CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Revenue:
Rental and other income	$ 439,756		$ 396,998
Management, development and other fees	2,611		3,077
Total revenue	442,367		400,075
Expenses:
Operating expenses, excluding property taxes	112,662		98,542
Property taxes	47,177		44,485
Interest expense, net	45,573	[1]	42,533	[1]
Depreciation expense	116,853	[1]	106,367	[1]
General and administrative expense	10,598		9,236
Expensed Acquisition, Development And Other Pursuit Costs, Net of Recoveries	1,187		715
Impairment of Real Estate	5,788		0
Total expenses	339,838		301,878
Equity in income of unconsolidated real estate entities	34,566		5,223
Gain on sale of land	22		0
Gain on sale of communities	70,936		0
Income (loss) from continuing operations	208,053		103,420
Discontinued operations:
Income from discontinued operations	0		310
Gain on sale of discontinued operations	0		37,869
Total discontinued operations	0		38,179
Net income	208,053		141,599
Net loss attributable to noncontrolling interests	91		140
Net income attributable to common stockholders	208,144		141,739
Other comprehensive income:
Cash flow hedge losses reclassified to earnings	1,565		1,573
Comprehensive income	$ 209,709		$ 143,312
Earnings per common share - basic:
Income (loss) from continuing operations attributable to common stockholders (in dollars per share)	$ 1.57		$ 0.80
Discontinued operations attributable to common stockholders (in dollars per share)	$ 0.00		$ 0.29
Net income attributable to common stockholders (in dollars per share)	$ 1.57		$ 1.09
Earnings per common share - diluted:
Income (loss) from continuing operations attributable to common stockholders (in dollars per share)	$ 1.56		$ 0.80
Discontinued operations attributable to common stockholders (in dollars per share)	$ 0.00		$ 0.29
Net income attributable to common stockholders (in dollars per share)	$ 1.56		$ 1.09
Dividends per common share: (in dollars per share)	$ 1.25		$ 1.16

[1] Includes amounts associated with assets sold or held for sale, not classified as discontinued operations.