Debt of the Operating Partnership (3.950% Notes due 2022) (Narrative) (Details) - Senior Notes: - 3.950% Notes Due 2022	Jun. 23, 2015 USD ($)	Sep. 30, 2015
Debt Instrument [Line Items]
Face amount	$ 500,000,000.0
Stated interest rate	3.95%	3.95%
Principal received relative to par value	99.236%
Unamortized discount	$ 3,800,000
Issuance cost	4,400,000
Proceeds from debt, net	$ 491,800,000
Maximum leverage ratio	60.00%
Maximum secured leverage ratio	40.00%
Minimum interest coverage ratio	1.50
Minimum unencumbered assets relative to aggregate principal of unsecured debt	150.00%

Debt Instrument, Covenant, Interest Coverage Ratio

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- Definition

Debt Instrument, Covenant, Leverage Ratio Allowable, Maximum

+ References

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- Definition

Debt Instrument, Covenant, Secured Leverage Ratio Allowable, Maximum

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- Definition

Debt Instrument, Covenant, Unencumbered Assets Relative to Aggregate Principal Amount of Unsecured Debt Required, Minimum

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No definition available.

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- Definition

Debt Instrument, Issuance As A Percentage Of Par

+ References

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

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-Topic 835

-SubTopic 30

-Section 45

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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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.

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

-Section 45

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-Section 55

-Paragraph 8

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- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

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- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

No definition available.

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