Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Fair value adjustment on debt assumed	$ 704	$ 2,578
Cash flows from operating activities:
Consolidated net income	83,033	54,540
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Amortization and Accretion, Net	(20)	0
Depreciation and amortization	68,236	64,341
Stock compensation expense	1,171	1,231
Redeemable stock issued	377	285
Amortization of debt premium	(505)	(316)
Loss from investments in real estate joint ventures	(101)	98
Gain on debt extinguishment	169	(5)
Derivative interest expense	484	358
Gain on sale of discontinued operations	(43,121)	(22,382)
Gain (Loss) on Disposal of Discontinued Operation		22,453
Net casualty loss and other settlement proceeds	(451)	58
Changes in assets and liabilities:
Restricted cash	(279)	102
Other assets	(3,176)	(63)
Accounts payable	5,527	3,498
Accrued expenses and other	(2,239)	(1,118)
Security deposits	277	305
Net cash provided by operating activities	109,382	100,864
Cash flows from investing activities:
Purchases of real estate and other assets	(89,871)	(96,906)
Improvements to existing real estate assets	(22,494)	(26,380)
Construction Capital and Other Improvements	2,137	2,304
Renovations to Existing Real Estate Assets	5,112	6,896
Development	(20,816)	(42,592)
Distributions from real estate joint ventures	8,197	10,779
Contributions to real estate joint ventures	(183)	(73)
Proceeds from disposition of real estate assets	73,089	51,133
Funding of escrow for future acquisitions	11,902	0
Net cash used in investing activities	(71,229)	(113,239)
Cash flows from financing activities:
Net change in credit lines	2,000	(232,064)
Proceeds from notes payable	0	150,000
Principal payments on notes payable	(2,799)	(1,757)
Payment of deferred financing costs	(426)	(1,997)
Repurchase of common stock	(673)	(1,640)
Proceeds from issuances of common shares	24,968	120,148
Distributions to noncontrolling interests	(2,391)	(2,559)
Dividends paid on common shares	(59,115)	(52,732)
Net cash (used in) provided by financing activities	(38,436)	(22,601)
Net (decrease) increase in cash and cash equivalents	(283)	(34,976)
Cash and cash equivalents, beginning of period	9,075	57,317
Cash and cash equivalents, end of period	8,792	22,341
Supplemental disclosure of cash flow information:
Interest paid	33,610	30,441
Supplemental disclosure of noncash investing and financing activities:
Conversion of units to shares of common stock	444	2,516
Accrued construction in progress	7,126	6,818
Interest capitalized	872	1,289
Marked-to-market adjustment on derivative instruments	19,916	4,841
Loss on sale of non-depreciable assets, including discontinued operations	0	(3)
Notes Assumed	$ 18,293	$ 30,290