| **Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands** | 3 Months Ended |
|-----------------------------------------------------------------------------------------|----------------|
||
| **Revenues:**                                                                           |           |   |
| Crude oil, natural gas and NGLs sales                                                   | $ 813,284      | $ 882,378 |
| Commodity price risk management gain (loss), net                                        | 144,132        | (568,055) |
| Other income                                                                            | 252            | 2,125 |
| Total revenues                                                                          | 957,668        | 316,448 |
| **Costs, expenses and other:**                                                          |           |   |
| Lease operating expense                                                                 | 73,259         | 54,156 |
| Production taxes                                                                        | 55,747         | 62,916 |
| Transportation, gathering and processing expense                                        | 32,505         | 27,971 |
| Exploration, geologic and geophysical expense                                           | 534            | 253 |
| General and administrative expense                                                      | 41,487         | 34,107 |
| Depreciation, depletion and amortization                                                | 207,187        | 151,055 |
| Accretion of asset retirement obligations                                               | 3,714          | 2,987 |
| Impairment of properties and equipment                                                  | 1,373          | 943 |
| Loss (gain) on sale of properties and equipment                                         | 155            | (125) |
| Total cost, expenses and other                                                          | 415,961        | 334,263 |
| Income (loss) from operations                                                           | 541,707        | (17,815) |
| Interest expense                                                                        | (14,705)       | (12,945) |
| Income (loss) before income taxes                                                       | 527,002        | (30,760) |
| Income tax (expense) benefit                                                            | (112,870)      | (1,200) |
| Net income (loss)                                                                       | $ 414,132      | $ (31,960) |
| **Earnings per share:**                                                                 |           |   |
| Basic                                                                                   | $ 4.69         | $ (0.33) |
| Diluted                                                                                 | $ 4.64         | $ (0.33) |
| **Weighted-average common shares outstanding**                                          |           |   |
| Basic                                                                                   | 88,357         | 96,279 |
| Diluted                                                                                 | 89,228         | 96,279 |

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| - Definition
Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.
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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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Total costs of sales and operating expenses for the period.
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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.
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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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| - Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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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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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.
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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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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.
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| - Definition
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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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
The net result for the period of deducting operating expenses from operating revenues.
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The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.
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| - Definition
A tax assessed on oil and gas production.
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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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| - Definition
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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