Noncontrolling Interests (Effect Of Changes In Ownership Interest In Subsidiaries On Consolidated Equity) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Noncontrolling Interest [Line Items]
Net (loss) income adjusted for noncontrolling interests	$ (33,220,000)	$ 17,529,000	$ (15,421,000)	$ 39,940,000
Net increase (decrease) in equity for the acquisition of noncontrolling interests			1,668,000	(879,000)
Change from net (loss) income adjusted for noncontrolling interests and transfers from the noncontrolling interests			(13,753,000)	39,807,000
Noncontrolling Interests [Member]
Noncontrolling Interest [Line Items]
Increase in equity for operating partnership units			$ 0	$ 746,000