Debt - Mortgage Notes Payable (Details)	9 Months Ended
Sep. 30, 2019 USD ($) property	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Encumbered Properties \| property	3,926
Weighted-Average Interest Rate	4.49%
Weighted-Average Years to Maturity	4 years 2 months 12 days
Unconsolidated Joint Ventures debt outstanding	$ 269,300,000	$ 0
Mortgages [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	412
Gross Carrying Value of Collateralized Properties	$ 3,455,421,000
Outstanding Balance	$ 1,716,199,000	$ 1,917,132,000
Weighted-Average Interest Rate	5.05%
Mortgages [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	2 years 10 months 24 days
Mortgages [Member] \| Fixed-rate debt [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	411
Gross Carrying Value of Collateralized Properties	$ 3,421,417,000
Outstanding Balance	$ 1,702,425,000
Weighted-Average Interest Rate	5.05%
Mortgages [Member] \| Fixed-rate debt [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted-Average Interest Rate	3.57%
Weighted-Average Years to Maturity	2 years 10 months 24 days
Mortgages [Member] \| Variable-rate debt [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	1
Gross Carrying Value of Collateralized Properties	$ 34,004,000
Outstanding Balance	$ 13,774,000
Weighted-Average Interest Rate	5.29%
Mortgages [Member] \| Variable-rate debt [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	27 days

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=109500613&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=119400593&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=6877327&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=6876686&loc=d3e534808-122878

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Balance Type:	credit
Period Type:	instant

- 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

No definition available.

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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

No definition available.

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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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.

+ References

No definition available.

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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

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