Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Cash flows from operating activities
Net income	$ 211,172		$ 147,754
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	163,573		156,423
Gain on acquisition of controlling interest in joint ventures	0		(40,191)
Gain on sale of discontinued operations, net of tax	(91,059)		(32,541)
Gain on sale of land	(698)		0
Distributions of income from joint ventures	7,935		3,064
Equity in income of joint ventures	(20,658)	[1]	(4,686)	[1]
Share-based compensation	10,682		9,950
Amortization of deferred financing costs	2,689		2,721
Net change in operating accounts and other	25,968		7,501
Net cash from operating activities	309,604		249,995
Cash flows from investing activities
Development and capital improvements	(245,336)		(202,730)
Acquisition of operating properties, including joint venture interests, net of cash acquired	(224,109)		(305,258)
Proceeds from sale of land and discontinued operations	162,019		54,125
Investments in joint ventures	(1,126)		(6,706)
Distributions from investments in joint ventures	6,094		9,230
Increase in non-real estate assets	(15,103)		(2,918)
Change in restricted cash	(53,704)		(791)
Other	0		(3,395)
Net cash from investing activities	(371,265)		(458,443)
Cash flows from financing activities
Borrowings on unsecured line of credit and other short-term borrowings	450,900		79,000
Repayments on unsecured line of credit and other short-term borrowings	(267,900)		(45,000)
Repayment of notes payable	(29,217)		(345,592)
Proceeds from issuance of common shares	40,098		693,375
Distributions to common shareholders, perpetual preferred units and non-controlling interests	(163,290)		(138,641)
Redemption of perpetual preferred units	0		(100,000)
Payment of deferred financing costs	(827)		(757)
Common share options exercised	2,466		12,575
Net decrease in accounts receivable - affiliates	6,151		2,165
Other	1,318		1,754
Net cash from financing activities	39,699		158,879
Net decrease in cash and cash equivalents	(21,962)		(49,569)
Cash and cash equivalents, beginning of period	26,669		55,159
Cash and cash equivalents, end of period	4,707		5,590
Supplemental information
Cash paid for interest, net of interest capitalized	56,500		61,120
Cash paid for income taxes	2,116		1,548
Supplemental schedule of noncash investing and financing activities
Distributions declared but not paid	56,793		49,940
Value of shares issued under benefit plans, net of cancellations	20,555		21,226
Net change in redemption of non-qualified share awards	12,796		0
Conversion of operating partnership units to common shares	71		447
Accrual associated with construction and capital expenditures	21,502		14,428
Amount payable for purchase of non-controlling interest	0		10,241
Acquisition of operating properties, including joint venture interests:
Mortgage debt assumed	0		272,606
Other liabilities assumed	$ 0		$ 6,640

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