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Stock-based compensation (Tables)
 3 Months Ended
Mar. 31, 2023
Executive Officers  
Schedule of Unvested Restricted Stock Units Roll Forward
The
 
following
 
table
 
summarizes
 
the
 
restricted
 
stock
 
and
 
performance
 
shares
 
activity
 
under
 
the
 
Incentive
 
Plan
 
for
 
members
 
of
management.
(Not in thousands)
Shares
Weighted-Average
Grant Date Fair
Value
Non-vested at December 31, 2021
321,883
$
47.98
Granted
194,791
84.29
Performance Shares Quantity Adjustment
6,947
78.02
Vested
 
(240,033)
66.11
Forfeited
(1,625)
78.86
Non-vested at December 31, 2022
281,963
$
56.50
Granted
127,203
74.29
Performance Shares Quantity Adjustment
5,674
64.57
Vested
 
(128,027)
68.60
Forfeited
(12,375)
56.76
Non-vested at March 31, 2023
274,438
$
58.48
Directors  
Schedule of Unvested Restricted Stock Units Roll Forward
The following table summarizes the restricted stock
 
activity under the Incentive Plan for members of
 
the Board of Directors:
(Not in thousands)
Restricted Stock units
Weighted-Average
 
Grant Date Fair
Value per Unit
Non-vested at December 31, 2021
$
-
$
-
Granted
25,321
77.48
Vested
 
(25,321)
77.48
Forfeited
-
-
Non-vested at December 31, 2022
$
-
$
-
Granted
1,029
65.57
Vested
 
(1,029)
65.57
Forfeited
-
-
Non-vested at March 31, 2023
$
-
$
-