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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, 2023
Dec. 31, 2022
Restricted Stock    
Non-vested at beginning of period 281,963 321,883
Granted 127,203 194,791
Performance Shares Quantity Adjustment 5,674 6,947
Vested (128,027) (240,033)
Forfeited (12,375) (1,625)
Non-vested at end of period 274,438 281,963
Weighted-Average Grant Date Fair Value    
Non-vested at beginning of period $ 56.50 $ 47.98
Granted 74.29 84.29
Performance Shares Quantity Adjustment 64.57 78.02
Vested 68.60 66.11
Forfeited 56.76 78.86
Non-vested at end of period $ 58.48 $ 56.50