| **Consolidated Statements of Cash Flows (Audited) (USD $)**                                                                  | 6 Months Ended |
|------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Cash flows from operating activities:**                                                                                    |           |   |
| Net income (loss)                                                                                                            | $ (19,500,000) | $ 28,106,000 |
| **Adjustments to net income (loss) to reconcile to net cash provided by operating activities:**                              |           |   |
| Unrealized loss (gain) loss on derivatives, net                                                                              | (9,913,000)    | 24,079,000 |
| Depreciation, depletion and amortization                                                                                     | 58,007,000     | 74,262,000 |
| Impairment of crude oil and natural gas properties                                                                           | 47,964,000     | 1,023,000 |
| Accretion of asset retirement obligation                                                                                     | 2,481,000      | 1,644,000 |
| Stock-based compensation                                                                                                     | 6,951,000      | 3,901,000 |
| Excess tax benefits from stock-based compensation                                                                            | 930,000        | 356,000 |
| (Gain) loss on sale of properties and equipment                                                                              | (1,029,000)    | 22,331,000 |
| Amortization of debt discount and issuance costs                                                                             | 3,419,000      | 3,547,000 |
| Deferred income taxes                                                                                                        | (11,075,000)   | 12,330,000 |
| Other                                                                                                                        | (454,000)      | (1,168,000) |
| Changes in assets and liabilities                                                                                            | (56,687,000)   | (9,520,000) |
| Net cash from operating activities                                                                                           | 42,026,000     | 69,695,000 |
| **Cash flows from investing activities:**                                                                                    |           |   |
| Capital expenditures                                                                                                         | (139,462,000)  | (165,157,000) |
| Acquisition of oil and gas properties                                                                                        | 0              | (309,285,000) |
| Proceeds from acquisition adjustments                                                                                        | 7,579,000      | 11,969,000 |
| Proceeds from sale of properties and equipment                                                                               | 173,297,000    | 187,340,000 |
| Other                                                                                                                        | 0              | (17,497,000) |
| Net cash from investing activities                                                                                           | 41,414,000     | (292,630,000) |
| **Cash flows from financing activities:**                                                                                    |           |   |
| Proceeds from revolving credit facility                                                                                      | 227,750,000    | 483,250,000 |
| Payment of revolving credit facility                                                                                         | (267,000,000)  | (425,250,000) |
| Proceeds from sale of common stock, net of issuance costs                                                                    | 0              | 164,050,000 |
| Payment of debt issuance costs                                                                                               | (1,961,000)    | (636,000) |
| Excess tax benefits from stock-based compensation                                                                            | 930,000        | 356,000 |
| Purchase of treasury shares                                                                                                  | (2,404,000)    | (1,117,000) |
| Net cash from financing activities                                                                                           | (42,685,000)   | 220,653,000 |
| Net increase (decrease) in cash and cash equivalents                                                                         | 40,755,000     | (2,282,000) |
| Cash and cash equivalents, beginning of period                                                                               | 2,457,000      | 8,238,000 |
| Cash and cash equivalents, end of period                                                                                     | 43,212,000     | 5,956,000 |
| **Cash payments (receipts) for:**                                                                                            |           |   |
| Interest, net of capitalized interest                                                                                        | 25,787,000     | 17,918,000 |
| Income taxes                                                                                                                 | (57,000)       | 1,468,000 |
| **Non-cash investing activities:**                                                                                           |           |   |
| Change in accounts payable related to purchases of properties and equipment                                                  | (8,695,000)    | (12,927,000) |
| Change in asset retirement obligation, with a corresponding change to natural gas and crude oil properties, net of disposals | 211,000        | 11,934,000 |
| Change in accounts payable related to disposition of properties and equipment                                                | -4680          | 0 |
| Change in accounts receivable affiliates related to disposition of properties and equipment                                  | $ 9,201,000    | $ 0 |

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Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.
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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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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. Excludes cash and cash equivalents within disposal group and discontinued operation.
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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 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 cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.
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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.
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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 expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.
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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 amount of cash paid for interest during the period net of cash paid for interest that is capitalized.
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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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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.
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The noncash (or part noncash) consideration given (for example, liability, equity) in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period.
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| - Definition
The value of the noncash (or part noncash) consideration received in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period.
+ References
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| - Definition
The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.
+ References
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| - Definition
The net cash inflow or outflow associated with the aggregate amount of adjustment to the purchase price of a previous acquisition.
+ References
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| - Definition
The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.
+ References
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| - Definition
The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.
+ 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 from the additional capital contribution to the entity.
+ 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
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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| - 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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