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RESTRICTED STOCK UNITS (Tables)
 12 Months Ended
Dec. 31, 2016
Restricted Stock Units [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table summarizes restricted stock unit transactions in 2016, 2015 and 2014: 
 
 
Number of units
 
 
 
 
Directors

 
Management companies

 
Total

 
Fair value
Units outstanding as of December 31, 2013
 
17,632

 
17,632

 
35,263

 
$45.95
Granted
 
5,511

 
5,511

 
11,022

 
$47.40
Settled
 
(8,227
)
 
(8,227
)
 
(16,454
)
 
$46.60
Units outstanding as of December 31, 2014
 
14,916

 
14,916

 
29,832

 
$22.65
Granted
 
4,920

 
4,921

 
9,841

 
$21.50
Settled
 
(8,092
)
 
(8,093
)
 
(16,185
)
 
$22.20
Units outstanding as of December 31, 2015
 
11,744

 
11,744

 
23,488

 
$5.35
Settled
 
(11,744
)
 
—

 
(11,744
)
 
$3.64
Forfeited
 
—

 
(11,744
)
 
(11,744
)
 
-
Units outstanding as of December 31, 2016
 
—

 
—

 
—