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Consolidated Statements of Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Shares issued pursuant to dividend reinvestment plan | 293,615,000 | 228,498,000 | 430,462,000
Shares due to exercise of employee stock options and issuance of directors' deferred stock | 70,231,000 | 16,887,000 | 61,571,000
Issuance of partnership units (in shares) |  | 51,579,000 | 60,936,000
Limited Partner |  |  |
Shares issued pursuant to dividend reinvestment plan | 61,009,000 |  |
Twinbrook Metro Station |  |  |
Stock issued during period, shares, acquisitions | 469,740,000 |  |
Twinbrook Metro Station | Restricted Stock Units (RSUs) |  |  |
Stock issued during period, shares, acquisitions | 1,416,071,000 |  |
Restricted Units Released Pursuant to First Escrow Release, Shares | 708,036,000 |  |
Ashbrook Marketplace |  |  |
Stock issued during period, shares, acquisitions | 93,674,000 |  |
Series C Cumulative Preferred Stock |  |  |
Redemption of Series C Cumulative preferred stock (in shares) |  |  | 42,000,000
Series E Cumulative Redeemable Preferred Stock |  |  |
Issuance of Series D Cumulative preferred stock (in shares) |  |  | 44,000,000
Dividend declared |  |  |
Distributions payable common stock and partnership units (in usd per share) | $ 0.57 | $ 0.53 | $ 0.53
Dividend declared | Series D Cumulative Redeemable Preferred Stock |  |  |
Distributions payable on preferred stock (in usd per share) | 38.28 | 38.28 | 38.28
Dividend declared | Series E Cumulative Redeemable Preferred Stock |  |  |
Distributions payable on preferred stock (in usd per share) | $ 37.50 | $ 37.50 | $ 37.50

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