Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues:
Rental and other property	$ 125,474	$ 111,208
Management and other fees from affiliates	2,444	1,224
Total revenues	127,918	112,432
Expenses:
Property operating, excluding real estate taxes	28,751	27,837
Real estate taxes	11,413	10,587
Depreciation	40,734	36,658
General and administrative	5,400	5,274
Owned Property Management Costs	1,640	925
Total expenses	87,938	81,281
Earnings from operations	39,980	31,151
Interest expense before amortization	(24,658)	(21,811)
Amortization expense	(2,871)	(2,851)
Interest and other income	2,413	6,987
Equity income (loss) from co-investments	2,340	(1,373)
Income before discontinued operations	17,204	12,103
Income from discontinued operations	10,037	404
Net income	27,241	12,507
Net income attributable to noncontrolling interest	(3,151)	(3,546)
Net income attributable to controlling interest	24,090	8,961
Dividends to preferred stockholders	(1,368)	(543)
Net income available to common stockholders	22,722	8,418
Comprehensive Income	29,592	11,898
Comprehensive income attributable to noncontrolling interest	(3,296)	(3,505)
Comprehensive income attributable to controlling interest	$ 26,296	$ 8,393
Basic:
Income from continuing operations (in dollars per share)	$ 0.39	$ 0.25
Income from discontinued operations (in dollars per share)	$ 0.28	$ 0.02
Net income available to common stockholders (in dollars per share)	$ 0.67	$ 0.27
Weighted average number of shares outstanding during the period (in shares)	34,027,890	31,465,817
Diluted:
Income from continuing operations (in dollars per share)	$ 0.39	$ 0.25
Income from discontinued operations (in dollars per share)	$ 0.28	$ 0.02
Net income available to common stockholders (in dollars per share)	$ 0.67	$ 0.27
Weighted average number of shares outstanding during the period (in shares)	34,151,475	31,546,953
Dividends per common share (in dollars per share)	$ 1.10	$ 1.04