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Acquisitions and Dispositions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Trust Investment	Mar. 31, 2012
Acquisitions and Dispositions (Textual) [Abstract]
Number of limited partnerships	18
Number of business income trusts	2
Purchase of non-controlling interests	$ (1)	$ (22)

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Number of business income trusts.

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Number of limited partnerships.

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Purchase of non controlling interests.

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