Property and equipment - Other property and equipment information (Details) $ in Thousands |
3 Months Ended | |
---|---|---|
Mar. 31, 2020
USD ($)
$ / Boe
|
Mar. 31, 2019
USD ($)
$ / Boe
|
|
Property, Plant and Equipment [Abstract] | ||
Depletion of Oil and Gas Properties | $ 57,752 | $ 59,370 |
Capitalized related employee costs | $ 4,505 | $ 6,682 |
Depletion expense (in dollars per BOE) | $ / Boe | 7.33 | 8.76 |