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REAL ESTATE PROPERTIES (Tables)
9 Months Ended
Sep. 30, 2011
REAL ESTATE PROPERTIES [Abstract] 
Schedule of Real Estate Properties
The Company's real estate properties at September 30, 2011 and December 31, 2010 were as follows:

 
September 30, 2011
December 31, 2010
 
(In thousands)
Real estate properties:
   
   Land                                                                  
$             226,398
           221,523
   Buildings and building improvements                                                                  
1,008,527
985,798
   Tenant and other improvements                                                                  
251,982
240,134
Development                                                                  
99,261
73,722
 
1,586,168
1,521,177
   Less accumulated depreciation                                                                  
(439,465)
(403,187)
 
$         1,146,703
        1,117,990