| **Consolidated Statements of Cash Flows - USD ($) $ in Thousands**                                                           | 3 Months Ended |
|------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| Net income (loss)                                                                                                            | $ (13,139)     | $ 46,146 |
| Net income (loss)                                                                                                            | (13,139)       | 46,146 |
| **Adjustments to net income (loss) to reconcile to net cash provided by operating activities:**                              |           |   |
| Net change in fair value of unsettled derivatives                                                                            | 21,202         | (80,153) |
| Depreciation, depletion, and amortization                                                                                    | 126,788        | 109,316 |
| Impairment of properties and equipment                                                                                       | 33,188         | 2,193 |
| Accretion of asset retirement obligations                                                                                    | 1,288          | 1,768 |
| Non-cash stock-based compensation                                                                                            | 5,261          | 4,454 |
| (Gain) loss on sale of properties and equipment                                                                              | 1,432          | (160) |
| Amortization of debt discount and issuance costs                                                                             | 3,246          | 3,184 |
| Deferred income taxes                                                                                                        | (4,809)        | 26,280 |
| Other                                                                                                                        | 515            | 722 |
| Changes in assets and liabilities                                                                                            | 30,177         | 25,750 |
| Net cash from operating activities                                                                                           | 205,149        | 139,500 |
| **Cash flows from investing activities:**                                                                                    |           |   |
| Capital expenditures for development of crude oil and natural gas properties                                                 | (196,917)      | (129,826) |
| Capital expenditures for other properties and equipment                                                                      | (1,066)        | (821) |
| Acquisition of crude oil and natural gas properties, including settlement adjustments                                        | (180,825)      | 6,181 |
| Proceeds from sale of properties and equipment                                                                               | 20             | 737 |
| Proceeds from divestiture                                                                                                    | 39,023         | 0 |
| Restricted cash                                                                                                              | 1,249          | 0 |
| Purchases of short-term investments                                                                                          | 0              | (49,890) |
| Net cash from investing activities                                                                                           | (338,516)      | (173,619) |
| **Cash flows from financing activities:**                                                                                    |           |   |
| Proceeds from revolving credit facility                                                                                      | 35,000         | 0 |
| Repayment of revolving credit facility                                                                                       | (35,000)       | 0 |
| Purchase of treasury shares                                                                                                  | (2,255)        | (2,017) |
| Other                                                                                                                        | (379)          | (340) |
| Net cash from financing activities                                                                                           | (2,634)        | (2,357) |
| Net change in cash, cash equivalents, and restricted cash                                                                    | (136,001)      | (36,476) |
| Cash, cash equivalents, and restricted cash, beginning of period                                                             | 189,925        | 244,100 |
| Cash, cash equivalents, and restricted cash, end of period                                                                   | 53,924         | 207,624 |
| **Cash payments (receipts) for:**                                                                                            |           |   |
| Interest, net of capitalized interest                                                                                        | 12,343         | 13,224 |
| Income taxes                                                                                                                 | 193            | (39) |
| **Non-cash investing and financing activities:**                                                                             |           |   |
| Change in accounts payable related to purchases of properties and equipment                                                  | 51,093         | 69,604 |
| Change in asset retirement obligation, with a corresponding change to crude oil and natural gas properties, net of disposals | 5,354          | 1,233 |
| Purchase of properties and equipment under capital leases                                                                    | $ 348          | $ 1,190 |

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.
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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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Future cash outflow to pay for purchases of fixed assets that have occurred.
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The increase during the period in capital lease obligations due to entering into new capital leases.
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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.
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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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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 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 amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.
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The increase (decrease) during the reporting period in the carrying amount of asset retirement obligations.
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The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.
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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.
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Amount of cash paid, after deduction of cash paid for capitalized interest, for interest. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.
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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
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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 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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Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example,  cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).
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The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use.
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The cash outflow to purchase long lived physical asset use for the normal oil and gas operations and not intended for resale.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are 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.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas).
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow (outflow) from financing activities classified as other.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.
+ References
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| - References
No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.
+ References
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