Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Consolidated net income	$ 54,540	$ 16,835
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	64,341	57,318
Stock compensation expense	1,231	1,686
Redeemable stock issued	285	293
Amortization of debt premium	(316)	(180)
Loss from investments in real estate joint ventures	98	423
Gain on debt extinguishment	(5)	48
Derivative interest expense	358	222
Loss on sale of non-depreciable assets	(3)	(6)
Gain on sale of discontinued operations	(22,453)	0
Net casualty loss and other settlement proceeds	58	406
Changes in assets and liabilities:
Restricted cash	102	(113)
Other assets	(63)	1,943
Accounts payable	3,498	1,012
Accrued expenses and other	(1,118)	3,714
Security deposits	305	(62)
Net cash provided by operating activities	100,864	83,551
Cash flows from investing activities:
Purchases of real estate and other assets	(96,906)	(185,901)
Improvements to existing real estate assets	(26,380)	(22,798)
Construction capital and other improvements	(2,304)	(2,983)
Renovations to existing real estate assets	(6,896)	(6,005)
Development	(42,592)	(8,658)
Distributions from real estate joint ventures	10,779	828
Contributions to real estate joint ventures	(73)	(1,373)
Proceeds from disposition of real estate assets	51,133	320
Net cash used in investing activities	(113,239)	(226,570)
Cash flows from financing activities:
Net change in credit lines	(232,064)	(12,817)
Proceeds from notes payable	150,000	150,350
Principal payments on notes payable	(1,757)	(101,612)
Payment of deferred financing costs	(1,997)	(1,700)
Repurchase of common stock	(1,640)	(2,260)
Proceeds from issuances of common shares	120,148	125,737
Distributions to noncontrolling interests	(2,559)	(2,719)
Dividends paid on common shares	(52,732)	(45,064)
Net cash (used in) provided by financing activities	(22,601)	109,915
Net (decrease) increase in cash and cash equivalents	(34,976)	(33,104)
Cash and cash equivalents, beginning of period	57,317	45,942
Cash and cash equivalents, end of period	22,341	12,838
Supplemental disclosure of cash flow information:
Interest paid	30,441	28,034
Supplemental disclosure of noncash investing and financing activities:
Conversion of units to shares of common stock	2,516	2,878
Accrued construction in progress	6,818	6,775
Interest capitalized	1,289	459
Marked-to-market adjustment on derivative instruments	4,841	6,587
Reclassification of redeemable stock to liabilities	0	151
Fair value adjustment on debt assumed	2,578	0
Notes Assumed	$ 30,290	$ 0