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Stock-based compensation - Summary of incentive plan for members of management (Details) - Performance Based Shares - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Restricted Stock    
Non-vested at beginning of period 281,963 321,883
Granted 258,018 194,791
Performance Shares Quantity Adjustment 11,499 6,947
Vested (223,471) (240,033)
Forfeited (15,371) (1,625)
Non-vested at end of period 312,638 281,963
Weighted-Average Grant Date Fair Value    
Non-vested at beginning of period $ 56.50 $ 47.98
Granted 67.04 84.29
Performance Shares Quantity Adjustment 75.96 78.02
Vested 66.77 66.11
Forfeited 55.82 78.86
Non-vested at end of period $ 58.20 $ 56.50