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

   
June 30, 2011
  
December 31, 2010
 
   
(In thousands)
 
Real estate properties:
      
   Land                                                                  
 $221,523   221,523 
   Buildings and building improvements                                                                  
  990,681   985,798 
   Tenant and other improvements                                                                  
  247,823   240,134 
Development                                                                  
  82,518   73,722 
    1,542,545   1,521,177 
   Less accumulated depreciation                                                                  
  (427,290)  (403,187)
   $1,115,255   1,117,990