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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Share-based Compensation [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The activity in the Company’s restricted stock and restricted stock units for the nine months ended September 30, 2016 was as follows:

 
 
 
Number of Shares
 
Weighted Average
Grant Date Fair
Value
 
Unvested at January 1, 2016
 
456,570

 
$
55.70

 
Granted
 
241,681

 
64.10

 
Vested
 
(211,235
)
 
48.14

 
Forfeited
 
(4,133
)
 
59.67

 
Unvested at September 30, 2016
 
482,883

 
$
63.34