Debt Unsecured Revolving Credit Facility (Details) (Revolving Credit Facility [Member], USD $)	12 Months Ended	0 Months Ended
Dec. 31, 2014	Jan. 23, 2015
Line of Credit Facility [Line Items]
Term of facility	4 years
Extension period	1 year
Extension fee percent of outstanding commitments under revolving credit facility	0.20%
Subsequent Event [Member] \| Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Current borrowing capacity		$ 800,000,000.0
Maximum borrowing capacity		$ 1,250,000,000.00
Term of facility		4 years
Extension period		6 months
Extension fee percent of outstanding commitments under revolving credit facility		0.075%
Line of Credit Facility, Covenant Compliance, Maximum Leverage Ratio		60.00%
Line of Credit Facility, Covenant Compliance, Consolidated Secured Indebtedness to Total Asset Value		40.00%
Line of Credit Facility, Covenant Compliance, Percent of Tangible Net Worth as of September 30, 2014		80.00%
Line of Credit Facility, Covenant Compliance, Percent of Net Equity Proceeds Received		75.00%
Line of Credit Facility, Covenant Compliance, Adjusted EBITDA to Consolidated Fixed Charges		1.50
Line of Credit Facility, Covenant Compliance, Net Operating Income to Unsecured Debt		1.75
Line of Credit Facility, Covenant Compliance, Ratio of Total Unsecured Debt to Unencumbered Asset Value		60.00%
Line of Credit Facility, Covenant Compliance, Consolidated Secured Recourse Debt to Asset Value		10.00%
Eurodollar [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.925%
Eurodollar [Member] \| Minimum [Member] \| Subsequent Event [Member] \| Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.875%
Eurodollar [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.70%
Eurodollar [Member] \| Maximum [Member] \| Subsequent Event [Member] \| Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.60%
Base Rate [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.00%
Base Rate [Member] \| Minimum [Member] \| Subsequent Event [Member] \| Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.00%
Base Rate [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.70%
Base Rate [Member] \| Maximum [Member] \| Subsequent Event [Member] \| Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.60%

Line of Credit Facility, Covenant Compliance, Maximum Consolidated Secured Indebtedness to Asset Value

No definition available.

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- Definition

Line of Credit Facility, Covenant Compliance, Maximum Consolidated Secured Recourse Debt to Asset Value

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Maximum Leverage Ratio

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Maximum Ratio of Unsecured Debt to Unencumbered Asset Value

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Minimum Adjusted EBITDA to Consolidated Fixed Charges

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Minimum Net Operating Income to Unsecured Debt

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Minimum Percent of Tangible Net Worth

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Tangible Net Worth. Minimum Percent of Net Equity Proceeds Received

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Extension Fee, Percent of Outstanding Commitments Under Revolving Credit Facility

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Extension Period

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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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.

+ Details

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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 210.5-02.19(b),22(b))

-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 19, 22

-Article 5

+ Details

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- Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Balance Type:	credit
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