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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2019
STOCKHOLDERS' EQUITY |
Schedule of changes in issued and outstanding common and preferred stock | The following table presents the changes in the Company’s issued and outstanding shares of common and preferred stock for the years ended December 31, 2019, 2018 and 2017 (shares in thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Common | ​ | Preferred Stock
​ | ​ | Stock | ​ | Series E | ​ | Series F
Balance at December 31, 2016 |  | 267,259 |  | 2,797 |  | 16,196
Issuance/(forfeiture) of common and restricted shares, net |  | 70 |  | — |  | —
Issuance of common shares through public offering |  | 87 |  | — |  | —
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership |  | 8 |  | — |  | —
Conversion of Series E Cumulative Convertible shares | ​ | 17 | ​ | (16) | ​ | —
Adjustment for conversion of noncontrolling interest of unitholders in the DownREIT Partnership | ​ | 381 |  | — |  | —
Forfeiture of Series F shares | ​ | — |  | — |  | (344)
Balance at December 31, 2017 |  | 267,822 |  | 2,781 |  | 15,852
Issuance/(forfeiture) of common and restricted shares, net |  | 47 |  | — |  | —
Issuance of common shares upon exercise of stock options |  | 772 | ​ | ​ | ​ | ​
Issuance of common shares through public offering | ​ | 7,150 | ​ | ​ | ​ | ​
Repurchase of common shares | ​ | (593) | ​ | ​ | ​ | ​
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership |  | 11 |  | — |  | —
Adjustment for conversion of noncontrolling interest of unitholders in the DownREIT Partnership |  | 337 |  | — |  | —
Forfeiture of Series F shares |  | — |  | — |  | (50)
Balance at December 31, 2018 |  | 275,546 |  | 2,781 |  | 15,802
Issuance/(forfeiture) of common and restricted shares, net |  | 50 |  | — |  | —
Issuance of common shares through public offering | ​ | 7,500 |  | — |  | —
Issuance of common shares though ATM program | ​ | 6,988 | ​ | — | ​ | —
Issuance of common shares through forward sales agreement | ​ | 1,339 |  | — |  | —
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership |  | 1,969 |  | — |  | —
Adjustment for conversion of noncontrolling interest of unitholders in the DownREIT Partnership |  | 1,196 |  | — |  | —
Forfeiture of Series F shares |  | — |  | — |  | (1,111)
Balance at December 31, 2019 |  | 294,588 |  | 2,781 |  | 14,691

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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