Income taxes - Net deferred tax asset (liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Net operating loss carryforward	$ 307,357	$ 445,426
Equity-based compensation	2,933	11,123
Derivatives	0	36,639
Other	1,110	3,227
Total deferred tax asset	311,400	496,415
Valuation allowance	(298,184)	(443,390)
Deferred tax assets, net of valuation allowance	13,216	53,025
Deferred tax liabilities:
Oil and natural gas properties, midstream service assets and other fixed assets	(11,105)	(53,868)
Derivatives	(2,331)	0
Total deferred tax liabilities	(13,436)	(53,868)
Texas net deferred tax liability	$ (220)	$ (843)