Property and equipment, net - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment, net	$ 747,581	$ 669,389
Total oil and natural gas properties (successful efforts), net
Property, Plant and Equipment [Line Items]
Less: accumulated DD&A and impairment	(368,636)	(234,265)
Total property and equipment, net	744,597	666,797
Proved oil and natural gas properties
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,013,952	777,558
Unproved oil and natural gas properties
Property, Plant and Equipment [Line Items]
Property and equipment, gross	97,706	121,929
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,575	1,575
Other property and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,348	6,059
Less: accumulated DD&A and impairment	(4,364)	(3,467)
Total property and equipment, net	$ 2,984	$ 2,592