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NONCONTROLLING INTERESTS (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Operating Partnership Ownership      
Increase to OP units owned by third parties and a corresponding decrease to capital $ 2,915 $ 6,384  
Operating Partnership
      
Operating Partnership Ownership      
OP Units outstanding which are not owned by the general partner (as a percent) 1.70%   2.40%
Number of trading days used to determine average of the closing prices of the common shares 10 days    
OP units outstanding (in shares) 2,280,730   3,293,730
Increase to OP units owned by third parties and a corresponding decrease to capital $ 2,915 $ 6,384 $ 19,500