Significant Accounting Policies - Inv in non-consolidated REITs (Details) - USD ($)			1 Months Ended
	May 29, 2009	Dec. 27, 2007	May 31, 2009	Dec. 31, 2007
East Wacker
Investment in Sponsored REITs
Preferred shares purchased		965.75		965.75
Percentage of outstanding preferred shares purchased		43.70%		43.70%
Net cost of preferred shares purchased		$ 82,813,000		$ 82,813,000
Grand Boulevard
Investment in Sponsored REITs
Preferred shares purchased	175.5		175.5
Percentage of outstanding preferred shares purchased	27.00%		27.00%
Net cost of preferred shares purchased	$ 15,049,000		$ 15,049,000