| **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                                                                  | $ 26,846        | $ 23,023 | $ 22,200 |   |
| Stock-based Compensation - G&A                                                                |            |     |   |   |
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]** |            |     |   |   |
| Share based compensation expense                                                                  | 25,257          | 21,830   | 21,182 |   |
| Stock-based Compensation - LOE                                                                    |            |     |   |   |
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]** |            |     |   |   |
| Share based compensation expense                                                                  | $ 1,589         | $ 1,193  | $ 1,018 |   |
| 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 |
| Common stock shares remain avaliable for issuance                                                 | 3,840,404       |     |   |   |
| 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                                                 | 245,156         |     |   |   |
| 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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| - Definition
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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