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Consolidated Statements of Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Shares issued pursuant to dividend reinvestment plan (in shares) | 572,928 | 266,011 | 186,797
Shares due to exercise of employee stock options and issuance of directors' deferred stock (in shares) | 43,150 | 152,758 | 251,323
Issuance of partnership units pursuant to dividend reinvestment plan (in shares) | 107,433 | 111,351 | 124,758
Issuance of partnership units (in shares) | 284,113 |  |
Series D Cumulative Redeemable Preferred Stock |  |  |
Issuance of Series D Cumulative preferred stock (in shares) | 30,000 |  |
Series C Cumulative Preferred Stock |  |  |
Redemption of Series C Cumulative preferred stock (in shares) | 30,000 |  |
Dividend declared |  |  |
Distributions payable common stock and partnership units (in usd per share) | $ 0.53 | $ 0.52 | $ 0.51
Dividend declared | Series D Cumulative Redeemable Preferred Stock |  |  |
Distributions payable on preferred stock (in usd per share) | 38.28 |  |
Dividend declared | Series C Cumulative Preferred Stock |  |  |
Distributions payable on preferred stock (in usd per share) | $ 42.97 | $ 42.97 | $ 42.97

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