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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, 2022
Dec. 31, 2021
Restricted Stock    
Non-vested at beginning of period 321,883 358,512
Granted 194,791 191,479
Performance Shares Quantity Adjustment 9,255 54,306
Vested (234,482) (273,974)
Forfeited (1,625) (8,440)
Non-vested at end of period 289,822 321,883
Weighted-Average Grant Date Fair Value    
Non-vested at beginning of period $ 47.98 $ 41.23
Granted 84.29 69.38
Performance Shares Quantity Adjustment 55.51 54.21
Vested 67.22 55.11
Forfeited 78.86 43.48
Non-vested at end of period $ 56.93 $ 47.98