Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Net Difference of Investment in Unconsolidated Affiliates and the Equity of Unconsolidated Affiliates	$ 4,994	$ 20,041
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	88,436	75,120
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	198,700	211,582
Net amortization of deferred finance costs and debt premiums	5,563	8,143
Net amortization of intangible lease assets and liabilities	(551)	(1,179)
Gain on sales of real estate assets	4,789	3,602
Gain on sale of discontinued operations	(983)	(121)
Write-off of development projects	(115)	51
Share-based compensation expense	2,211	1,769
Net realized (gain) loss on sale of available-for-sale securities	(160)	22
Write down of mortgage and other notes receivable	0	1,900
Loss on impairment of real estate	21,654	51,304
Loss on impairment of real estate from discontinued operations	8,759	6,696
Gain on extinguishment of debt	(178)	(581)
Gain on extinguishment of debt from discontinued operations	0	(31,434)
Equity in earnings of unconsolidated affiliates	(5,401)	(4,222)
Distributions of earnings from unconsolidated affiliates	11,724	6,171
Provision for doubtful accounts	1,310	1,999
Change in deferred tax accounts	3,681	(5,032)
Changes in:
Tenant and other receivables	(7,374)	(3,908)
Other assets	(3,152)	552
Accounts payable and accrued liabilities	284	2,905
Net cash provided by operating activities	319,619	318,135
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to real estate assets	(159,414)	(149,321)
Acquisition of real estate assets	(61,289)	(12,172)
Additions to restricted cash	(2,595)	(13,571)
Proceeds from sales of real estate assets	49,366	20,495
Additions to mortgage and other notes receivable	(3,584)	(5,300)
Payments received on mortgage and other notes receivable	2,962	4,817
Distributions in excess of equity in earnings of unconsolidated affiliates	17,620	13,094
Changes in other assets	(1,759)	(10,770)
Net cash used in investing activities	(163,687)	(172,769)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from mortgage and other indebtedness	1,348,822	1,373,265
Principal payments on mortgage and other indebtedness	(1,311,827)	(1,315,890)
Additions to deferred financing costs	(2,864)	(16,154)
Proceeds from issuances of common stock	128	136
Costs of preferred stock offering	(134)	0
Proceeds from exercises of stock options	4,434	1,955
Purchase of noncontrolling interest in the Operating Partnership	(9,836)	0
Contributions from noncontrolling interests	5,559	1,040
Distributions to noncontrolling interests	(49,437)	(55,033)
Dividends paid to holders of preferred stock	(31,782)	(31,782)
Dividends paid to common shareholders	(98,737)	(91,887)
Net cash used in financing activities	(145,674)	(134,350)
NET CHANGE IN CASH AND CASH EQUIVALENTS	10,258	11,016
CASH AND CASH EQUIVALENTS, beginning of period	56,092	50,896
CASH AND CASH EQUIVALENTS, end of period	66,350	61,912
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	$ 175,610	$ 202,097