Consolidated Statement of Equity (Unaudited) (USD $) In Thousands	Total	Preferred Shares	Common Shares	Paid-in Capital	Accumulated Distributions in Excess of Net Income (Loss)	Deferred Compensation Obligation	Accumulated Other Comprehensive Income (Loss)	Treasury Stock at Cost	Non-Controlling Interests
Balance at Dec. 31, 2011	$ 3,077,892	$ 375,000	$ 27,711	$ 4,138,812	$ (1,493,353)	$ 13,934	$ (1,403)	$ (15,017)	$ 32,208
Issuance of common shares related to stock plans	575		7	309		151		108
Issuance of restricted stock	721		38	(2,237)				2,920
Vesting of restricted stock	(429)			1,542		(711)		(1,260)
Stock-based compensation	698			698
Contributions from non-controlling interests	93								93
Distributions to non-controlling interests	(6,570)								(6,570)
Dividends declared-common shares	(33,301)				(33,301)
Dividends declared-preferred shares	(6,967)				(6,967)
Comprehensive loss	(9,435)				(15,057)		5,123		499
Balance at Mar. 31, 2012	$ 3,023,277	$ 375,000	$ 27,756	$ 4,139,124	$ (1,548,678)	$ 13,374	$ 3,720	$ (13,249)	$ 26,230