XML 102 R88.htm IDEA: XBRL DOCUMENT v3.24.0.1
Stock-Based Compensation Plan - Restricted Stock Unit Award Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 12, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
The 2018 LTIP | Restricted stock unit awards        
Number of Shares        
Beginning balance (in shares)   70,244 38,265 27,490
Granted (in shares)   23,409 26,796 26,369
Vested (in shares)   (32,399) (21,814) (14,244)
Forfeited (in shares)   (2,667) (3,521) (1,350)
Ending balance (in shares)   58,587 70,244 38,265
Weighted Average Grant Date Fair Value per Share        
Beginning balance (in dollars per share)   $ 31.89 $ 28.78 $ 28.64
Granted (in dollars per share)   57.18 31.83 29.70
Vested (in dollars per share)   32.15 29.22 30.20
Forfeited (in dollars per share)   46.95 30.33 28.92
Ending balance (in dollars per share)   $ 41.16 $ 31.89 $ 28.78
Aggregate grant date fair value awards issues $ 1.0 $ 1.3 $ 0.9 $ 0.8
The 2018 LTIP | Restricted stock unit awards | Minimum        
Weighted Average Grant Date Fair Value per Share        
Granted (in dollars per share)   $ 37.56 $ 31.80 $ 29.70
The 2018 LTIP | Restricted stock unit awards | Maximum        
Weighted Average Grant Date Fair Value per Share        
Granted (in dollars per share)   $ 58.05 $ 37.42 $ 30.00
The 2018 LTIP | Performance share unit awards        
Number of Shares        
Beginning balance (in shares)   30,687 21,492 16,241
Granted (in shares)   12,061 13,458 12,205
Awards increased (cancelled) due to performance factor increase (decrease) (in shares)   (11,824) 159 (4,493)
Vested (in shares)   (12,680) (3,125) (2,461)
Forfeited (in shares)   (820) (1,297) 0
Ending balance (in shares)   17,424 30,687 21,492
Weighted Average Grant Date Fair Value per Share        
Beginning balance (in dollars per share)   $ 28.59 $ 26.64 $ 27.67
Granted (in dollars per share)   56.84 31.80 29.70
Awards increased due to performance factor increase (decrease) (in dollars per share)   56.82 31.80 29.70
Vested (in dollars per share)   25.12 38.22 43.00
Forfeited (in dollars per share)   38.86 30.87 0
Ending balance (in dollars per share)   $ 31.03 $ 28.59 $ 26.64
Aggregate grant date fair value awards issues   $ 0.7 $ 0.4 $ 0.4
Performance factor   100.00% 100.00% 63.10%
The 2018 LTIP | Performance share unit awards | Plan        
Weighted Average Grant Date Fair Value per Share        
Performance factor   0.00% 1.014% 100.00%
The 2018 LTIP | Performance share unit awards | Minimum        
Weighted Average Grant Date Fair Value per Share        
Granted (in dollars per share)   $ 38.42    
The 2018 LTIP | Performance share unit awards | Maximum        
Weighted Average Grant Date Fair Value per Share        
Granted (in dollars per share)   $ 58.05    
Inducement Awards | Restricted stock unit awards        
Number of Shares        
Granted (in shares)     30,518  
Weighted Average Grant Date Fair Value per Share        
Granted (in dollars per share)     $ 33.75