| **Other Accrued Expenses Schedule of Other Accrued Expense (Details) - USD ($) $ in Thousands** | 3 Months Ended | 6 Months Ended | 12 Months Ended |
|-------------------------------------------------------------------------------------------------|----------------|----------------|-----------------|
||
| **Schedule of Other Accrued Expense [Line Items]**                                              |           |           |            |   |   |
| Document Period End Date                                                                        |           |           | Jun. 30,  2019  |   |   |
| Amortization of Other Deferred Charges                                                          | $ 500          | $ 400          | $ 1,000         | $ 700 |   |
| Accrued Employee Benefits, Current                                                              | 16,229         |           | 16,229          |   | $ 25,811 |
| Asset Retirement Obligation, Current                                                            | 29,853         |           | 29,853          |   | 25,598 |
| Other Nonoperating Expense                                                                      |           |           | 11,102          |   | 0 |
| Accrued Environmental Loss Contingencies, Current                                               | 2,424          |           | 2,424           |   | 3,038 |
| Operating and Finance Lease Liability, Current                                                  |           |           | 5,870           |   | 0 |
| Other accrued expenses                                                                          | 86,523         |           | 86,523          |   | 75,133 |
| Current Liabilities                                                                             |           |           |            |   |   |
| **Schedule of Other Accrued Expense [Line Items]**                                              |           |           |            |   |   |
| Other Accrued Liabilities                                                                       | 21,045         |           | 21,045          |   | 20,686 |
| Non Current Liabilities                                                                         |           |           |            |   |   |
| **Schedule of Other Accrued Expense [Line Items]**                                              |           |           |            |   |   |
| Other Accrued Liabilities                                                                       | 3,716          |           | $ 3,716         |   | 8,644 |
| Midstream Oil Gathering [Member]                                                                |           |           |            |   |   |
| **Schedule of Other Accrued Expense [Line Items]**                                              |           |           |            |   |   |
| Amortization of Other Deferred Charges                                                          | 28,900         |           |            |   |   |
| MIdstream Water Gathering [Member]                                                              |           |           |            |   |   |
| **Schedule of Other Accrued Expense [Line Items]**                                              |           |           |            |   |   |
| Amortization of Other Deferred Charges                                                          | 40,500         |           |            |   |   |
| Midstream Gas Gathering [Member]                                                                |           |           |            |   |   |
| **Schedule of Other Accrued Expense [Line Items]**                                              |           |           |            |   |   |
| Amortization of Other Deferred Charges                                                          | $ 110,200      |           |            |   |   |
| Treasury Stock, Common [Member]                                                                 |           |           |            |   |   |
| **Schedule of Other Accrued Expense [Line Items]**                                              |           |           |            |   |   |
| Other Nonoperating Expense                                                                      |           |           |            |   | $ 0 |

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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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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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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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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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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.
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Amount of expense related to nonoperating activities, classified as other.
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