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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2017
Stockholders' Equity Note [Abstract]  
Restricted share activity
Restricted and performance stock activity for the three months ended March 31, 2017 is summarized below:
 
Restricted Shares
 
Performance Shares
 
Total
 
Weighted
Average
Grant Date
Fair Value
Unvested balance as of December 31, 2016
577,244

 
345,656

 
922,900

 
$
58.15

Granted
351,214

 

 
351,214

 
49.51

Vested
(208,425
)
 
(107,320
)
 
(315,745
)
 
51.88

Forfeited
(5,061
)
 

 
(5,061
)
 
63.71

Unvested balance as of March 31, 2017
714,972

 
238,336

 
953,308

 
57.02