Prospectus excerpt:  We are offering 4,000,000 shares of our 7.125% Series A Cumulative Redeemable Perpetual Preferred Stock, par value $0.01 per share, which we refer to in this prospectus supplement as our Series A Preferred Stock. This is the original issuance of our Series A Preferred Stock. Dividends on our Series A Preferred Stock will be cumulative from the date of original issue and payable quarterly on or about the 15th day of each January, April, July and October at the rate of 7.125% per annum of its liquidation preference, which is equivalent to $1.78125 per annum per share. The first dividend on our Series A Preferred Stock is payable on April 15, 2018 (in the amount of $0.14844 per share).