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Acquisitions and Dispositions - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
condominium_units
states
healthcareproperty
Sep. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Business Acquisition [Line Items]      
Number of states in which operating healthcare properties and land parcel located | states 5    
Buyout of redeemable noncontrolling interest $ 2,800    
Purchase price 248,300 $ 248,328  
Real estate revenues 76,666   $ 44,134
Net income 6,716   $ 5,424
Loans      
Business Acquisition [Line Items]      
Mortgage loans on real estate, new mortgage loans $ 2,300    
Series of Individually Immaterial Business Acquisitions      
Business Acquisition [Line Items]      
Number of operating healthcare properties | healthcareproperty 7    
Number of condominium units | condominium_units 2    
Payments to acquire businesses, gross $ 243,200    
Real estate revenues 1,800    
Net income (2,800)    
Transaction costs $ 3,300