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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Change in total cost of properties      
Balance at beginning of year $ 5,851,887 $ 5,845,794 $ 5,938,200
Acquisitions and capital expenditures 563,793 145,948 81,786
Dispositions (42,668) (11,459) (10,511)
Loss on asset impairment (861) (16,384) (163,681)
Cost basis adjustment (19,863) (112,012)  
Balance at close of year 6,352,288 5,851,887 5,845,794
Change in accumulated depreciation      
Balance at beginning of year 1,181,413 1,133,924 973,801
Depreciation expense 182,782 164,706 170,634
Dispositions (19,604) (5,205) (10,511)
Cost basis adjustment (19,863) (112,012)  
Balance at close of year 1,324,728 1,181,413 1,133,924
Tax basis for federal income tax purpose $ 3,875,275