| **Subsidiary Guarantor Condensed Consolidating Statement of Cash Flows (Details) - USD ($)** | 6 Months Ended |
|----------------------------------------------------------------------------------------------|----------------|
||
| Net cash from operating activities                                                           | $ 263,197,000  | $ 197,798,000 |
| **Cash flows from investing activities:**                                                    |           |   |
| Capital expenditures for development of crude oil and natural gas properties                 | (334,406,000)  | (234,677,000) |
| Capital expenditures for other properties and equipment                                      | (2,299,000)    | (1,030,000) |
| Acquisition of crude oil and natural gas properties, including final settlement adjustments  | 5,372,000      | 0 |
| Proceeds from sale of properties and equipment                                               | 1,293,000      | 4,903,000 |
| Proceeds from Sale of Notes Receivable                                                       | 40,203,000     | 0 |
| Increase (Decrease) in Restricted Cash                                                       | (9,250,000)    | 0 |
| Purchases of short-term investments                                                          | (49,890,000)   | 0 |
| Proceeds from Sale of Short-term Investments                                                 | 49,890,000     | 0 |
| intercompany Transfer Investing Activities                                                   | 0              |   |
| Net cash from investing activities                                                           | (299,087,000)  | (230,804,000) |
| **Cash flows from financing activities:**                                                    |           |   |
| Proceeds from issuance of equity, net of issuance costs                                      | 0              | 296,575,000 |
| Treasury Stock, Value, Acquired, Cost Method                                                 | (5,274,000)    | (4,055,000) |
| Other                                                                                        | (645,000)      | 735,000 |
| Intercompany Transfers Financing Activities                                                  | 0              |   |
| Net cash from financing activities                                                           | (5,919,000)    | 141,255,000 |
| Net change in cash and cash equivalents                                                      | (41,809,000)   | 108,249,000 |
| Cash and cash equivalents, beginning of period                                               | 244,100,000    | 850,000 |
| Cash and cash equivalents, end of period                                                     | 202,291,000    | $ 109,099,000 |
| Consolidation, Eliminations [Member]                                                         |           |   |
| Net cash from operating activities                                                           | 0              |   |
| **Cash flows from investing activities:**                                                    |           |   |
| Capital expenditures for development of crude oil and natural gas properties                 | 0              |   |
| Capital expenditures for other properties and equipment                                      | 0              |   |
| Acquisition of crude oil and natural gas properties, including final settlement adjustments  | 0              |   |
| Proceeds from sale of properties and equipment                                               | 0              |   |
| Proceeds from Sale of Notes Receivable                                                       | 0              |   |
| Increase (Decrease) in Restricted Cash                                                       | 0              |   |
| Purchases of short-term investments                                                          | 0              |   |
| Proceeds from Sale of Short-term Investments                                                 | 0              |   |
| intercompany Transfer Investing Activities                                                   | 109,923,000    |   |
| Net cash from investing activities                                                           | 109,923,000    |   |
| **Cash flows from financing activities:**                                                    |           |   |
| Proceeds from issuance of equity, net of issuance costs                                      | 0              |   |
| Treasury Stock, Value, Acquired, Cost Method                                                 | 0              |   |
| Other                                                                                        | 0              |   |
| Intercompany Transfers Financing Activities                                                  | (109,923,000)  |   |
| Net cash from financing activities                                                           | (109,923,000)  |   |
| Net change in cash and cash equivalents                                                      | 0              |   |
| Cash and cash equivalents, beginning of period                                               | 0              |   |
| Cash and cash equivalents, end of period                                                     | 0              |   |
| Parent Company [Member] | Reportable Legal Entities [Member]                                 |           |   |
| Net cash from operating activities                                                           | 246,128,000    |   |
| **Cash flows from investing activities:**                                                    |           |   |
| Capital expenditures for development of crude oil and natural gas properties                 | (198,954,000)  |   |
| Capital expenditures for other properties and equipment                                      | (1,792,000)    |   |
| Acquisition of crude oil and natural gas properties, including final settlement adjustments  | 0              |   |
| Proceeds from sale of properties and equipment                                               | 1,293,000      |   |
| Proceeds from Sale of Notes Receivable                                                       | 40,203,000     |   |
| Increase (Decrease) in Restricted Cash                                                       | (9,250,000)    |   |
| Purchases of short-term investments                                                          | (49,890,000)   |   |
| Proceeds from Sale of Short-term Investments                                                 | 49,890,000     |   |
| intercompany Transfer Investing Activities                                                   | (109,923,000)  |   |
| Net cash from investing activities                                                           | (278,423,000)  |   |
| **Cash flows from financing activities:**                                                    |           |   |
| Proceeds from issuance of equity, net of issuance costs                                      | 0              |   |
| Treasury Stock, Value, Acquired, Cost Method                                                 | (5,274,000)    |   |
| Other                                                                                        | (627,000)      |   |
| Intercompany Transfers Financing Activities                                                  | 0              |   |
| Net cash from financing activities                                                           | (5,901,000)    |   |
| Net change in cash and cash equivalents                                                      | (38,196,000)   |   |
| Cash and cash equivalents, beginning of period                                               | 240,487,000    |   |
| Cash and cash equivalents, end of period                                                     | 202,291,000    |   |
| Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]                         |           |   |
| Net cash from operating activities                                                           | 17,069,000     |   |
| **Cash flows from investing activities:**                                                    |           |   |
| Capital expenditures for development of crude oil and natural gas properties                 | (135,452,000)  |   |
| Capital expenditures for other properties and equipment                                      | (507,000)      |   |
| Acquisition of crude oil and natural gas properties, including final settlement adjustments  | 5,372,000      |   |
| Proceeds from sale of properties and equipment                                               | 0              |   |
| Proceeds from Sale of Notes Receivable                                                       | 0              |   |
| Increase (Decrease) in Restricted Cash                                                       | 0              |   |
| Purchases of short-term investments                                                          | 0              |   |
| Proceeds from Sale of Short-term Investments                                                 | 0              |   |
| intercompany Transfer Investing Activities                                                   | 0              |   |
| Net cash from investing activities                                                           | (130,587,000)  |   |
| **Cash flows from financing activities:**                                                    |           |   |
| Proceeds from issuance of equity, net of issuance costs                                      | 0              |   |
| Treasury Stock, Value, Acquired, Cost Method                                                 | 0              |   |
| Other                                                                                        | (18,000)       |   |
| Intercompany Transfers Financing Activities                                                  | 109,923,000    |   |
| Net cash from financing activities                                                           | 109,905,000    |   |
| Net change in cash and cash equivalents                                                      | (3,613,000)    |   |
| Cash and cash equivalents, beginning of period                                               | 3,613,000      |   |
| Cash and cash equivalents, end of period                                                     | $ 0            |   |

| X                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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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| - Definition
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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| - Definition
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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| - Definition
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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| - Definition
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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| - Definition
The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use.
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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.
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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).
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| - Definition
The cash inflow from the additional capital contribution to the entity.
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Amount of cash inflow (outflow) from financing activities classified as other.
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The cash inflow associated with the sale of a borrowing supported by a written promise to pay an obligation.
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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.
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| - Definition
The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management 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.
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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 cash outflow from the amount of cash specifically reserved for the acquisition of oil and gas property.
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