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Summary of significant accounting policies - Equity Investments (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Class of Stock [Line Items]        
Unrealized gain on equity investments   $ 508 $ 0 $ 0
Common Stock | 2023 Divestitures | Vital Energy, Inc        
Class of Stock [Line Items]        
Noncash or part noncash divestiture, consideration received (in shares) 561,752      
Convertible Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, dividend rate (in percent) 2.00%      
Convertible Preferred Stock | 2023 Divestitures | Vital Energy, Inc        
Class of Stock [Line Items]        
Noncash or part noncash divestiture, consideration received (in shares) 541,155