Debt (Mortgage Notes Payable) (Details)	9 Months Ended
Sep. 30, 2016 USD ($) property	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Weighted-Average Interest Rate	4.30%
Weighted-Average Years to Maturity	4 years 6 months
Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	643
Gross Carrying Value of Collateralized Properties	$ 5,510,953,000
Outstanding Balance	$ 2,813,829,000	$ 3,039,882,000
Weighted-Average Interest Rate	5.01%
Mortgage Notes Payable [Member] \| Unconsolidated Joint Venture [Member]
Debt Instrument [Line Items]
Outstanding Balance	$ 46,200,000
Weighted-Average Interest Rate	3.93%
Mortgage Notes Payable [Member] \| Weighted-Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	4 years 7 months 6 days
Mortgage Notes Payable [Member] \| Weighted-Average [Member] \| Unconsolidated Joint Venture [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	2 years 1 month 10 days
Mortgage Notes Payable [Member] \| Minimum [Member] \| Unconsolidated Joint Venture [Member]
Debt Instrument [Line Items]
Fixed and variable rate, maximum	2.93%
Mortgage Notes Payable [Member] \| Maximum [Member] \| Unconsolidated Joint Venture [Member]
Debt Instrument [Line Items]
Fixed and variable rate, maximum	5.20%
Mortgage Notes Payable [Member] \| Fixed-rate debt [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	642
Gross Carrying Value of Collateralized Properties	$ 5,484,499,000
Outstanding Balance	$ 2,804,142,000
Weighted-Average Interest Rate	5.01%
Mortgage Notes Payable [Member] \| Fixed-rate debt [Member] \| Interest Rate Swap [Member]
Debt Instrument [Line Items]
Outstanding Balance	$ 242,400,000
Mortgage Notes Payable [Member] \| Fixed-rate debt [Member] \| Weighted-Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	4 years 7 months 6 days
Mortgage Notes Payable [Member] \| Variable-rate debt [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	1
Gross Carrying Value of Collateralized Properties	$ 26,454,000
Outstanding Balance	$ 9,687,000
Weighted-Average Interest Rate	3.79%
Mortgage Notes Payable [Member] \| Variable-rate debt [Member] \| Weighted-Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	10 months 24 days
Mortgage Notes Payable [Member] \| Recourse debt [Member] \| Unconsolidated Joint Venture [Member]
Debt Instrument [Line Items]
Outstanding Balance	$ 0

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

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- 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=6479336&loc=d3e64711-112823

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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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.

+ References

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- Definition

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

+ References

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