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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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