XML 247 R220.htm IDEA: XBRL DOCUMENT v3.22.4
Stock-based compensation - Summary of incentive plan for members of management (Details) - Performance Based Shares - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Restricted Stock      
Non-vested at beginning of period 321,883 358,512 345,365
Granted 194,791 191,479 253,943
Performance Shares Quantity Adjustment 6,947 54,306 (7)
Vested (240,033) (273,974) (234,421)
Forfeited (1,625) (8,440) (6,368)
Non-vested at end of period 281,963 321,883 358,512
Weighted-Average Grant Date Fair Value      
Non-vested at beginning of period $ 47.98 $ 41.23 $ 41.68
Granted 84.29 69.38 42.49
Performance Shares Quantity Adjustment 78.02 54.21 48.79
Vested 66.11 55.11 42.64
Forfeited 78.86 43.48 44.26
Non-vested at end of period $ 56.50 $ 47.98 $ 41.23