Consolidated Statements of Changes in Equity (USD $) In Thousands, unless otherwise specified	Total	$0.4875 per Series A preferred share	$0.50 per Series C depositary preferred share	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit	Accumulated Deficit $0.4875 per Series A preferred share	Accumulated Deficit $0.50 per Series C depositary preferred share	Treasury Stock	Noncontrolling Interests in Other Parnerhsips	Comprehensive Loss
Stockholders' Equity, beginning balance at Dec. 31, 2010	$ 588,378			$ 478,774	$ 1,010	$ 2,190,308	$ 26,457	$ (2,054,625)			$ (73,341)	$ 19,795
Shares, Issued - beginning balance at Dec. 31, 2010				12,948	101,038
Increase (Decrease) in Stockholders' Equity
Retirement of treasury stock - shares					(4,156)
Retirement of treasury shares - value					(41)			(73,300)			73,341
Amortization of stock awards	827					827
Forfeiture of stock awards - shares					(10)
Forfeiture of stock awards - value	(75)					0		(75)			0
Allocation to redeemable noncontrolling interests	143					143
Contribution from noncontrolling interests	64											64
Distribution to noncontrolling interests	(445)											(445)
Other	(2)					0		(2)				0
Preferred dividends:
Preferred dividends		(6,279)	(3,399)						(6,279)	(3,399)
Comprehensive Loss:
Foreign exchange translation							1,288						1,288
Net loss								(31,664)				58	(31,606)
Comprehensive loss	(30,318)												(30,318)
Stockholders' Equity, ending balance at Mar. 31, 2011	548,894			478,774	969	2,191,278	27,745	(2,169,344)			0	19,472
Shares, Issued - ending balance at Mar. 31, 2011				12,948	96,872
Stockholders' Equity, beginning balance at Dec. 31, 2011	586,895			478,774	1,243	2,353,251	25,738	(2,297,468)			0	25,357
Shares, Issued - beginning balance at Dec. 31, 2011				12,948	124,281
Increase (Decrease) in Stockholders' Equity
Amortization of stock awards	232					232
Forfeiture of stock awards - shares					(63)
Forfeiture of stock awards - value	(7)				(1)	193		(199)
Conversion of operating partnership units into common shares - shares					0
Conversion of operating partnership units into common shares - value	1					1
Allocation to redeemable noncontrolling interests	(230)					(230)
Contribution from noncontrolling interests	291											291
Distribution to noncontrolling interests	(455)											(455)
Other	(4)					0		(4)
Preferred dividends:
Preferred dividends		(6,279)	(3,399)						(6,279)	(3,399)
Comprehensive Loss:
Foreign exchange translation							306						306
Net loss								(28,463)				(202)	(28,665)
Comprehensive loss	(28,359)												(28,359)
Stockholders' Equity, ending balance at Mar. 31, 2012	$ 548,686			$ 478,774	$ 1,242	$ 2,353,447	$ 26,044	$ (2,335,812)			$ 0	$ 24,991
Shares, Issued - ending balance at Mar. 31, 2012				12,948	124,218