| **Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands** | 3 Months Ended | 6 Months Ended |
|-----------------------------------------------------------------------------------------|----------------|----------------|
||
| **Revenues:**                                                                           |           |           |   |   |
| Crude oil, natural gas and NGLs sales                                                   | $ 338,956      | $ 325,933      | $ 660,055 | $ 631,158 |
| Commodity price risk management gain (loss), net                                        | 47,349         | (116,126)      | (142,725) | (163,366) |
| Other income                                                                            | 4,353          | 2,724          | 7,828 | 5,339 |
| Total revenues                                                                          | 390,658        | 212,531        | 525,158 | 473,131 |
| **Costs, expenses and other:**                                                          |           |           |   |   |
| Lease operating expenses                                                                | 34,328         | 32,260         | 69,549 | 61,896 |
| Production taxes                                                                        | 22,642         | 22,604         | 44,810 | 42,773 |
| Transportation, gathering and processing expenses                                       | 12,208         | 8,964          | 23,632 | 16,277 |
| Exploration, geologic and geophysical expense                                           | 640            | 875            | 3,283 | 3,521 |
| Impairment of properties and equipment                                                  | 28,979         | 159,554        | 36,854 | 192,742 |
| General and administrative expense                                                      | 42,808         | 37,247         | 82,406 | 72,943 |
| Depreciation, depletion and amortization                                                | 168,523        | 135,624        | 319,945 | 262,412 |
| Accretion of asset retirement obligations                                               | 1,563          | 1,285          | 3,147 | 2,573 |
| (Gain) loss on sale of properties and equipment                                         | (33,904)       | (351)          | (34,273) | 1,081 |
| Other expenses                                                                          | 2,836          | 2,708          | 6,390 | 5,476 |
| Total cost, expenses and other                                                          | 280,623        | 400,770        | 555,743 | 661,694 |
| Income (loss) from operations                                                           | 110,035        | (188,239)      | (30,585) | (188,563) |
| Interest expense                                                                        | (18,905)       | (17,410)       | (35,883) | (34,939) |
| Interest income                                                                         | 5              | 69             | 15 | 217 |
| Income (loss) before income taxes                                                       | 91,135         | (205,580)      | (66,453) | (223,285) |
| Income tax (expense) benefit                                                            | (22,587)       | 45,323         | 14,825 | 49,889 |
| Net income (loss)                                                                       | $ 68,548       | $ (160,257)    | $ (51,628) | $ (173,396) |
| **Earnings per share:**                                                                 |           |           |   |   |
| Basic                                                                                   | $ 1.04         | $ (2.43)       | $ (0.78) | $ (2.63) |
| Diluted                                                                                 | $ 1.04         | $ (2.43)       | $ (0.78) | $ (2.63) |
| **Weighted-average common shares outstanding**                                          |           |           |   |   |
| Basic                                                                                   | 65,815         | 66,066         | 65,998 | 66,012 |
| Diluted                                                                                 | 65,926         | 66,066         | 65,998 | 66,012 |

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Total costs of sales and operating expenses for the period.
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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.
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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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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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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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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 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 of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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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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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 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 weighted average number of shares or units and dilutive common stock or unit equivalents outstanding in the calculation of proforma diluted earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering.
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| - Definition
A tax assessed on oil and gas production.
+ References
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| - Definition
Costs related to the impairment of oil and gas properties.
+ References
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| - Definition
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.
+ References
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| - Definition
Total revenues from oil and gas producing activities.
+ References
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| - Definition
Includes the cost to prepare and move liquid hydrocarbons and natural gas to their points of sale.
+ References
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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).
+ References
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| - References
No definition available.
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| - Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
+ References
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| - References
No definition available.
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