Net Income (Loss) Per Common Share Reconciling the Components of Basic and Diluted Net Income (Loss) per Common Share (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss) attributable to common shareholders/unitholders	$ (28,230)	$ (32,076)	$ (93,102)	$ (13,549)
Less: Dividends on Participating Securities	(680)	(811)	(2,388)	(2,416)
Basic Net Income (Loss) Attributable To Common Stockholders	(28,910)	(32,887)	(95,490)	(15,965)
Net Income (Loss) Attributable to Noncontrolling Interest, Operating Partnerships	0	0	0	0
Diluted Net Income (Loss) Attributable to Common Stockholders	(28,910)	(32,887)	(95,490)	(15,965)
Weighted average number of common shares/units outstanding	270,289	252,802	265,153	252,618
Weighted Average Limited Partnership Units Outstanding	0	0	0	0
Other potential dilutive shares/units	0	0	0	0
Weighted average number of common shares/units and potential dilutive securities	270,289	252,802	265,153	252,618
Subsidiary of Common Parent [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss) attributable to common shareholders/unitholders	(28,689)	(32,944)	(94,838)	(13,918)
Less: Dividends on Participating Securities	(680)	(811)	(2,388)	(2,416)
Basic Net Income (Loss) Attributable To Common Stockholders	$ (29,369)	$ (33,755)	$ (97,226)	$ (16,334)
Weighted average number of common shares/units outstanding	274,800	259,866	270,095	259,505
Other potential dilutive shares/units	0	0	0	0
Weighted average number of common shares/units and potential dilutive securities	274,800	259,866	270,095	259,505