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Organization (Details) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2012 sqft Building	Jan. 13, 2012	Dec. 31, 2011	Feb. 16, 2010 Private placement [Member]	Feb. 13, 2012 Public follow-on offering [Member]	Jan. 13, 2012 Public follow-on offering [Member]	Feb. 13, 2012 Additional offering [Member]	Feb. 16, 2010 Initial public offering [Member]	Feb. 16, 2010 Initial public offering [Member] Private placement [Member]
Organization (Textual) [Abstract]
Number of buildings owned by Company	54
Square feet of buildings	4,200,000
Common stock, shares issued	13,434,889	4,000,000	9,308,670	350,000		4,000,000	61,853	8,750,000
Common stock price per share		$ 14.25		$ 20.00		$ 14.25	$ 14.25	$ 20.00
Proceeds of offering, after deducting underwriting discount and offering costs					$ 54.7
Net proceeds of the IPO and the concurrent private placement									$ 169.8

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Proceeds from initial public offering and concurrent private placement net.

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Proceeds of offering after deducting underwriting discount and offering cost.

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Square feet of buildings.

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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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Price of a single share of a number of saleable stocks of a company.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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