| **Common Stock Stocked Based Compensation Summary (Details) - USD ($) $ in Thousands**            | 12 Months Ended |          |          |
|---------------------------------------------------------------------------------------------------|-----------------|----------|----------|
||
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]** |            |     |     |   |   |
| Share based compensation expense                                                                  | $ 23,023        | $ 22,200 | $ 23,837 |   |   |
| Stock-based Compensation - G&A                                                                |            |     |     |   |   |
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]** |            |     |     |   |   |
| Share based compensation expense                                                                  | 21,830          | 21,182   | 22,754   |   |   |
| Stock-based Compensation - LOE                                                                    |            |     |     |   |   |
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]** |            |     |     |   |   |
| Share based compensation expense                                                                  | $ 1,193         | $ 1,018  | $ 1,083  |   |   |
| 2018 Equity Incentive Plan [Member]                                                               |            |     |     |   |   |
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]** |            |     |     |   |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized    |            |     |     | 7,050,000 | 1,800,000 |
| Common stock shares remain avaliable for issuance                                                 | 4,177,611       |     |     |   |   |
| 2010 Long-Term Equity Compensation Plan [Member]                                                  |            |     |     |   |   |
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]** |            |     |     |   |   |
| Common stock shares remain avaliable for issuance                                                 | 314,413         |     |     |   |   |
| Minimum [Member]                                                                                  |            |     |     |   |   |
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]** |            |     |     |   |   |
| Performance Shares Payout Range                                                                   | 0.00%           |     |     |   |   |
| Maximum [Member]                                                                                  |            |     |     |   |   |
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]** |            |     |     |   |   |
| Performance Shares Payout Range                                                                   | 250.00%         |     |     |   |   |
| Restricted Stock [Member]                                                                         |            |     |     |   |   |
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]** |            |     |     |   |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award                 | three-year      |     |     |   |   |

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Common stock shares which are authorized but remain avaliable for issuance.
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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.
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Number of shares authorized for issuance under share-based payment arrangement.
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Description of terms of award under share-based payment arrangement.
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