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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ 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 210.5-02.29)

-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 30

-Article 5

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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

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

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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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Equity Issuances Amount Available For Issuance

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Common Share of Beneficial Interest (Narrative ) (Details) (USD $)	3 Months Ended	1 Months Ended
	Mar. 31, 2015	May 04, 2015	Dec. 31, 2014	Feb. 28, 2015	Apr. 18, 2013
Class of Stock [Line Items]
Shares issued (in shares)	123,585,000us-gaap_CommonStockSharesIssued		122,489,000us-gaap_CommonStockSharesIssued
ATM Equity Program [Member]
Class of Stock [Line Items]
Amount available for issuance, ATM equity program	$ 170,600,000
Shares issued (in shares)	809,100
Gross proceeds	29,360,000
ATM Equity Program [Member] \| Maximum [Member]
Class of Stock [Line Items]
Amount available for issuance, ATM equity program				200,000,000
Subsequent Event [Member] \| ATM Equity Program [Member]
Class of Stock [Line Items]
Shares issued (in shares)		319,600
Gross proceeds		11,400,000
Unsecured Revolving Credit Facility [Member]
Class of Stock [Line Items]
Maximum borrowing capacity under credit facility					$ 500,000,000