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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Stock-Based Compensation Plans [Abstract]  
Restricted and Performance-Based Share Activity
Our restricted and performance-based share activity was as follows for the years ended December 31, 2016 and 2015:
 
  
Shares
  
Weighted Average
Grant Date Fair
Value per Share
 
Balance at December 31, 2014
  
749,018
   
24.62
 
Granted
  
211,950
   
31.79
 
Vested
  
(192,768
)
  
22.13
 
Forfeited
  
(9,650
)
  
29.30
 
Balance at December 31, 2015
  
758,550
  
$
27.19
 
Granted
  
212,500
   
42.93
 
Vested
  
(138,427
)
  
31.55
 
Forfeited
  
(9,775
)
  
31.79
 
Balance at December 31, 2016
  
822,848
  
$
30.46