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Real Estate Transactions - MSREI MOB JV (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2018
USD ($)
property
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Real Estate [Line Items]          
Payments to acquire real estate       $ 21,000  
Net real estate     $ 11,535,111   $ 10,209,450
Intangible assets acquired     $ 120,000    
MSREI JV          
Real Estate [Line Items]          
Ownership percentage (as a percent) 51.00%   51.00%    
Proceeds from contribution to a joint venture $ 298,000        
Number of properties contributed to joint venture | property 9        
Value of contributed properties $ 320,000        
Number of properties acquired | property 16        
Noncontrolling interest in VIE   $ 298,000   298,000  
Greenville Portfolio | MSREI JV          
Real Estate [Line Items]          
Payments to acquire real estate $ 285,000        
Lease term 10 years        
Net real estate   276,000   $ 276,000  
Intangible assets acquired   $ 20,000