| **Impairment of Natural Gas and Crude Oil Properties (Details) - USD ($) $ in Thousands** | 3 Months Ended | 12 Months Ended |
|-------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Impairment of natural gas and crude oil properties [Line Items]**                       |           |            |   |   |
| Delaware Basin Proved Property Impairment                                                 | $ 753,000      |            |   |   |
| Delaware Basin Unproved Property Impairment                                               | 127,300        |            |   |   |
| Impairment of Oil and Gas Properties                                                      |           | $ 6,762         | $ 402 | $ 881,238 |
| Impairment of Long-Lived Assets to be Disposed of                                         |           | 0               | 0 | 1,155 |
| Results of Operations, Impairment of Oil and Gas Properties                               | $ 881,100      | $ 6,762         | $ 402 | $ 882,393 |
| Impairment Measurement Input                                                              |           |            |   | 17.00% |

| X                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Delaware Basin Proved Property Impairment
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Delaware Basin Unproved Property Impairment
+ References
No definition available.
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| X                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Impairment Measurement Input
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
[Line Items] for Impairment of natural gas and crude oil properties [Table]
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Costs related to the impairment of oil and gas properties.
+ References
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