| **Other Accrued Expenses Other Accrued Expenses (Details) - USD ($) $ in Thousands** | 3 Months Ended | 9 Months Ended |        |
|--------------------------------------------------------------------------------------|----------------|----------------|--------|
||
| **Schedule of Other Liabilities [Line Items]**                                       |           |           |   |   |
| Saddle Butte Rockies Midstream Amendment Payment                                     |           | $ 24,100       |   |   |
| Amortization of Other Deferred Charges                                               | $ 400          | 1,100          |   |   |
| Production Tax Liability                                                             | 44,817         | 44,817         |   | $ 50,476 |
| Other Accrued Liabilities, Noncurrent                                                | 76,987         | 76,987         |   | 57,333 |
| Non Current Liabilities                                                              |           |           |   |   |
| **Schedule of Other Liabilities [Line Items]**                                       |           |           |   |   |
| Increase (Decrease) in Accrued Cost of Oil and Gas Reclamation                       |           | 22,613         | $ 0    |   |
| Other Accrued Liabilities                                                            | 9,557          | 9,557          |   | 6,857 |
| Current Liabilities                                                                  |           |           |   |   |
| **Schedule of Other Liabilities [Line Items]**                                       |           |           |   |   |
| Other Accrued Liabilities                                                            | $ 3,284        | $ 3,284        |   | $ 3,429 |

| X                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Production Tax Liability
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Payment from Saddle Butte for the execution of an Amendment to an existing crude oil purchase and sale agreement, signed in December 2017.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
[Line Items] for Schedule of Other Liabilities [Table]
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The increase (decrease) during the reporting period in accrued costs that represent future cash outlays for restoration and reclamation of oil and gas producing properties.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expenses incurred but not yet paid classified as other.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expenses incurred but not yet paid classified as other, due after one year or the normal operating cycle, if longer.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of amortization of other deferred costs recognized in the income statement.
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