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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 | 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 Noncontrolling Interests
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Balance at Dec. 31, 2017 | $ 5,594,938 | $ 469,436 | $ 8,226,113 | $ (3,370,520) | $ (24,024) | $ 5,301,005 | $ 293,933 | $ 79,144 | [1] | $ 79,144 | [1] | $ 79,144 | [1] | $ 5,674,082 | $ 469,436 | $ 8,226,113 | $ (3,291,376) | $ (24,024) | $ 5,380,149 | $ 293,933
Balance (in shares) at Dec. 31, 2017 |  | 469,436 |  |  |  |  |  |  |  |  |  |  |  |  | 469,436 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 1,073,474 |  |  | 1,061,093 |  | 1,061,093 | 12,381 |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 19,316 |  |  |  | 19,316 | 19,316 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net | 215,179 | $ 8,078 | 207,101 |  |  | 215,179 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net (in shares) |  | 8,078 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of DownREIT units to common stock | 0 | $ 3 | 133 |  |  | 136 | (136) |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of DownREIT units to common stock (in shares) |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock | (3,432) | $ (141) | (3,291) |  |  | (3,432) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  | (141) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 2,477 | $ 120 | 2,357 |  |  | 2,477 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 120 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred compensation | 16,563 |  | 16,563 |  |  | 16,563 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common dividends | (696,913) |  |  | (696,913) |  | (696,913) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interests | (18,415) |  |  |  |  |  | (18,415) |  |  |  |  |  |  |  |  |  |  |  |  |
Issuances of noncontrolling interests | 299,666 |  |  |  |  |  | 299,666 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of noncontrolling interests | (69,406) |  | (50,129) |  |  | (50,129) | (19,277) |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | $ 6,512,591 | $ 477,496 | 8,398,847 | (2,927,196) | (4,708) | 5,944,439 | 568,152 | 590 | [2] | 590 | [2] | 590 | [2] | 6,513,181 | $ 477,496 | 8,398,847 | (2,926,606) | (4,708) | 5,945,029 | 568,152
Balance (in shares) at Dec. 31, 2018 |  | 477,496 |  |  |  |  |  |  |  |  |  |  |  |  | 477,496 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 60,061 |  |  | 45,530 |  | 45,530 | 14,531 |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 1,851 |  |  |  | 1,851 | 1,851 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net | 791,048 | $ 27,523 | 763,525 |  |  | 791,048 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net (in shares) |  | 27,523 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of DownREIT units to common stock | 0 | $ 213 | 4,932 |  |  | 5,145 | (5,145) |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of DownREIT units to common stock (in shares) |  | 213 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock | (5,043) | $ (162) | (4,881) |  |  | (5,043) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  | (162) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 4,538 | $ 152 | 4,386 |  |  | 4,538 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 152 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred compensation | 18,162 |  | 18,162 |  |  | 18,162 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common dividends | (720,123) |  |  | (720,123) |  | (720,123) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interests | (28,301) |  |  |  |  |  | (28,301) |  |  |  |  |  |  |  |  |  |  |  |  |
Issuances of noncontrolling interests | 33,318 |  |  |  |  |  | 33,318 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of noncontrolling interests | (1,218) |  | (1,079) |  |  | (1,079) | (139) |  |  |  |  |  |  |  |  |  |  |  |  |
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) | [3] | $ (1,524) | [3] | $ (1,524) | [3] | $ 6,665,950 | $ 505,222 | $ 9,183,892 | $ (3,602,723) | $ (2,857) | $ 6,083,534 | $ 582,416
Balance (in shares) at Dec. 31, 2019 |  | 505,222 |  |  |  |  |  |  |  |  |  |  |  |  | 505,222 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 428,253 |  |  | 413,563 |  | 413,563 | 14,690 |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | (828) |  |  |  | (828) | (828) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net | 1,067,071 | $ 33,307 | 1,033,764 |  |  | 1,067,071 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net (in shares) |  | 33,307 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of DownREIT units to common stock | 0 | $ 120 | 3,957 |  |  | 4,077 | $ (4,077) |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of DownREIT units to common stock (in shares) |  | 120 |  |  |  |  | 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock | (10,529) | $ (298) | (10,231) |  |  | (10,529) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  | (298) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 1,806 | $ 54 | 1,752 |  |  | 1,806 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred compensation | 20,534 |  | 20,534 |  |  | 20,534 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common dividends | (787,072) |  |  | (787,072) |  | (787,072) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interests | (36,994) |  |  |  |  |  | $ (36,994) |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of noncontrolling interests | (3,619) |  | (3,811) |  |  | (3,811) | 192 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2020 | $ 7,344,572 | $ 538,405 | $ 10,229,857 | $ (3,976,232) | $ (3,685) | $ 6,788,345 | $ 556,227 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2020 |  | 538,405 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | On January 1, 2018, the Company adopted Accounting Standards Update (“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 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.
[3] | On January 1, 2020, the Company adopted a series of 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.

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