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Non-controlling Interests (Details Textual) (USD $)	12 Months Ended				1 Months Ended			12 Months Ended
Non-controlling Interests (Details Textual) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Westheimer [Member]	Mar. 29, 2012 Deer Valley Operating Property [Member]	Jun. 30, 2012 One East/Erie Ontario Operating Property [Member]	May 31, 2012 One East/Erie Ontario Operating Property [Member]	Dec. 31, 2012 Houston, Texas Operating Property [Member]	Dec. 31, 2012 Houston, Texas Operating Property [Member] Westheimer [Member] Units
Non-controlling Interests (Textual) [Abstract]
Percentage of non-controlling ownership interest				30.00%	3.50%		20.00%	22.00%
Investment in equity investments	$ 78,679,000	$ 151,219,000	$ 25,632,000		$ 400,000	$ 5,850,000		$ 1,650,000
Purchase price accounting, carrying value of the acquired non-controlling interest	26,856,000				192,000		363,000	2,812,000
Purchase price accounting, reduction in paid-in capital					$ 208,000		$ 5,487,000	$ 1,162,000
Trust acquired additional limited partnership									5.5

The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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