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Consolidated Statement of Equity (Parenthetical) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2018
Shares pursuant to dividend reinvestment plan (in shares) | 0 | 120,347
Shares due to exercise of employee stock options and issuance of directors' deferred stock (in shares) | 0 | 485
Issuance of partnership units pursuant to dividend reinvestment plan (in shares) | 0 | 13,742
Dividend Distributions Payable |  |
Distributions payable common stock, per share (in usd per share) | $ 0.53 | $ 0.53
Distributions partnership units, per unit (in usd per share) | 0.53 | 0.53
Series C Cumulative Preferred Stock | Dividend Distributions Payable |  |
Distributions payable on preferred stock, per share (in usd per share) |  | 42.97
Series D Cumulative Redeemable Preferred Stock | Dividend Distributions Payable |  |
Distributions payable on preferred stock, per share (in usd per share) | 38.28 | $ 38.28
Series E Cumulative Redeemable Preferred Stock | Dividend Distributions Payable |  |
Distributions payable on preferred stock, per share (in usd per share) | $ 37.50 |

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