminations [Member]                                                                             |           |           |   |   |   |
| Crude oil, natural gas and NGLs sales                                                                            | 0              | 0              |   | 0 | 0 |
| Proceeds from Sale of Short-term Investments                                                                     |           |           |   |   | 0 |
| Commodity price risk management gain (loss), net                                                                 | 0              | 0              |   | 0 | 0 |
| Other income                                                                                                     | 0              | 0              |   | 0 | 0 |
| Revenues                                                                                                         | 0              | 0              |   | 0 | 0 |
| Lease operating expenses                                                                                         | 0              | 0              |   | 0 | 0 |
| Production taxes                                                                                                 | 0              | 0              |   | 0 | 0 |
| Transportation, gathering and processing expenses                                                                | 0              | 0              |   | 0 | 0 |
| Exploration, geologic and geophysical expense                                                                    | 0              | 0              |   | 0 | 0 |
| Impairment of properties and equipment                                                                           | 0              | 0              |   | 0 | 0 |
| Goodwill, Impairment Loss                                                                                        |           | 0              |   |   | 0 |
| General and administrative expense                                                                               | 0              | 0              |   | 0 | 0 |
| Results of Operations, Depreciation, Depletion, Amortization and Accretion                                       | 0              | 0              |   | 0 | 0 |
| Accretion of asset retirement obligations                                                                        | 0              | 0              |   | 0 | 0 |
| GainLossonSaleOfOilAndGasPropertyFromContinuingOperations                                                        | 0              | 0              |   | 0 | 0 |
| Provision for uncollectible note receivable                                                                      |           |           |   |   | 0 |
| Other Cost and Expense, Operating                                                                                | 0              | 0              |   | 0 | 0 |
| Costs and Expenses                                                                                               | 0              | 0              |   | 0 | 0 |
| Operating Income (Loss)                                                                                          | 0              | 0              |   | 0 | 0 |
| Interest Expense                                                                                                 | 0              | 0              |   | 0 | 0 |
| Interest income                                                                                                  | 0              | 0              |   | 0 | 0 |
| Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 0              | 0              |   | 0 | 0 |
| Income tax (expense) benefit                                                                                     | 0              | 0              |   | 0 | 0 |
| Income (Loss) from Subsidiaries, Net of Tax                                                                      | (10,963)       | 277,575        |   | 112,746 | 297,469 |
| Net Income (Loss) Attributable to Parent                                                                         | $ (10,963)     | $ 277,575      |   | $ 112,746 | $ 297,469 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Gain (loss) recorded from sale of oil and gas properties, includes the realized gains (losses) on the sale of proved and unproved oil and gas properties, from continuing operations.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.
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| - Definition
Total costs of sales and operating expenses for the period.
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| - Definition
Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.
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| - Definition
The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.
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| - Definition
Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.
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Amount after tax of income (loss) of subsidiary attributable to the parent entity.
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
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Amount of interest income earned from interest bearing assets classified as other.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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The net result for the period of deducting operating expenses from operating revenues.
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The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.
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The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.
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The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.
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A tax assessed on oil and gas production.
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| - Definition
Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.
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Depreciation, depletion, amortization, and accretion related to oil and gas producing activities.
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No definition available.
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Costs related to the impairment of oil and gas properties.
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Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense.
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Total revenues from oil and gas producing activities.
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Includes the cost to prepare and move liquid hydrocarbons and natural gas to their points of sale.
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| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
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