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Stock Incentive Plans (Tables)
 9 Months Ended
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of restricted common stock and performance based restricted stock unit in stock incentive plans
The following table summarizes restricted common stock and performance-based restricted stock unit activity in our stock incentive plans for the nine months ended September 30, 2014.
 
 
Restricted Common Stock
 
Restricted Stock Units
 
Number of Units
 
Weighted Average
Grant Date Fair Value
 
Number of
Units
 
Weighted Average
Grant Date Fair Value
Unvested at January 1, 2014
781,644

 
 
$
11.46

 
 
 
409,100

 
 
 
$
9.22

 
Granted
429,346

 
 
12.63

 
 
 
395,900

 
 
 
12.14

 
Vested
(55,168
)
 
 
(11.04
)
 
 
 
—

 
 
 
—

 
Forfeited
(23,590
)
 
 
(11.93
)
 
 
 
(20,600
)
 
 
 
(10.58
)
 
Unvested at September 30, 2014
1,132,232

 
 
11.91

 
 
 
784,400

 
 
 
10.66