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Significant Accounting Policies (Details) (USD $) |  | 1 Months Ended
--- | --- | ---
Dec. 31, 2011 entity | Sep. 30, 2006 Phoenix Tower | Dec. 31, 2007 East Wacker | May 31, 2009 Grand Boulevard
Significant Accounting Policies |  |  |  |
Number of corporations organized to operate as real estate investment trusts (REITs) | 16 |  |  |
Number of REITs in which the entity holds non-controlling preferred stock interest | 3 |  |  |
Sponsored REITs |  |  |  |
Preferred shares purchased |  | 48 | 965.75 | 175.5
Percentage of outstanding preferred shares purchased |  | 4.60% | 43.70% | 27.00%
Net cost of preferred shares purchased |  | $ 4,116,000 | $ 82,813,000 | $ 15,049,000

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- Definition Represents the percentage of the equity method investee's outstanding preferred stock purchased by the entity during the reporting period. + References No definition available. + Details
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