CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue:
Rental and other income	$ 500,840	$ 454,517	$ 1,007,814	$ 894,273
Management, development and other fees	1,467	2,942	2,990	5,553
Total revenue	502,307	457,459	1,010,804	899,826
Expenses:
Operating expenses, excluding property taxes	118,903	112,069	235,530	224,845
Property taxes	51,107	45,913	101,174	93,089
Interest expense, net	46,581	44,590	89,991	90,164
Loss (gain) on extinguishment of debt, net	2,461	(7,749)	2,461	(7,749)
Depreciation expense	132,469	118,627	259,685	235,480
General and administrative expense	12,011	10,335	23,414	20,803
Expensed acquisition, development and other pursuit costs, net of recoveries	1,436	673	4,897	1,860
Casualty and impairment (gain) loss, net	1,732	17,114	3,935	11,326
Total expenses	363,236	307,344	713,217	647,166
Equity in income of unconsolidated real estate entities	27,151	13,806	55,120	48,371
Gain on sale of other real estate	30,990	0	82,420	70,936
Gain on sale of communities	143	9,625	143	9,647
Income before taxes	197,355	173,546	435,270	381,614
Income tax expense	36	1,293	73	1,308
Net income	197,319	172,253	435,197	380,306
Net loss attributable to noncontrolling interests	125	71	180	163
Net income attributable to common stockholders	197,444	172,324	435,377	380,469
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	(26,788)	(6)	(74,545)	(36)
Other comprehensive income (loss):
Cash flow hedge losses reclassified to earnings	1,561	1,433	2,935	3,028
Comprehensive income	$ 172,217	$ 173,751	$ 363,767	$ 383,461
Earnings per common share - basic:
Net income attributable to common stockholders (in dollars per share)	$ 1.44	$ 1.30	$ 3.17	$ 2.88
Earnings per common share - diluted:
Net income attributable to common stockholders (in dollars per share)	1.44	1.29	3.17	2.86
Dividends per common share (in dollars per share)	$ 1.35	$ 1.25	$ 2.70	$ 2.50