Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Cash flows from operating activities
Net income	$ 93,104		$ 9,601
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization, including discontinued operations	50,304		46,593
Gain on acquisition of controlling interest in joint ventures	(40,191)		0
Gain on sale of discontinued operations, net of tax	(32,541)		0
Gain on sale of unconsolidated joint venture interests	0		(1,136)
Gain on sale of available-for sale investment	0		(4,301)
Distributions of income from joint ventures	1,024		1,321
Equity in income of joint ventures	(366)	[1]	(374)	[1]
Share-based compensation	3,005		2,777
Amortization of deferred financing costs	912		1,527
Net change in operating accounts and other	528		(1,601)
Net cash from operating activities	75,779		54,407
Cash flows from investing activities
Development and capital improvements	(60,269)		(23,141)
Acquisition of joint venture interests, net of cash acquired	(96,106)		0
Proceeds from sale of discontinued operations	54,125		0
Proceeds from sale of joint venture interests	0		19,310
Proceeds from sale of available-for-sale investment	0		4,510
Decrease in notes receivable - affiliates	0		3,279
Investments in joint ventures	(5,656)		(12,320)
Distributions of investments from joint ventures	2,620		1,208
Other	(183)		(622)
Net cash from investing activities	(105,469)		(7,776)
Cash flows from financing activities
Borrowings on unsecured line of credit	43,000		0
Repayments on unsecured line of credit	(43,000)		0
Repayment of notes payable	(273,809)		(89,128)
Proceeds from issuance of common shares	435,911		3,795
Redemption of perpetual preferred units	(100,000)		0
Distributions to common shareholders, perpetual preferred units and noncontrolling interests	(41,264)		(35,300)
Payment of deferred financing costs	(222)		(1,001)
Net decrease in accounts receivable - affiliates	1,294		1,922
Other	2,323		1,277
Net cash from financing activities	24,233		(118,435)
Net decrease in cash and cash equivalents	(5,457)		(71,804)
Cash and cash equivalents, beginning of period	55,159		170,575
Cash and cash equivalents, end of period	49,702		98,771
Supplemental information
Cash paid for interest, net of interest capitalized	8,633		19,352
Cash paid for income taxes	12		541
Distributions declared but not paid	47,594		38,662
Value of shares issued under benefit plans, net of cancellations	20,055		18,146
Conversion of operating partnership units to common shares	448		4
Accrual associated with construction and capital expenditures	12,504		4,987
Acquisition of joint venture interests, net of cash acquired, at fair value:
Assets acquired	399,306		0
Mortgage debt assumed	272,606		0
Other liabilities assumed	$ 4,621		$ 0

[1] Equity in income excludes our ownership interest of fee income from various property management services provided by us to our joint ventures.