Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING ACTIVITIES
Net income	$ 35,842	$ 44,122
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization, including discontinued operations	40,624	36,571
Gain On Sale Of Real Estate in Real Estate Partnership	0	(11,860)
Income from real estate partnerships	(312)	(301)
Other, net	(61)	2,121
Changes in assets and liabilities, net of effects of acquisitions and dispositions
(Increase) decrease in accounts receivable	(2,458)	740
Increase in prepaid expenses and other assets	(93)	(398)
Increase (decrease) in accounts payable and accrued expenses	1,435	(1,734)
(Decrease) increase in security deposits and other liabilities	(7,284)	196
Net cash provided by operating activities	67,693	69,457
INVESTING ACTIVITIES
Capital expenditures - development and redevelopment	(33,367)	(24,081)
Capital expenditures - other	(9,460)	(12,958)
Distribution from real estate partnership in excess of earnings	0	143
Leasing costs	(2,723)	(2,243)
Issuance of mortgage and other notes receivable, net	(125)	(143)
Net cash used in investing activities	(45,675)	(39,282)
FINANCING ACTIVITIES
Repayment of mortgages, capital leases and notes payable	(12,095)	(3,292)
Issuance of common shares	32,542	22,402
Dividends paid to common and preferred shareholders	(46,884)	(43,497)
Distributions to and redemptions of noncontrolling interests	(1,295)	(4,412)
Net cash used in financing activities	(27,732)	(28,799)
(Decrease) increase in cash and cash equivalents	(5,714)	1,376
Cash and cash equivalents at beginning of year	36,988	67,806
Cash and cash equivalents at end of period	$ 31,274	$ 69,182