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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

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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