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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Stock Based Compensation Plan [Abstract]  
Share Option and Award Activity
The following table summarizes our equity award activity during the years ended December 31, 2019, 2018, and 2017:

  
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, 2016
  
249,706
   
21.22
   
147,614
   
22.35
   
100,875
   
18.14
 
Granted/Issued
  
135,986
   
21.99
   
63,396
   
22.04
   
—
     
Awards vested or rights exercised
  
(128,691
)
  
20.73
   
(28,715
)
  
27.81
   
(43,875
)
  
18.14
 
Forfeited
  
(2,511
)
  
21.38
   
(2,521
)
  
20.60
   
—
     
Outstanding at December 31, 2017
  
254,490
   
21.88
   
179,774
   
21.42
   
57,000
   
18.14
 
Granted/Issued
  
141,722
   
22.73
   
103,940
   
22.95
   
—
   
—
 
Awards vested or rights exercised
  
(132,872
)
  
22.45
   
(48,661
)
  
24.10
   
—
   
—
 
Forfeited
  
(14,198
)
  
21.94
   
(25,299
)
  
21.40
   
—
   
—
 
Outstanding at December 31, 2018
  
249,142
   
22.05
   
209,754
   
21.56
   
57,000
   
18.14
 
Granted/Issued
  
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
   
(51,116
)
  
22.45
   
—
   
—
 
Outstanding at December 31, 2019
  
234,810
   
20.93
   
214,809
   
21.38
   
7,500
   
18.14
 
Exercisable at December 31, 2019
  
—
   
—
   
—
   
—
   
7,500
   
18.14
 
Restricted units expected to vest
  
234,810
   
20.93
   
136,668
   
21.99
   
—
   
—
 
Exercisable at December 31, 2018
  
—
   
—
   
—
   
—
   
57,000
   
18.14
 
Exercisable at December 31, 2017
  
—
   
—
   
—
   
—
   
57,000
   
18.14