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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Mortgage notes
Dec. 31, 2012
Capital leases
Dec. 31, 2011
Capital leases
Dec. 31, 2012
Mortgage bonds
Dec. 31, 2011
Mortgage bonds
Dec. 31, 2012
Buildings and improvements
Dec. 31, 2012
Buildings and improvements
Maximum
Dec. 31, 2012
Equipment
SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION                    
Aggregate cost for federal income tax purposes $ 5,200,000,000                  
Real Estate And Accumulated Depreciation                    
Period over which real estate assets are depreciated, maximum               40 years 40 years 12 years
Secured debt $ 724,477,000 $ 861,615,000 $ 690,500,000 $ 13,792,000 $ 14,211,000 $ 14,700,000 $ 14,700,000