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Schedule III - Real Estate and Accumulated Depreciation (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Real estate:      
Balances at beginning of year $ 12,524,224 $ 10,616,690 $ 9,670,490
Acquisition of real estate and development and improvements 257,189 1,941,091 1,049,723
Disposition of real estate (78,151) (148,752) (21,737)
Impairments   (7,878)  
Balances associated with changes in reporting presentation (110,421) 123,073 (81,786)
Balances at end of year 12,592,841 12,524,224 10,616,690
Accumulated depreciation:      
Balances at beginning of year 1,694,892 1,408,310 1,188,539
Depreciation expense 353,344 302,332 294,480
Disposition of real estate (38,447) (32,942) (5,705)
Balances associated with changes in reporting presentation (44,197) 17,192 (69,004)
Balances at end of year $ 1,965,592 $ 1,694,892 $ 1,408,310