Debt - Mortgage Notes Payable (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Weighted-Average Interest Rate	4.20%
Weighted-Average Years to Maturity	4 years 1 month 14 days
Mortgages [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	472
Gross Carrying Value of Collateralized Properties	$ 4,152,682
Outstanding Balance	$ 2,068,455	$ 2,071,038
Weighted-Average Interest Rate	4.93%
Mortgages [Member] \| Weighted-Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	3 years 11 months 6 days
Mortgages [Member] \| Fixed-rate debt [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	471
Gross Carrying Value of Collateralized Properties	$ 4,119,779
Outstanding Balance	$ 2,053,512
Weighted-Average Interest Rate	4.93%
Mortgages [Member] \| Fixed-rate debt [Member] \| Interest Rate Swap [Member]
Debt Instrument [Line Items]
Outstanding Balance	$ 78,600
Mortgages [Member] \| Fixed-rate debt [Member] \| Weighted-Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	3 years 11 months 15 days
Mortgages [Member] \| Variable-rate debt [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	1
Gross Carrying Value of Collateralized Properties	$ 32,903
Outstanding Balance	$ 14,943
Weighted-Average Interest Rate	5.06%
Mortgages [Member] \| Variable-rate debt [Member] \| Weighted-Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	4 months 19 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/presentationRef
-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 2: http://www.xbrl.org/2003/role/presentationRef
-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=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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