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Stock-based compensation - Summary of incentive plan for members of management (Details) - Performance Based Shares - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Restricted Stock    
Non-vested at beginning of period 299,896 281,963
Granted 241,744 257,757
Performance Shares Quantity Adjustment 6,739 19,753
Vested (285,048) (243,133)
Forfeited (2,952) (16,444)
Non-vested at end of period 260,379 299,896
Weighted-Average Grant Date Fair Value    
Non-vested at beginning of period $ 58.20 $ 56.50
Granted 86.60 66.01
Performance Shares Quantity Adjustment 85.37 75.32
Vested 75.54 66.31
Forfeited 64.83 55.82
Non-vested at end of period $ 67.13 $ 58.20