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Acquisitions of Real Estate Property - 2019 Acquisitions (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
property
Dec. 31, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
property
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]        
Number of real estate properties   1,200    
Payments to acquire real estate | $   $ 78,648 $ 958,125 $ 265,907
L G M Acquisition        
Business Acquisition [Line Items]        
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 87.00%      
Number of real estate properties 34      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | $ $ 1,800,000      
L G M Acquisition | Development Projects        
Business Acquisition [Line Items]        
Number of real estate properties 5      
Other 2019 Acquisitions        
Business Acquisition [Line Items]        
Number of real estate properties     2  
Vacant Land Parcels Acquired     1  
Payments to acquire real estate | $     $ 237,000  
Office operations | Other 2019 Acquisitions        
Business Acquisition [Line Items]        
Number of real estate properties     1  
Senior living operations | Other 2019 Acquisitions        
Business Acquisition [Line Items]        
Number of real estate properties     2