Condensed Consolidated Statements of Operations (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Property rental	$ 64,300	$ 56,786	$ 125,790	$ 112,929
Management and franchise fees	6,144	5,653	12,111	11,205
Tenant reinsurance	7,596	6,338	14,620	12,230
Total revenues	78,040	68,777	152,521	136,364
Expenses:
Property operations	22,712	20,941	46,056	42,897
Tenant reinsurance	1,382	1,457	2,997	2,680
Unrecovered development and acquisition costs	1,570	142	1,819	212
General and administrative	12,432	11,229	24,090	22,285
Depreciation and amortization	14,092	12,202	27,677	24,621
Total expenses	52,188	45,971	102,639	92,695
Income from operations	25,852	22,806	49,882	43,669
Interest expense	(16,261)	(16,233)	(32,675)	(33,507)
Non-cash interest expense related to amortization of discount on exchangeable senior notes	(440)	(416)	(868)	(820)
Interest income	189	211	371	536
Interest income on note receivable from Preferred Operating Partnership unit holder	1,212	1,212	2,425	2,425
Income before equity in earnings of real estate ventures and income tax expense	10,552	7,580	19,135	12,303
Equity in earnings of real estate ventures	2,376	1,559	4,187	3,060
Income tax expense	(411)	(1,214)	(665)	(2,259)
Net income	12,517	7,925	22,657	13,104
Net income allocated to Preferred Operating Partnership noncontrolling interests	(1,552)	(1,507)	(3,084)	(2,986)
Net income allocated to Operating Partnership and other noncontrolling interests	(356)	(238)	(663)	(370)
Net income attributable to common stockholders	$ 10,609	$ 6,180	$ 18,910	$ 9,748
Net income per common share
Basic (in dollars per share)	$ 0.12	$ 0.07	$ 0.21	$ 0.11
Diluted (in dollars per share)	$ 0.12	$ 0.07	$ 0.21	$ 0.11
Weighted average number of shares
Basic (in shares)	91,439,042	87,367,967	89,733,518	87,122,064
Diluted (in shares)	96,010,848	92,304,831	94,336,141	92,026,150
Cash dividends paid per common share (in dollars per share)	$ 0.14	$ 0.10	$ 0.28	$ 0.20