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Commitments and Contingencies (Details) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2013
Loss Contingencies [Line Items]
Operating partnership units, outstanding	298,170
Operating partnership units outstanding, fair value	$ 32.2

- Definition

The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners.

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