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## Item 15. Exhibits and Financial Statement Schedules 

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The following exhibits are filed as a part of this report. 

## 3. Articles of Incorporation and Bylaws 

3.1 First Amended and Restated Articles of Incorporation of the Registrant, as amended (filed as Exhibit 3.1 to the Registrant’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 3, 2012, and incorporated herein by reference). 

3.2 Articles Supplementary Establishing and Fixing the Rights and Preferences of 6.625% Series D Cumulative Preferred Stock, par value $0.01 per share, dated February 21, 2012 (filed as Exhibit 3.1 to the Registrant’s Current Report on Form 8-K dated February 23, 2012, incorporated herein by reference). 

3.3 Articles Supplementary Establishing and Fixing the Rights and Preferences of 5.700% Series E Cumulative Preferred Stock, par value $0.01 per share, dated May 29, 2013 (filed as Exhibit 3.1 to the Registrant’s Current Report on Form 8-K dated May 30, 2013, incorporated herein by reference). 

3.4 Third Amended and Restated Bylaws of the Registrant, dated May 1, 2006, as amended (filed herewith). 

3.5 Second Amendment to the Third Amended and Restated Bylaws of the Registrant, dated December 13, 2007 (filed herewith). 

3.6 Third Amendment to the Third Amended and Restated Bylaws of the Registrant, dated February 13, 2014 (filed herewith). 

## 4. Instruments Defining the Rights of Security Holders, Including Indentures 

4.1 Specimen Certificate of Common Stock, par value $0.01 per share, of the Registrant (filed as Exhibit 3.4 to the Registrant’s Registration Statement No. 1-11290 on Form 8-B filed with the Securities and Exchange Commission and incorporated herein by reference). 

