CONSOLIDATED STATEMENTS OF EQUITY (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	2,116		19	1,838		788		(529)
Issuance of common shares for cash offering	418,522		3,150	412,629				2,743
Issuance of restricted stock	733		94	(2,297)				2,936
Vesting of restricted stock	(2,195)			1,566		(628)		(3,133)
Stock-based compensation	2,118			2,118
Issuance of preferred shares	192,855	200,000		(7,145)
Redemption of preferred shares	(170,000)	(170,000)		5,804	(5,804)
Contributions from non-controlling interests	249								249
Distributions to non-controlling interests	(8,790)								(8,790)
Dividends declared-common shares	(103,972)				(103,972)
Dividends declared-preferred shares	(21,661)				(21,661)
Comprehensive (loss) income	(51,911)				(25,818)		(26,940)		847
Balance at Sep. 30, 2012	$ 3,335,956	$ 405,000	$ 30,974	$ 4,553,325	$ (1,650,608)	$ 14,094	$ (28,343)	$ (13,000)	$ 24,514