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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Aug. 07, 2012 sqft Building	Aug. 02, 2012 sqft	Jul. 31, 2012 sqft	Jul. 23, 2012 sqft	Jul. 03, 2012 sqft
Summary of Company's subsequent acquisitions of properties
Number of Buildings	3
Square feet	203,291	24,277	103,200	74,679	171,707
Purchase Price	$ 19,010
Assumed Debt	9,700
Los Angeles [Member]
Summary of Company's subsequent acquisitions of properties
Number of Buildings
Square feet
Purchase Price
Assumed Debt
Miami [Member]
Summary of Company's subsequent acquisitions of properties
Number of Buildings	2
Square feet	137,594
Purchase Price	12,350
Assumed Debt	6,100
Northern New Jersey/New York City [Member]
Summary of Company's subsequent acquisitions of properties
Number of Buildings
Square feet
Purchase Price
Assumed Debt
San Francisco Bay Area [Member]
Summary of Company's subsequent acquisitions of properties
Number of Buildings
Square feet
Purchase Price
Assumed Debt
Seattle [Member]
Summary of Company's subsequent acquisitions of properties
Number of Buildings
Square feet
Purchase Price
Assumed Debt
Washington, D.C./Baltimore [Member]
Summary of Company's subsequent acquisitions of properties
Number of Buildings	1
Square feet	65,697
Purchase Price	6,660
Assumed Debt	$ 3,600