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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Pursuant to dividend reinvestment plan, shares | 201,212 | 197,638 | 475,162
Exercise of employee stock options and issuance of directors' deferred stock, shares | 117,886 | 172,887 | 56,002
Issuance of partnership units pursuant to dividend reinvestment plan, shares | 107,037 | 196,183 | 88,309
Series A Preferred Stock |  |  |
Redemption of preferred stock, shares |  | 16,000 | 24,000
Series B Preferred Stock |  |  |
Redemption of preferred stock, shares |  |  | 31,731
Series C Preferred Stock |  |  |
Issuance of common stock, shares |  | 16,000 | 56,000
Dividend Declared |  |  |
Distributions payable common stock (in usd per share) | $ 0.43 | $ 0.40 | $ 0.36
Distributions partnership units (in usd per share) | 0.43 | 0.40 | 0.36
Dividend Declared | Series A Preferred Stock |  |  |
Preferred stock (in usd per share) |  |  | 50.00
Dividend Declared | Series C Preferred Stock |  |  |
Preferred stock (in usd per share) | $ 42.97 | $ 42.97 | $ 42.97

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