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Leases - Ground Leases (Details)
ft² in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
property
lease
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
ft²
property
lease
Jun. 30, 2021
USD ($)
Lessee, Lease, Description [Line Items]        
Number of properties subject to ground leases | property 108   108  
Square feet subject to ground leases | ft²     8.9  
Number of prepaid ground leases     41  
Amortization of prepaid rent | $ $ 0.1 $ 0.2 $ 0.3 $ 0.3
Number of non-prepaid ground leases 67   67  
Minimum        
Lessee, Lease, Description [Line Items]        
Ground lease, initial term 40 years   40 years  
Maximum        
Lessee, Lease, Description [Line Items]        
Ground lease, initial term 99 years   99 years