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Stock-based compensation - Summary of incentive plan for members of management (Details) - Performance Based Shares - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Restricted Stock    
Non-vested at beginning of period 299,896 281,963
Granted 143,084 257,757
Performance Shares Quantity Adjustment 33,858 19,753
Vested (185,177) (243,133)
Forfeited 411 (16,444)
Non-vested at end of period 292,072 299,896
Weighted-Average Grant Date Fair Value    
Non-vested at beginning of period $ 58.20 $ 56.50
Granted 85.57 66.01
Performance Shares Quantity Adjustment 88.92 75.32
Vested 79.81 66.31
Forfeited 69.92 55.82
Non-vested at end of period $ 61.48 $ 58.20