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Dispositions, Assets Held for Sale and Discontinued Operations (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
properties
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Real property dispositions:      
Total Disposition $ 1,011,218 $ 1,852,400 $ 543,577
Gain (loss) on sales of real property, net 344,250 364,046 280,387
Net other assets/liabilities disposed 22,546 133,622 0
Proceeds from sales of real property 1,378,014 2,350,068 823,964
Net real estate investments 26,171,077 26,563,629  
Secured debt 2,608,976 3,477,699  
Senior housing - triple net      
Real property dispositions:      
Total Disposition $ 916,689 1,773,614 356,300
Number of properties classified as held for sale | properties 50    
Senior housing operating      
Real property dispositions:      
Total Disposition $ 74,832 0 0
Number of properties classified as held for sale | properties 3    
Outpatient medical      
Real property dispositions:      
Total Disposition [1] $ 19,697 78,786 181,553
Number of properties classified as held for sale | properties 20    
Land parcels      
Real property dispositions:      
Total Disposition $ 0 0 $ 5,724
Genesis HealthCare      
Real property dispositions:      
Loans received for termination fees   $ 74,445  
Principal oustanding on the loans received for termination fees 61,994    
Held for sale      
Real property dispositions:      
Net real estate investments 734,147    
Secured debt $ 66,872    
[1]
Dispositions occurring in the year ended December 31, 2015 primarily relate to the disposition of an unconsolidated equity investment with Forest City Enterprises.