Organization (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012 sqft Building	Feb. 16, 2010 Initial public offering [Member] Private placement [Member]
Organization (Textual) [Abstract]
Number of buildings owned by Company	63
Square feet of buildings owned	4,800,000
Net proceeds of the IPO and the concurrent private placement		$ 169.8

Proceeds from initial public offering and concurrent private placement net.

No definition available.

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