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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

X

- 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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X

- Definition

The number of preferred stock purchased in the investee accounted for under the equity method of accounting.

+ References

No definition available.

+ Details

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X

- Definition

Represents the cost of preferred stock purchased in the investee accounted for under the equity method of accounting, net of commission and fees paid.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of entities in which the reporting entity has a non-controlling common stock interest.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of entities in which the reporting entity has a non-controlling preferred stock interest.

+ References

No definition available.

+ Details

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