Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Fair value adjustment on debt assumed	$ 704	$ 2,578
Cash flows from operating activities:
Consolidated net income	129,089	86,618
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Amortization and Accretion, Net	(29)	0
Depreciation and amortization	102,158	97,691
Stock compensation expense	1,729	1,730
Redeemable stock issued	535	428
Amortization of debt premium	(948)	(541)
Loss from investments in real estate joint ventures	(161)
Income (Loss) from Equity Method Investments	161	(170)
Gain on debt extinguishment	387	(5)
Losses on Debt Extinguishment		(322)
Derivative interest expense	827	590
Gain on sale of discontinued operations	(71,909)	(38,474)
Net casualty loss and other settlement proceeds	(450)	(19)
Changes in assets and liabilities:
Restricted cash	(391)	63
Other assets	(7,611)	(4,569)
Accounts payable	2,377	3,572
Accrued expenses and other	12,951	10,040
Security deposits	223	445
Net cash provided by operating activities	168,777	158,021
Cash flows from investing activities:
Purchases of real estate and other assets	(89,866)	(314,909)
Improvements to existing real estate assets	(35,412)	(36,989)
Construction Capital and Other Improvements	3,873	2,561
Renovations to Existing Real Estate Assets	8,616	11,070
Development	(26,129)	(54,242)
Distributions from real estate joint ventures	8,311	11,880
Contributions to real estate joint ventures	(183)	(204)
Proceeds from disposition of real estate assets	118,783	97,113
Funding of escrow for future acquisitions	(57,380)	0
Net cash used in investing activities	(94,365)	(310,982)
Cash flows from financing activities:
Net change in credit lines	177,000	(235,064)
Proceeds from notes payable	0	271,000
Principal payments on notes payable	(8,695)	(11,760)
Payment of deferred financing costs	(2,655)	(3,577)
Repurchase of common stock	(682)	(1,863)
Proceeds from issuances of common shares	25,038	173,960
Distributions to noncontrolling interests	(3,574)	(3,775)
Dividends paid on common shares	(88,814)	(79,855)
Net cash (used in) provided by financing activities	97,618	109,066
Net (decrease) increase in cash and cash equivalents	172,030	(43,895)
Cash and cash equivalents, beginning of period	9,075	57,317
Cash and cash equivalents, end of period	181,105	13,422
Supplemental disclosure of cash flow information:
Interest paid	48,534	47,735
Supplemental disclosure of noncash investing and financing activities:
Conversion of units to shares of common stock	550	2,672
Accrued construction in progress	4,190	6,392
Interest capitalized	1,118	1,844
Marked-to-market adjustment on derivative instruments	21,367	6,521
Gain on Sale of Non-Depreciable Assets, Including Discontinued Operations	0	45
Notes Assumed	$ 18,293	$ 30,290