| **Properties and Equipment Assets Held for Sale (Details) - USD ($) $ in Thousands** | 3 Months Ended | 6 Months Ended |                |
|--------------------------------------------------------------------------------------|----------------|----------------|----------------|
||
| **Long Lived Assets Held-for-sale [Line Items]**                                     |           |           |           |   |   |
| Document Period End Date                                                             |           |           | Jun. 30,  2019 |   |   |
| Impairment of properties and equipment                                               | $ 28,979       | $ 159,554      | $ 36,854       | $ 192,742 |   |
| (Gain) loss on sale of properties and equipment                                      |           |           | (34,273)       | 1,081 |   |
| Assets                                                                               | 4,594,904      |           | 4,594,904      |   | $ 4,544,145 |
| Asset retirement obligations                                                         | 78,909         |           | 78,909         |   | 85,312 |
| Liabilities                                                                          | 2,216,498      |           | 2,216,498      |   | 2,017,437 |
| Proceeds from sale of properties and equipment                                       |           |           | 1,154          | $ 1,782 |   |
| Property, Plant and Equipment, Gross                                                 | $ 6,883,835    |           | $ 6,883,835    |   | 6,373,157 |
| Assets Held-for-sale, Not Part of Disposal Group, Other                              |           |           |           |   | 3,257 |
| Delaware Basin Assets [Member]                                                       |           |           |           |   |   |
| **Long Lived Assets Held-for-sale [Line Items]**                                     |           |           |           |   |   |
| Assets                                                                               |           |           |           |   | 140,705 |
| Asset retirement obligations                                                         |           |           |           |   | 4,111 |
| Liabilities                                                                          |           |           |           |   | 4,111 |
| Property, Plant and Equipment, Gross                                                 |           |           |           |   | $ 137,448 |

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.
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| - Definition
Noncurrent 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
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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| - Definition
Amount of other assets held-for-sale that are not part of a disposal group.
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| - Definition
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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| - Definition
Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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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.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.
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| - Definition
Costs related to the impairment of oil and gas properties.
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