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Real Estate Transactions - 2019 Real Estate Investments (Details)
$ in Thousands
1 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended
Aug. 31, 2019
USD ($)
deposit
Jul. 31, 2019
USD ($)
property
facility
Jun. 30, 2019
USD ($)
property
May 31, 2019
USD ($)
property
Apr. 30, 2019
USD ($)
property
Nov. 30, 2018
USD ($)
property
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
asset
Sep. 30, 2019
USD ($)
property
Sep. 30, 2018
USD ($)
Real Estate [Line Items]                    
Payments to acquire real estate                   $ 21,000
Long-term debt                 $ 6,549,877  
Gain (loss) on consolidation           $ 50,000     11,481 $ (41,017)
Life science joint ventures                    
Real Estate [Line Items]                    
Payments to acquire real estate     $ 245,000              
Number of properties acquired | property     2              
Life science | Life science facility                    
Real Estate [Line Items]                    
Payments to acquire real estate             $ 71,000      
Life science | Land                    
Real Estate [Line Items]                    
Payments to acquire real estate             $ 27,000      
Senior Housing                    
Real Estate [Line Items]                    
Number of properties acquired | property     1              
Payments to acquire outstanding equity interests     $ 24,000              
Investment ownership percentage     100.00%              
Gain (loss) on consolidation     $ 12,000              
Gain on consolidation, tax     $ 1,000              
Senior Housing | Senior Housing                    
Real Estate [Line Items]                    
Payments to acquire real estate   $ 284,000   $ 113,000 $ 445,000          
Number of properties acquired | property   5   3 9          
Life science joint ventures                    
Real Estate [Line Items]                    
Payments to acquire real estate           $ 92,000        
Number of properties acquired | property           4        
Investment ownership percentage           100.00%        
Mortgage Debt                    
Real Estate [Line Items]                    
Long-term debt   $ 112,000   $ 50,000         $ 262,084  
San Diego | Life science                    
Real Estate [Line Items]                    
Number of properties acquired | property                 1  
San Diego | Life science | Life science facility                    
Real Estate [Line Items]                    
Payments to acquire real estate                 $ 16,000  
Boston | Life science | Life science facility                    
Real Estate [Line Items]                    
Payments to acquire real estate   $ 228,000                
Number of properties acquired | facility   4                
KANSAS | Medical office                    
Real Estate [Line Items]                    
Payments to acquire real estate                 $ 15,000  
Number of properties acquired | property                 1  
Cambridge | Life science | Life science facility                    
Real Estate [Line Items]                    
Payments to acquire real estate $ 33,000                  
Number of nonrefundable deposits | deposit 2                  
Forecast | Cambridge | Life science | Life science facility                    
Real Estate [Line Items]                    
Payments to acquire real estate               $ 333,000    
Number of properties acquired | asset               1