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
Increase (Decrease) in Stockholders' Equity
Cumulative effect of new accounting principle	[1]	$ 79,144			$ 79,144		$ 79,144
Adjusted balance, January 1		5,674,082	$ 469,436	$ 8,226,113	(3,291,376)	$ (24,024)	5,380,149	$ 293,933
Balance at Dec. 31, 2017		5,594,938	$ 469,436	8,226,113	(3,370,520)	(24,024)	5,301,005	293,933
Balance (in shares) at Dec. 31, 2017			469,436
Increase (Decrease) in Stockholders' Equity
Net income (loss)		136,165			130,174		130,174	5,991
Other comprehensive income (loss)		19,944				19,944	19,944
Issuance of common stock, net		3,433	$ 511	2,922			3,433
Issuance of common stock, net (in shares)			511
Repurchase of common stock		(2,778)	$ (117)	(2,661)			(2,778)
Repurchase of common stock (in shares)			(117)
Amortization of deferred compensation		10,218		10,218			10,218
Common dividends (usd per share)		(348,439)			(348,439)		(348,439)
Distributions to noncontrolling interests		(9,466)		0				(9,466)
Issuances of noncontrolling interests		995						995
Purchase of noncontrolling interests		(67,431)		(49,207)			(49,207)	(18,224)
Balance at Jun. 30, 2018		5,416,723	$ 469,830	8,187,385	(3,509,641)	(4,080)	5,143,494	273,229
Balance (in shares) at Jun. 30, 2018			469,830
Balance at Dec. 31, 2017		5,594,938	$ 469,436	8,226,113	(3,370,520)	(24,024)	5,301,005	293,933
Balance (in shares) at Dec. 31, 2017			469,436
Balance at Dec. 31, 2018		6,512,591	$ 477,496	8,398,847	(2,927,196)	(4,708)	5,944,439	568,152
Balance (in shares) at Dec. 31, 2018			477,496
Balance at Mar. 31, 2018		5,480,923	$ 469,725	8,183,166	(3,425,293)	(21,307)	5,206,291	274,632
Balance (in shares) at Mar. 31, 2018			469,725
Increase (Decrease) in Stockholders' Equity
Net income (loss)		92,928			89,942		89,942	2,986
Other comprehensive income (loss)		17,227				17,227	17,227
Issuance of common stock, net		659	$ 129	530			659
Issuance of common stock, net (in shares)			129
Repurchase of common stock		(634)	$ (24)	(610)			(634)
Repurchase of common stock (in shares)			(24)
Amortization of deferred compensation		4,299		4,299			4,299
Common dividends (usd per share)		(174,290)			(174,290)		(174,290)
Distributions to noncontrolling interests		(4,389)		0				(4,389)
Balance at Jun. 30, 2018		5,416,723	$ 469,830	8,187,385	(3,509,641)	(4,080)	5,143,494	273,229
Balance (in shares) at Jun. 30, 2018			469,830
Increase (Decrease) in Stockholders' Equity
Cumulative effect of new accounting principle	[2]	590			590		590
Adjusted balance, January 1		6,513,181	$ 477,496	8,398,847	(2,926,606)	(4,708)	5,945,029	568,152
Balance at Dec. 31, 2018		6,512,591	$ 477,496	8,398,847	(2,927,196)	(4,708)	5,944,439	568,152
Balance (in shares) at Dec. 31, 2018			477,496
Increase (Decrease) in Stockholders' Equity
Net income (loss)		55,010			47,873		47,873	7,137
Other comprehensive income (loss)		249				249	249
Issuance of common stock, net		406,813	$ 13,569	393,244			406,813
Issuance of common stock, net (in shares)			13,569
Conversion of DownREIT units to common stock		0	$ 184	3,890			4,074	(4,074)
Conversion of DownREIT units to common stock (in shares)			184
Repurchase of common stock		(4,582)	$ (149)	(4,433)			(4,582)
Repurchase of common stock (in shares)			(149)
Exercise of stock options		219	$ 9	210			219
Exercise of stock options (in shares)			9
Amortization of deferred compensation		10,358		10,358			10,358
Common dividends (usd per share)		(354,550)			(354,550)		(354,550)
Distributions to noncontrolling interests		(9,823)						(9,823)
Issuances of noncontrolling interests		3,615						3,615
Purchase of noncontrolling interests		(1,218)		(1,079)			(1,079)	(139)
Balance at Jun. 30, 2019		6,619,272	$ 491,109	8,801,037	(3,233,283)	(4,459)	6,054,404	564,868
Balance (in shares) at Jun. 30, 2019			491,109
Balance at Mar. 31, 2019		6,399,065	$ 477,929	8,405,258	(3,042,422)	(3,883)	5,836,882	562,183
Balance (in shares) at Mar. 31, 2019			477,929
Increase (Decrease) in Stockholders' Equity
Net income (loss)		(9,980)			(13,597)		(13,597)	3,617
Other comprehensive income (loss)		(576)				(576)	(576)
Issuance of common stock, net		405,281	$ 13,227	392,054			405,281
Issuance of common stock, net (in shares)			13,227
Repurchase of common stock		(1,663)	$ (54)	(1,609)			(1,663)
Repurchase of common stock (in shares)			(54)
Exercise of stock options		173	$ 7	166			173
Exercise of stock options (in shares)			7
Amortization of deferred compensation		6,247		6,247			6,247
Common dividends (usd per share)		(177,264)			(177,264)		(177,264)
Distributions to noncontrolling interests		(4,408)		0				(4,408)
Issuances of noncontrolling interests		3,615						3,615
Purchase of noncontrolling interests		(1,218)		(1,079)			(1,079)	(139)
Balance at Jun. 30, 2019		$ 6,619,272	$ 491,109	$ 8,801,037	$ (3,233,283)	$ (4,459)	$ 6,054,404	$ 564,868
Balance (in shares) at Jun. 30, 2019			491,109

[1] On January 1, 2018, the Company adopted ASU No. 2017-05, Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets (“ASU 2017-05”), 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, 2019, the Company adopted a series of Accounting Standards Updates (“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.