CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Rental and other income	$ 575,070	$ 549,507	$ 1,703,263	$ 1,600,047
Total revenue	575,982	550,500	1,706,015	1,603,337
Expenses:
Operating expenses, excluding property taxes	132,918	129,590	396,703	379,319
Property taxes	61,230	57,698	181,120	164,195
Interest expense, net	54,097	47,741	165,795	147,138
Loss on extinguishment of debt, net	1,678	0	2,717	24,162
Depreciation expense	156,538	144,990	472,282	427,050
General and administrative expense	13,905	11,655	42,013	38,808
Expensed transaction, development and other pursuit costs, net of recoveries	1,020	789	2,709	2,087
Casualty and impairment (gain) loss, net	554	0	612	(11,688)
Total expenses	420,832	392,463	1,262,727	1,194,447
Income before equity in income of unconsolidated real estate entities, gain (loss) on sale of communities and other real estate, and income taxes	155,150	158,037	443,288	408,890
Equity in income of unconsolidated real estate entities	10,031	52,568	12,560	70,386
Gain on sale of communities	27,243	27,738	132,444	159,754
Gain (loss) on other real estate transactions, net	12	(120)	335	246
Income before income taxes	192,436	238,223	588,627	639,276
Income tax expense	29	24	87	102
Net income	192,407	238,199	588,540	639,174
Net loss attributable to noncontrolling interests	79	49	251	174
Net income attributable to common stockholders	192,486	238,248	588,791	639,348
Other comprehensive income (loss):
Gain (loss) on cash flow hedges	0	359	11,499	(15,654)
Cash flow hedge losses reclassified to earnings	1,466	1,767	4,679	5,301
Comprehensive income	$ 193,952	$ 240,374	$ 604,969	$ 628,995
Earnings per common share - basic:
Net income attributable to common stockholders (in dollars per share)	$ 1.39	$ 1.73	$ 4.26	$ 4.64
Earnings per common share - diluted:
Net income attributable to common stockholders (in dollars per share)	1.39	1.72	4.26	4.63
Dividends per common share (in dollars per share)	$ 1.47	$ 1.42	$ 4.41	$ 4.26
Management, development and other fees
Revenue:
Management, development and other fees	$ 912	$ 993	$ 2,752	$ 3,290