CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Rental and other income	$ 568,285	$ 529,414	$ 1,128,191	$ 1,050,539
Total revenue	569,239	530,512	1,130,032	1,052,837
Expenses:
Operating expenses, excluding property taxes	131,759	126,687	263,784	249,730
Property taxes	59,994	53,566	119,891	106,497
Interest expense, net	56,585	50,102	111,698	99,397
Loss on extinguishment of debt, net	642	24,162	1,039	24,162
Depreciation expense	156,685	141,439	315,743	282,060
General and administrative expense	14,444	13,947	28,108	27,153
Expensed acquisition, development and other pursuit costs, net of recoveries	889	570	1,689	1,298
Casualty and impairment (gain) loss, net	0	0	58	(11,688)
Total expenses	420,998	410,473	841,894	801,985
Income before equity in income of unconsolidated real estate entities, gain on sale of communities and other real estate, and income taxes	148,241	120,039	288,138	250,852
Equity in income of unconsolidated real estate entities	789	1,146	2,529	17,819
Gain on sale of communities	105,201	44,067	105,201	132,016
Gain on other real estate transactions, net	370	0	323	366
Income before income taxes	254,601	165,252	396,191	401,053
Income tax expense	58	58	58	78
Net income	254,543	165,194	396,133	400,975
Net loss attributable to noncontrolling interests	119	31	172	125
Net income attributable to common stockholders	254,662	165,225	396,305	401,100
Other comprehensive income:
(Loss) gain on cash flow hedges	0	(16,158)	11,499	(16,013)
Cash flow hedge losses reclassified to earnings	1,455	1,781	3,213	3,534
Comprehensive income	$ 256,117	$ 150,848	$ 411,017	$ 388,621
Earnings per common share - basic:
Net income attributable to common stockholders (in dollars per share)	$ 1.84	$ 1.20	$ 2.87	$ 2.91
Earnings per common share - diluted:
Net income attributable to common stockholders (in dollars per share)	1.84	1.20	2.87	2.91
Dividends per common share (in dollars per share)	$ 1.47	$ 1.42	$ 2.94	$ 2.84
Management, development and other fees
Revenue:
Management, development and other fees	$ 954	$ 1,098	$ 1,841	$ 2,298