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Commitments and Contingencies - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) community property Lease | Sep. 30, 2019 USD ($) community property Lease
Lessee, Lease, Description [Line Items] |  |
Number of office leases | Lease | 16 | 16
Operating lease assets | $ 99,270 | $ 99,270
Operating lease obligation | 116,489 | 116,489
Operating Lease, Cost | 3,618 | 10,723
Financing lease asset | 21,951 | 21,951
Financing lease obligation | $ 20,216 | $ 20,216
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 Operating Leases [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Number of operating apartment communities owned | community | 10 | 10
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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