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Stock-Based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2021
Stock-Based Compensation Plans [Abstract]  
Equity Award Activity

The following table summarizes our equity award activity during the years ended December 31, 2021, 2020, and 2019:


 
Service-Based
Restricted Stock Awards
   
Performance-Based
Restricted Stock Awards
   
Stock-Settled
Appreciation Rights
 
   
Shares or Units (#)
   
Weighted-Average
Award Price($)
   
Shares or Units(#)
   
Weighted-Average
Award Price ($)
   
Rights(#)
   
Weighted-Average
Award Price($)
 
Outstanding at December 31, 2018
   
249,142
     
22.05
     
209,754
     
21.56
     
57,000
     
18.14
 
Granted
   
137,768
     
20.24
     
113,522
     
20.29
     
     
 
Awards vested or rights exercised
   
(133,364
)
   
22.27
     
(57,351
)
   
18.93
     
(49,500
)
   
18.14
 
Forfeited
   
(18,736
)
   
21.25
     
(11,150
)
   
21.43
     
     
 
Units forfeited due to performance
                (39,966 )     22.95              
Outstanding at December 31, 2019
   
234,810
     
20.93
     
214,809
     
21.38
     
7,500
     
18.14
 
Granted
   
145,375
     
20.42
     
120,727
     
20.42
     
     
 
Awards vested or rights exercised
   
(130,434
)
   
20.69
     
(44,875
)
   
22.12
     
(7,500
)
   
18.14
 
Forfeited
   
(10,470
)
   
20.41
     
(273
)
   
20.37
     
     
 
Units forfeited due to performance
                (76,493 )     20.29              
Outstanding at December 31, 2020
   
239,281
     
20.77
     
213,895
     
21.08
     
     
 
Granted
   
120,221
     
33.29
     
93,685
     
32.83
     
     
 
Awards vested or rights exercised
   
(130,323
)
   
21.28
     
(56,578
)
   
22.95
     
     
 
Forfeited
   
(10,097
)
   
25.85
     
     
     
     
 
Additional units earned due to performance
                77,265       20.42              
Outstanding at December 31, 2021
   
219,082
     
27.10
     
328,267
     
23.96
             
Restricted units expected to vest
   
219,082
     
27.10
     
387,516
     
25.36
     
     
 
Exercisable at December 31, 2019
   
     
     
     
     
7,500
     
18.14