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Commitments and Contingencies - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) community Lease property | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) community Lease property | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |
Number Of Office Leases | Lease | 14 |  | 14 |  |
Operating lease assets | $ 138,113 |  | $ 138,113 |  | $ 103,063
Operating lease obligation | 163,321 |  | 163,321 |  | 120,261
Operating Lease, Expense | 4,240 | $ 3,568 | 8,157 | $ 7,105 |
Financing lease asset | 21,791 |  | 21,791 |  | 21,898
Financing lease obligation | $ 20,186 |  | $ 20,186 |  | $ 20,207
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 |  |
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=121609121&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=121603541&loc=SL77918627-209977 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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