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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Issuance of common stock, shares | 531,164 | 753,607 | 734,786
Restricted shares |  |  | 186,968
Pursuant to dividend reinvestment plan, shares | 475,162 | 595,388 | 498,248
Exercise of employee stock options and issuance of directors' deferred stock, shares | 56,002 | 158,219 | 49,570
Partnership units, shares |  |  | 1,497,814
Issuance of partnership units pursuant to dividend reinvestment plan, shares | 88,309 |  |
Series A Preferred Stock |  |  |
Redemption of preferred stock, shares | 24,000 |  |
Series B Preferred Stock |  |  |
Redemption of preferred stock, shares | 31,731 |  |
Series C Preferred Stock |  |  |
Issuance of common stock, shares | 56,000 |  |
Dividend Declared |  |  |
Distributions payable common stock (in usd per share) | $ 0.36 | $ 0.36 | $ 0.36
Distributions partnership units (in usd per share) | $ 0.36 | $ 0.36 | $ 0.36
Dividend Declared | Series A Preferred Stock |  |  |
Preferred stock (in usd per share) | $ 50.00 | $ 50.00 | $ 50.00
Dividend Declared | Series B Preferred Stock |  |  |
Preferred stock (in usd per share) |  | $ 56.25 | $ 56.25
Dividend Declared | Series C Preferred Stock |  |  |
Preferred stock (in usd per share) | $ 42.97 |  |

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