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Long-term incentive plan (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Threshold cash return on investment upon termination event to determine vesting of performance shares         $ 1,515,000
Share-based compensation expense $ 15,836 $ 2,328 $ 22,774 $ 3,903  
Unvested restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 1 year   4 years    
Granted (in shares) 413,234   2,725,991    
Share-based compensation expense $ 8,000   $ 8,000    
Unvested restricted stock units | Tranche one          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of RSUs that vest 50.00%   100.00%    
Vesting period     1 year    
Unvested restricted stock units | Tranche two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of RSUs that vest 50.00%