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Noncontrolling Interest (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2017
property
Dec. 31, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Noncontrolling Interest        
Number of properties included in joint venture agreement | property 1      
Net income attributable to noncontrolling interest   $ (5,146) $ (5,356) $ (5,542)
Distributions to noncontrolling interest   22,292 $ 21,583 $ 21,022
Carry amount of real estate assets in consolidated VIE   705,096    
Secured debt and finance leases, net   $ 620,000    
Joint Venture        
Noncontrolling Interest        
Ownership interest by noncontrolling owners   45.00%    
Ownership interest by parent   55.00%    
Boston Massachusetts | Joint Venture | Life Science        
Noncontrolling Interest        
Number of properties included in joint venture agreement | property   1