| **Other Accrued Expenses Other Accrued Expenses (Details) - USD ($) $ in Thousands** | 3 Months Ended | 12 Months Ended |
|--------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Schedule of Other Liabilities [Line Items]**                                       |           |            |   |
| Saddle Butte Rockies Midstream Amendment Payment                                     | $ 24,100       |            |   |
| Production Tax Liability                                                             | 63,454         |            | $ 50,476 |
| Other Accrued Liabilities, Noncurrent                                                | 94,557         |            | 57,333 |
| Accrued Employee Benefits, Current                                                   | 10,901         |            | 22,383 |
| Asset Retirement Obligation, Current                                                 | 15,944         |            | 15,801 |
| Accrued Environmental Loss Contingencies, Current                                    | 2,074          |            | 1,374 |
| Gas Gathering, Transportation, Marketing and Processing Costs                        | (7,313)        | $ (5,902)       |   |
| Amortization of Other Deferred Charges                                               | 400            |            |   |
| Non Current Liabilities                                                              |           |            |   |
| **Schedule of Other Liabilities [Line Items]**                                       |           |            |   |
| Gas Gathering, Transportation, Marketing and Processing Costs                        | 21,608         |            | 0 |
| Other Accrued Liabilities                                                            | 9,495          |            | 6,857 |
| Current Liabilities                                                                  |           |            |   |
| **Schedule of Other Liabilities [Line Items]**                                       |           |            |   |
| Gas Gathering, Transportation, Marketing and Processing Costs                        | 2,010          |            | 0 |
| Other Accrued Liabilities                                                            | $ 2,848        |            | $ 3,429 |

| X                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Production Tax Liability
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Cost incurred related to the gas activities, such as transportation, marketing and processing crude oil, natural gas and refined petroleum products.
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| - Definition
Amount of expenses incurred but not yet paid classified as other.
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| - 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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