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Debt - Mortgage Debt (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
derivativeHeld
facility
Mar. 31, 2021
USD ($)
Apr. 30, 2022
derivativeHeld
Dec. 31, 2021
USD ($)
facility
derivativeHeld
Apr. 30, 2021
USD ($)
Debt Instrument          
Principal balance on debt $ 6,379,802        
Interest-rate Swap Contracts          
Debt Instrument          
Number of interest-rate contracts held | derivativeHeld 0     0  
Subsequent Event | Interest-rate Swap Contracts | Cash Flow Hedging | Designated as Hedging Instrument          
Debt Instrument          
Number of interest-rate contracts held | derivativeHeld     2    
Medical Office Buildings | Mortgage Debt          
Debt Instrument          
Amount       $ 142,000 $ 142,000
Mortgage Debt          
Debt Instrument          
Principal balance on debt $ 348,989     $ 350,000  
Number of healthcare facilities used to secure debt (in facilities) | facility 18     18  
Debt instrument, collateral, healthcare facilities carrying value $ 803,000     $ 811,000  
Debt instrument, periodic payment $ 1,000 $ 1,000