| **Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands** | 3 Months Ended | 6 Months Ended |
|-----------------------------------------------------------------------------------------|----------------|----------------|
||
| **Revenues:**                                                                           |           |           |   |   |
| Crude oil, natural gas and NGL sales                                                    | $ 110,841      | $ 96,928       | $ 186,208 | $ 171,037 |
| Sales from natural gas marketing                                                        | 1,879          | 2,523          | 4,050 | 5,756 |
| Commodity price risk management gain (loss), net                                        | (92,801)       | (49,041)       | (81,745) | 17,621 |
| Well operations, pipeline income and other                                              | 178            | 550            | 2,415 | 1,178 |
| Total revenues                                                                          | 20,097         | 50,960         | 110,928 | 195,592 |
| **Costs, expenses and other:**                                                          |           |           |   |   |
| Production costs                                                                        | 13,675         | 12,639         | 29,005 | 28,924 |
| Production taxes                                                                        | 6,043          | 3,837          | 10,114 | 7,730 |
| Transportation, gathering and processing expenses                                       | 4,465          | 1,308          | 8,506 | 2,646 |
| Cost of natural gas marketing                                                           | 2,125          | 2,836          | 4,703 | 6,094 |
| Exploration expense                                                                     | 237            | 275            | 447 | 560 |
| Impairment of crude oil and natural gas properties                                      | 4,170          | 4,404          | 5,171 | 7,176 |
| General and administrative expense                                                      | 23,579         | 20,728         | 46,358 | 41,773 |
| Depreciation, depletion and amortization                                                | 107,014        | 70,106         | 204,402 | 125,926 |
| Allowance for uncollectible notes receivable                                            | 0              | 0              | 44,738 | 0 |
| Accretion of asset retirement obligation                                                | 1,811          | 1,588          | 3,623 | 3,148 |
| (Gain) loss on sale of properties and equipment                                         | 260            | (207)          | 176 | (228) |
| Total cost, expenses and other                                                          | 163,379        | 117,514        | 357,243 | 223,749 |
| Income (loss) from operations                                                           | (143,282)      | (66,554)       | (246,315) | (28,157) |
| Interest expense                                                                        | (10,672)       | (11,567)       | (22,566) | (23,292) |
| Interest income                                                                         | 177            | 1,135          | 1,735 | 2,248 |
| Income (loss) before income taxes                                                       | (153,777)      | (76,986)       | (267,146) | (49,201) |
| Provision for income taxes                                                              | 58,327         | 30,116         | 100,166 | 19,393 |
| Net income (loss)                                                                       | $ (95,450)     | $ (46,870)     | $ (166,980) | $ (29,808) |
| **Earnings per share:**                                                                 |           |           |   |   |
| Basic                                                                                   | $ (2.04)       | $ (1.17)       | $ (3.78) | $ (0.78) |
| Diluted                                                                                 | $ (2.04)       | $ (1.17)       | $ (3.78) | $ (0.78) |
| **Weighted-average common shares outstanding**                                          |           |           |   |   |
| Basic                                                                                   | 46,742         | 40,035         | 44,175 | 38,202 |
| Diluted                                                                                 | 46,742         | 40,035         | 44,175 | 38,202 |

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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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Cost of oil and gas purchased during the reporting period.
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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 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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| - 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 proven and unproven oil and gas properties.
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Cost incurred related to the gas activities, such as transportation, marketing and processing crude oil, natural gas and refined petroleum products.
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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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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.
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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 not separately disclosed.
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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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Revenue from the sale of oil and gas during the period.
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The net result for the period of deducting operating expenses from operating revenues.
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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.
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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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| - Definition
A tax assessed on oil and gas production.
+ References
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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.
+ 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
Revenue from sale of oil and gas purchased from other sources.
+ 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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| - Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.
+ References
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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.
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| - References
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