Asset Retirement Obligations (Details) $ in Thousands |
3 Months Ended |
|---|---|
|
Mar. 31, 2019
USD ($)
| |
| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | |
| Asset retirement obligations as of January 1, 2019 | $ 13,895 |
| Liabilities incurred | 264 |
| Liabilities divested and settled | (487) |
| Accretion expense | 218 |
| Asset retirement obligations as of March 31,2019 | $ 13,890 |