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Investments in and Advances to Unconsolidated Joint Ventures (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
property
joint_venture
Dec. 31, 2018
USD ($)
joint_venture
Schedule of Equity Method Investments [Line Items]    
Investments in and advances to unconsolidated joint ventures $ 531,966 $ 540,088
CCRC JV    
Schedule of Equity Method Investments [Line Items]    
Property count (in properties) | property 15  
Investment ownership percentage 49.00%  
Investments in and advances to unconsolidated joint ventures $ 358,172 365,764
UK JV    
Schedule of Equity Method Investments [Line Items]    
Property count (in properties) | property 68  
Investment ownership percentage 49.00%  
Investments in and advances to unconsolidated joint ventures $ 102,692 101,735
MBK JV    
Schedule of Equity Method Investments [Line Items]    
Property count (in properties) | property 5  
Investment ownership percentage 50.00%  
Investments in and advances to unconsolidated joint ventures $ 34,935 35,435
Other SHOP JVs    
Schedule of Equity Method Investments [Line Items]    
Property count (in properties) | property 5  
Investments in and advances to unconsolidated joint ventures $ 24,684 25,493
Other SHOP JVs | Minimum    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage 50.00%  
Other SHOP JVs | Maximum    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage 90.00%  
Unconsolidated Development JVs    
Schedule of Equity Method Investments [Line Items]    
Number of unconsolidated joint ventures | joint_venture 4  
Vintage Park Development JV    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage 85.00%  
Waldwick    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage 85.00%  
Otay Ranch    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage 90.00%  
MBK Development JV    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage 50.00%  
Medical Office JVs    
Schedule of Equity Method Investments [Line Items]    
Property count (in properties) | property 3  
Investments in and advances to unconsolidated joint ventures $ 10,039 10,160
Number of unconsolidated joint ventures | joint_venture 3  
Medical Office JVs | Minimum    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage 20.00%  
Medical Office JVs | Maximum    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage 67.00%  
HCP Ventures IV, LLC    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage 20.00%  
HCP Ventures III, LLC    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage 30.00%  
Suburban Properties, LLC    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage 67.00%  
K&Y JVs    
Schedule of Equity Method Investments [Line Items]    
Property count (in properties) | property 3  
Investment ownership percentage 80.00%  
Investments in and advances to unconsolidated joint ventures $ 1,431 $ 1,430
Number of unconsolidated joint ventures | joint_venture 2 3
Advances to unconsolidated joint ventures, net    
Schedule of Equity Method Investments [Line Items]    
Investments in and advances to unconsolidated joint ventures $ 13 $ 71