CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests in Consolidated Real Estate Affiliates
Balance at Dec. 31, 2010	$ 10,181,749	$ 9,419	$ 10,681,586	$ (612,075)	$ 172	$ 102,647
Increase (Decrease) in Shareholders' Equity
Net loss	(198,402)			(197,384)		(1,018)
Distributions to noncontrolling interests in consolidated Real Estate Affiliates	(3,808)					(3,808)
Issuance of common stock - payment of dividend (22,256,121 common shares)		223	(244)	21
Restricted stock grant, net of forfeitures and compensation expense (22,397 and (161,495) common shares for the six months ended June 30, 2012 and 2011, respectively)	5,647	(2)	5,649
Stock options exercised (11,235 and 97,987 common shares for the six months ended June 30, 2012 and 2011, respectively)	489	1	488
Purchase and cancellation of common shares ((30,585,957) common shares)	(487,846)	(306)	(341,339)	(146,201)
Cash dividends reinvested (DRIP) in stock (2,582,327 and 2,745,881 common shares for the six months ended June 30, 2012 and 2011, respectively)	45,760	27	45,733
Other comprehensive income (loss)	42,583				42,583
Cash distributions declared ($0.20 per share)	(190,017)			(190,017)
Cash redemptions for common units in excess of carrying value	(593)		(593)
Adjustment for noncontrolling interest in operating partnership	(10,085)		(10,085)
Balance at Jun. 30, 2011	9,385,477	9,362	10,381,195	(1,145,656)	42,755	97,821
Balance at Dec. 31, 2011	8,579,345	9,353	10,405,318	(1,883,569)	(47,773)	96,016
Increase (Decrease) in Shareholders' Equity
Net loss	(306,210)			(305,548)		(662)
Distributions to noncontrolling interests in consolidated Real Estate Affiliates	(6,484)					(6,484)
Restricted stock grant, net of forfeitures and compensation expense (22,397 and (161,495) common shares for the six months ended June 30, 2012 and 2011, respectively)	4,281		4,281
Employee stock purchase program (99,533 common shares)	1,607	1	1,606
Stock options exercised (11,235 and 97,987 common shares for the six months ended June 30, 2012 and 2011, respectively)	740		740
Cash dividends reinvested (DRIP) in stock (2,582,327 and 2,745,881 common shares for the six months ended June 30, 2012 and 2011, respectively)	38,704	26	38,678
Other comprehensive income (loss)	(34,012)				(34,012)
Cash distributions declared ($0.20 per share)	(187,555)			(187,555)
Adjustment for noncontrolling interest in operating partnership	(28,955)		(28,955)
Adjustment to dividend for RPI Spin-Off	26,044			26,044
Balance at Jun. 30, 2012	$ 8,087,505	$ 9,380	$ 10,421,668	$ (2,350,628)	$ (81,785)	$ 88,870