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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Change in total cost of properties        
Balance at beginning of year   $ 5,845,794 $ 5,938,200 $ 5,875,450
Acquisitions and capital expenditures   145,948 81,786 73,471
Dispositions   (11,459) (10,511) (10,721)
Loss on asset impairment 163,681 16,384 163,681  
Cost basis adjustment   (112,012)    
Balance at close of year 5,845,794 5,851,887 5,845,794 5,938,200
Change in accumulated depreciation        
Balance at beginning of year   1,133,924 973,801 814,942
Depreciation expense   164,706 170,634 169,580
Dispositions   (5,205) (10,511) (10,721)
Cost basis adjustment   (112,012)    
Balance at close of year 1,133,924 1,181,413 1,133,924 973,801
Tax basis for federal income tax purpose   $ 3,819,168