CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Cumulative Dividends In Excess Of Earnings	Accumulated Other Comprehensive Income (Loss)	Total Stockholders’ Equity	Total Noncontrolling Interests	Cumulative Effect, Period of Adoption, Adjustment		Cumulative Effect, Period of Adoption, Adjustment Cumulative Dividends In Excess Of Earnings		Cumulative Effect, Period of Adoption, Adjustment Total Stockholders’ Equity		Cumulative Effect, Period of Adoption, Adjusted Balance	Cumulative Effect, Period of Adoption, Adjusted Balance Common Stock	Cumulative Effect, Period of Adoption, Adjusted Balance Additional Paid-In Capital	Cumulative Effect, Period of Adoption, Adjusted Balance Cumulative Dividends In Excess Of Earnings	Cumulative Effect, Period of Adoption, Adjusted Balance Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjusted Balance Total Stockholders’ Equity	Cumulative Effect, Period of Adoption, Adjusted Balance Total Noncontrolling Interests
Balance (in shares) at Dec. 31, 2018		477,496													477,496
Balance at Dec. 31, 2018	$ 6,512,591	$ 477,496	$ 8,398,847	$ (2,927,196)	$ (4,708)	$ 5,944,439	$ 568,152	$ 590	[1]	$ 590	[1]	$ 590	[1]	$ 6,513,181	$ 477,496	$ 8,398,847	$ (2,926,606)	$ (4,708)	$ 5,945,029	$ 568,152
Increase (Decrease) in Stockholders' Equity
Net income (loss)	12,702			2,010		2,010	10,692
Other comprehensive income (loss)	(515)				(515)	(515)
Issuance of common stock, net (in shares)		17,272
Issuance of common stock, net	509,242	$ 17,272	491,970			509,242
Conversion of DownREIT units to common stock (in shares)		184
Conversion of DownREIT units to common stock	0	$ 184	3,890			4,074	(4,074)
Repurchase of common stock (in shares)		(159)
Repurchase of common stock	(4,931)	$ (159)	(4,772)			(4,931)
Exercise of stock options (in shares)		55
Exercise of stock options	1,435	$ 55	1,380			1,435
Amortization of deferred compensation	14,529		14,529			14,529
Common dividends	(536,660)			(536,660)		(536,660)
Distributions to noncontrolling interests	(17,724)						(17,724)
Issuances of noncontrolling interests	33,318						33,318
Purchase of noncontrolling interests	(1,218)		(1,079)			(1,079)	(139)
Balance (in shares) at Sep. 30, 2019		494,848
Balance at Sep. 30, 2019	$ 6,523,359	$ 494,848	8,904,765	(3,461,256)	(5,223)	5,933,134	590,225
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Balance (in shares) at Dec. 31, 2018		477,496													477,496
Balance at Dec. 31, 2018	$ 6,512,591	$ 477,496	8,398,847	(2,927,196)	(4,708)	5,944,439	568,152	590	[1]	590	[1]	590	[1]	6,513,181	$ 477,496	8,398,847	(2,926,606)	(4,708)	5,945,029	568,152
Balance (in shares) at Dec. 31, 2019		505,222													505,222
Balance at Dec. 31, 2019	6,667,474	$ 505,222	9,183,892	(3,601,199)	(2,857)	6,085,058	582,416	(1,524)	[2]	(1,524)	[2]	(1,524)	[2]	6,665,950	$ 505,222	9,183,892	(3,602,723)	(2,857)	6,083,534	582,416
Balance (in shares) at Jun. 30, 2019		491,109
Balance at Jun. 30, 2019	6,619,272	$ 491,109	8,801,037	(3,233,283)	(4,459)	6,054,404	564,868
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(42,308)			(45,863)		(45,863)	3,555
Other comprehensive income (loss)	(764)				(764)	(764)
Issuance of common stock, net (in shares)		3,703
Issuance of common stock, net	102,429	$ 3,703	98,726			102,429
Repurchase of common stock (in shares)		(10)
Repurchase of common stock	(349)	$ (10)	(339)			(349)
Exercise of stock options (in shares)		46
Exercise of stock options	1,216	$ 46	1,170			1,216
Amortization of deferred compensation	4,171		4,171			4,171
Common dividends	(182,110)			(182,110)		(182,110)
Distributions to noncontrolling interests	(7,901)						(7,901)
Issuances of noncontrolling interests	29,703						29,703
Balance (in shares) at Sep. 30, 2019		494,848
Balance at Sep. 30, 2019	6,523,359	$ 494,848	8,904,765	(3,461,256)	(5,223)	5,933,134	590,225
Balance (in shares) at Dec. 31, 2019		505,222													505,222
Balance at Dec. 31, 2019	6,667,474	$ 505,222	9,183,892	(3,601,199)	(2,857)	6,085,058	582,416	$ (1,524)	[2]	$ (1,524)	[2]	$ (1,524)	[2]	$ 6,665,950	$ 505,222	$ 9,183,892	$ (3,602,723)	$ (2,857)	$ 6,083,534	$ 582,416
Increase (Decrease) in Stockholders' Equity
Net income (loss)	278,008			267,169		267,169	10,839
Other comprehensive income (loss)	(379)				(379)	(379)
Issuance of common stock, net (in shares)		33,248
Issuance of common stock, net	1,065,900	$ 33,248	1,032,652			1,065,900
Conversion of DownREIT units to common stock (in shares)		120
Conversion of DownREIT units to common stock	0	$ 120	3,957			4,077	(4,077)
Repurchase of common stock (in shares)		(289)
Repurchase of common stock	(10,273)	$ (289)	(9,984)			(10,273)
Exercise of stock options (in shares)		54
Exercise of stock options	1,806	$ 54	1,752			1,806
Amortization of deferred compensation	15,817		15,817			15,817
Common dividends	(587,596)			(587,596)		(587,596)
Distributions to noncontrolling interests	(22,925)						(22,925)
Balance (in shares) at Sep. 30, 2020		538,355
Balance at Sep. 30, 2020	7,406,308	$ 538,355	10,228,086	(3,923,150)	(3,236)	6,840,055	566,253
Balance (in shares) at Jun. 30, 2020		538,318
Balance at Jun. 30, 2020	7,668,721	$ 538,318	10,222,728	(3,660,187)	(2,186)	7,098,673	570,048
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(59,581)			(63,417)		(63,417)	3,836
Other comprehensive income (loss)	(1,050)				(1,050)	(1,050)
Issuance of common stock, net (in shares)		47
Issuance of common stock, net	511	$ 47	464			511
Repurchase of common stock (in shares)		(10)
Repurchase of common stock	(275)	$ (10)	(265)			(275)
Amortization of deferred compensation	5,159		5,159			5,159
Common dividends	(199,546)			(199,546)		(199,546)
Distributions to noncontrolling interests	(7,631)						(7,631)
Balance (in shares) at Sep. 30, 2020		538,355
Balance at Sep. 30, 2020	$ 7,406,308	$ 538,355	$ 10,228,086	$ (3,923,150)	$ (3,236)	$ 6,840,055	$ 566,253

[1] On January 1, 2019, the Company adopted a series of ASUs related to accounting for leases and recognized the cumulative-effect of adoption to beginning retained earnings. Refer to Note 2 for a detailed impact of adoption.

[2] On January 1, 2020, the Company adopted a series of Accounting Standards Updates (“ASUs”) related to accounting for credit losses and recognized the cumulative-effect of adoption to beginning retained earnings. Refer to Note 2 for a detailed impact of adoption.