CONSOLIDATED STATEMENT OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Total Stockholders' Equity	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Noncontrolling Interests
Balance at Dec. 31, 2011	$ 3,164,651	$ 2,813,337	$ 1,321	$ 3,490,647	$ (678,631)	$ 351,314
Balance (in shares) at Dec. 31, 2011			132,153,444
Increase (Decrease) in Stockholders' Equity
Net income	132,819	119,286			119,286	13,533
Amortization of share and unit-based plans	7,282	7,282	6	7,276
Amortization of share and unit-based plans (in shares)			556,435
Exercise of stock warrants	(3,448)	(3,448)		(3,448)
Employee stock purchases	425	425		425
Employee stock purchases (in shares)			9,723
Distributions paid ($1.10) per share	(145,947)	(145,947)			(145,947)
Distributions to noncontrolling interests	(18,237)					(18,237)
Contributions from noncontrolling interests	1,002					1,002
Other	(754)	(754)		(754)
Conversion of noncontrolling interests to common shares		11,276	6	11,270		(11,276)
Conversion of noncontrolling interests to common shares (in shares)			564,142
Redemption of noncontrolling interests	(15)	(10)		(10)		(5)
Adjustment of noncontrolling interest in Operating Partnership		(5,189)		(5,189)		5,189
Balance at Jun. 30, 2012	$ 3,137,778	$ 2,796,258	$ 1,333	$ 3,500,217	$ (705,292)	$ 341,520
Balance (in shares) at Jun. 30, 2012			133,283,744