Debt (Mortgage Notes Payable) (Details)	9 Months Ended
Sep. 30, 2015 USD ($) property	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Weighted-Average Interest Rate	3.65%
Weighted-Average Years to Maturity	4 years
Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	678
Gross Carrying Value of Collateralized Properties	$ 6,274,768,000
Outstanding Balance	$ 3,233,275,000	$ 3,689,796,000
Weighted-Average Interest Rate	5.02%
Mortgage Notes Payable [Member] \| Unconsolidated Joint Venture [Member]
Debt Instrument [Line Items]
Outstanding Balance	$ 103,400,000
Mortgage Notes Payable [Member] \| Weighted-Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	5 years 3 months 18 days
Mortgage Notes Payable [Member] \| Fixed-rate debt [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	677
Gross Carrying Value of Collateralized Properties	$ 6,250,140,000
Outstanding Balance	$ 3,225,103,000
Weighted-Average Interest Rate	5.03%
Mortgage Notes Payable [Member] \| Fixed-rate debt [Member] \| Interest Rate Swap [Member]
Debt Instrument [Line Items]
Outstanding Balance	$ 284,800,000
Mortgage Notes Payable [Member] \| Fixed-rate debt [Member] \| Weighted-Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	5 years 4 months 24 days
Mortgage Notes Payable [Member] \| Variable-rate debt [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	1
Gross Carrying Value of Collateralized Properties	$ 24,628,000
Outstanding Balance	$ 8,172,000
Weighted-Average Interest Rate	3.15%
Mortgage Notes Payable [Member] \| Variable-rate debt [Member] \| Weighted-Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity	11 months 1 day
Mortgage Notes Payable [Member] \| Recourse debt [Member] \| Unconsolidated Joint Venture [Member]
Debt Instrument [Line Items]
Outstanding Balance	$ 0
Mortgages Secured by Assets Held for Sale [Member]
Debt Instrument [Line Items]
Outstanding Balance	$ 124,300,000

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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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

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

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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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