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REAL ESTATE PROPERTIES (Tables)
 3 Months Ended
Mar. 31, 2012
REAL ESTATE PROPERTIES [Abstract]  
Schedule of Real Estate Properties
The Company's real estate properties at March 31, 2012 and December 31, 2011 were as follows:

 
March 31, 2012
December 31, 2011
 
(In thousands)
Real estate properties:
   
   Land                                                                  
$             237,851
           235,394
   Buildings and building improvements                                                                  
1,069,005
1,056,783
   Tenant and other improvements                                                                  
262,603
258,267
Development                                                                  
112,703
112,149
 
1,682,162
1,662,593
   Less accumulated depreciation                                                                  
(464,873)
(451,805)
 
$         1,217,289
        1,210,788