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Debt - Mortgage Debt (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
facility
Dec. 31, 2020
USD ($)
facility
Dec. 31, 2019
USD ($)
Apr. 30, 2021
USD ($)
Debt Instrument [Line Items]        
Long-term debt, gross $ 6,216,234      
Weighted-average interest rate (as a percent) 0.32% 0.30%    
Mortgage Debt | Medical Office        
Debt Instrument [Line Items]        
Face amount       $ 142,000
Weighted-average interest rate (as a percent)       2.77%
Mortgage Debt        
Debt Instrument [Line Items]        
Long-term debt, gross $ 350,259 $ 217,000    
Number of healthcare facilities used to secure debt (in facilities) | facility 18 6    
Debt instrument, collateral, healthcare facilities carrying value $ 811,000 $ 517,000    
Debt instrument, periodic payment, principal $ 9,000 $ 5,000 $ 1,000  
Weighted-average interest rate (as a percent) 3.31%