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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