Debt - Mortgage Notes Payable (Details) $ in Thousands	9 Months Ended
Sep. 30, 2020 USD ($) property	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Encumbered Properties \| property	3,820
Weighted-Average Interest Rate	4.19%
Weighted-Average Years to Maturity	4 years 7 months 6 days
Unconsolidated Joint Ventures debt outstanding		$ 269,300
Mortgages [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	279
Net Carrying Value of Collateralized Properties	$ 1,775,585
Outstanding Balance	$ 1,334,098	$ 1,529,057
Weighted-Average Interest Rate	4.99%
Mortgages [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	2 years 3 months 18 days
Mortgages [Member] \| Fixed-rate debt [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	278
Net Carrying Value of Collateralized Properties	$ 1,745,907
Outstanding Balance	$ 1,318,937
Weighted-Average Interest Rate	5.01%
Mortgages [Member] \| Fixed-rate debt [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	2 years 3 months 18 days
Mortgages [Member] \| Variable-rate debt [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	1
Net Carrying Value of Collateralized Properties	$ 29,678
Outstanding Balance	$ 15,161
Weighted-Average Interest Rate	3.75%
Mortgages [Member] \| Variable-rate debt [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	10 months 24 days
Unconsolidated Joint Ventures [Member]
Debt Instrument [Line Items]
Unconsolidated Joint Ventures debt outstanding	$ 534,300

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

Amount of debt for which creditor does not have general recourse to the debtor but rather has recourse only to the property used for collateral in the transaction or other specific property.

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- Definition

The number of real estate properties owned as of the balance sheet date.

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