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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2014
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 six months ended June 30, 2014 was as follows:

 
 
 
Number of Shares
 
Weighted Average
Grant-Date Fair
Value
 
Unvested at January 1, 2014
 
708,221

 
$
33.41

 
Granted
 
271,902

 
56.84

 
Vested
 
(550,132
)
 
50.89

 
Forfeited
 
(8,063
)
 
29.00

 
Unvested at June 30, 2014
 
421,928

 
$
46.32