CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue:
Rental and other income	$ 2,291,766	$ 2,297,442	$ 2,319,666
Management, development and other fees	3,084	3,819	4,960
Total revenue	2,294,850	2,301,261	2,324,626
Expenses:
Operating expenses, excluding property taxes	570,853	549,913	515,145
Property taxes	283,089	273,189	252,961
Expensed transaction, development and other pursuit costs, net of recoveries	3,231	12,399	4,991
Interest expense, net	220,415	214,151	203,585
Loss on extinguishment of debt, net	17,787	9,333	602
Depreciation expense	758,596	707,331	661,578
General and administrative expense	69,611	60,343	58,042
Casualty and impairment loss	3,119	0	0
Total expenses	1,926,701	1,826,659	1,696,904
Income from investments in unconsolidated entities	38,585	6,422	8,652
Gain on sale of communities	602,235	340,444	166,105
Gain on other real estate transactions, net	2,097	440	439
Net for-sale condominium activity	(977)	2,551	(3,812)
Income before income taxes	1,010,089	824,459	799,106
Income tax (expense) benefit	(5,733)	3,247	(13,003)
Net income	1,004,356	827,706	786,103
Net income attributable to noncontrolling interests	(57)	(76)	(129)
Net income attributable to common stockholders	1,004,299	827,630	785,974
Other comprehensive income (loss):
Gain (loss) on cash flow hedges	993	(17,731)	(11,930)
Cash flow hedge losses reclassified to earnings	(13,151)	(8,984)	(6,571)
Comprehensive income	$ 1,018,443	$ 818,883	$ 780,615
Earnings per common share - basic:
Net income per common share - basic (in dollars per share)	$ 7.19	$ 5.89	$ 5.64
Earnings per common share - diluted:
Net income per common share - diluted (in dollars per share)	$ 7.19	$ 5.89	$ 5.63