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Commitments and Contingencies - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
community
property
Lease
Jun. 30, 2019
USD ($)
community
property
Lease
Lessee, Lease, Description [Line Items]    
Number of office leases | Lease 15 15
Number of leases not yet commenced | Lease 2 2
Operating lease assets | $ $ 100,377,000 $ 100,377,000
Operating lease obligation | $ 117,938,000 117,938,000
Operating Lease, Cost | $ 3,568,000 7,105,000
Financing lease asset | $ 22,004,000 22,004,000
Financing lease obligation | $ $ 20,225,000 $ 20,225,000
Properties on Land Subject to Land Leases    
Lessee, Lease, Description [Line Items]    
Number of operating apartment communities owned | community 11 11
Number of operating apartment communities under construction | community 1 1
Number of commercial properties owned | property 2 2
Number of leased properties under purchase options | property   5
Assets Held under Finance Leases [Member]    
Lessee, Lease, Description [Line Items]    
Number of operating apartment communities owned | community 1 1
Number of Finance Leases for Parking Garages Adjacent to Communities | Lease 2 2
Number of Finance Leases for Parking Garage Adjacent to Operating Community | Lease 1 1
Number of Finance Leases for Parking Garage Adjacent to Development Community | Lease 1 1