Prospectus excerpt:  We are selling 8,000,000 of our 5.50% Series D Preferred Shares, par value $0.0125 per share (the ôSeries D Preferred Sharesö).

Upon liquidation, dissolution or winding-up, the holders of the Series D Preferred Shares will be entitled to receive from our assets legally available for distribution to shareholders a liquidation preference of $25 per share, plus declared and unpaid dividends, if any, to the date fixed for distribution. Dividends on the Series D Preferred Shares will be payable on a non-cumulative basis only when, as and if declared by our board of directors, quarterly in arrears on March 1, June 1, September 1 and December 1 of each year, commencing on September 1, 2013, at a rate equal to 5.50% of the liquidation preference per annum (equivalent to $1.375 per share).

On and after June 1, 2018, we may redeem the Series D Preferred Shares, in whole or in part, at any time, at a redemption price of $25 per share, plus declared and unpaid dividends, if any, to, but excluding, the date of redemption. At any time prior to June 1, 2018, we may redeem the Series D Preferred Shares in whole at a redemption price of $26 per Series D Preferred Share, plus declared and unpaid dividends, if any, to, but excluding, the date of redemption, only if we submit to the holders of our common shares a proposal for an amalgamation or merger or if we submit any proposal for any other matter that requires, as a result of a change in Bermuda law after the date of this prospectus supplement, for its validation or effectuation an affirmative vote of the holders of the Series D Preferred Shares at the time outstanding, whether voting as a separate series or together with any other series or class of preference shares as a single class. In addition, following the occurrence of a tax event or within 90 days following the occurrence of a capital redemption trigger date, each as described elsewhere in this prospectus supplement, we may redeem the Series D Preferred Shares, in whole or in part, at a redemption price of $25 per share, plus declared and unpaid dividends, if any, to, but excluding, the date of redemption.