Investments In Unconsolidated Real Estate Entities (Schedule Of Operation - Mixed-Use LP) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			9 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Sep. 24, 2010 Mixed-Use LP [Member]	Dec. 31, 2009 Mixed-Use LP [Member]
Real Estate Properties [Line Items]
Rental and other revenues				$ (90)
Property operating and maintenance				402	653
Depreciation and amortization				1,071
Interest				175
Impairment charges					71,679
Total expenses				1,648	72,332
Gain on distribution of assets / liabilities at fair value				20,049
Net income (loss)				18,491	(72,332)
Company's share of net income (loss)	$ 1,001	$ 18,739	$ (74,447)	$ 18,104	$ (74,979)