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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Stock-Based Compensation Plans [Abstract]  
Restricted and Performance-based Share Activity
Our restricted and performance-based share activity was as follows for the six months ended June 30, 2017:
 
  
Shares
  
Weighted Average
Grant Date Fair
Value Per Share
 
Balance at December 31, 2016
  
822,848
  
$
30.46
 
Granted
  
8,450
   
42.83
 
Vested
  
(14,634
)
  
29.17
 
Forfeited
  
(4,150
)
  
35.66
 
Balance at June 30, 2017
  
812,514
  
$
30.59