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Noncontrolling Interests (Effect of Changes in Ownership Interest in Subsidiaries) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Noncontrolling Interests
Net income attributable to common shareholders	$ (16,597)	$ 2,134	$ (9,311)	$ 4,419
Increase in equity for conversion of operating partnership units			592	1,337
Change in common equity and net transfers from noncontrolling interests			$ (8,719)	$ 5,756

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- Definition

Change in common shareholders' equity and net transfers from noncontrolling interests.

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- Definition

Value of stock issued during the period upon the conversion of units.

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- Definition

Net income after adjustments for income allocated to preferred units and/or income allocated to noncontrolling interest holders.

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- Definition

Noncontrolling interests.

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