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Stock incentive plan - Summary of company's activity under the Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restricted Stock Awards        
Awards granted (in shares) 94,007      
Awards granted (in dollars per share) $ 8.51      
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Income tax expense   $ 24,483 $ 12,850 $ 0
Restricted Stock Awards        
Restricted Stock Awards        
Beginning balance (in shares) 0 0    
Awards granted (in shares)   308,938    
Awards canceled/forfeited (in shares)   (12,948)    
Ending balance (in shares)   295,990 0  
Awards granted (in dollars per share)   $ 5.72    
Performance Stock Units        
Restricted Stock Awards        
Beginning balance (in shares) 0 0    
Awards granted (in shares)   26,574    
Ending balance (in shares)   26,574 0  
Awards granted (in dollars per share)   $ 6.01    
Stock Options        
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Beginning balance (in shares) 0 0    
Options granted (in shares)   392,108    
Options canceled/forfeited (in shares)   0    
Options exercised (in dollars per share)   $ 0    
Ending balance (in shares)   392,108 0  
Weighted average grant date fair value per share/unit (in dollars per share)   $ 8.45    
Outstanding, aggregate intrinsic value   $ 72    
Options exercisable   $ 24