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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock option and restricted stock activities
A summary of UDR’s stock option and restricted stock activities during the year ended December 31, 2015 is as follows:
 
Option Outstanding
 
Option Exercisable
 
Restricted Stock
 
Number of
Options
 
Weighted
Average
Exercise
Price
 
Number of
Options
 
Weighted
Average
Exercise
Price
 
Number
of shares
 
Weighted
Average Fair
Value Per
Restricted Stock
Balance, December 31, 2014
2,265,842

 
$
12.82

 
2,265,842

 
$
12.82

 
999,978

 
$
23.98

Granted
—

 
—

 
—

 
—

 
551,293

 
32.67

Exercised
(30,879
)
 
25.10

 
(30,879
)
 
25.10

 
—

 
—

Vested
—

 
—

 
—

 
—

 
(736,204
)
 
23.52

Forfeited
—

 
—

 
—

 
—

 
(14,691
)
 
23.24

Balance, December 31, 2015
2,234,963

 
$
12.65

 
2,234,963

 
$
12.65

 
800,376

 
$
30.40