Selling Security Holders

      We originally issued the notes to Goldman, Sachs & Co., Deutsche Bank Securities Inc. and, J.P. Morgan Securities Inc. as initial purchasers in a transaction exempt from the registration requirements of the Securities Act. The initial purchasers resold the notes in transactions exempt from the registration requirements of the Securities Act in reliance on Rule 144A under the Securities Act to persons reasonably believed by them to be qualified institutional buyers. A predecessor registration statement on Form S-1 (Registration No. 333-127918) was declared effective by the SEC on December 13, 2005. We believe that certain holders of the notes utilized such registration statements to effect offers and sales of the notes. The registration statement of which this prospectus is a part represents the successor to that predecessor registration statement, which has been withdrawn.

      The selling security holders identified below, including their transferees, pledgees, donees and successors, may from time to time offer and sell pursuant to this prospectus or a supplement hereto any or all of the notes of such selling security holder described below and the common stock into which such notes are convertible. Any selling security holder may also elect not to sell any notes or common stock issuable upon conversion of the notes held by it. Certain selling security holders identified below may already have sold, transferred or disposed of all or a portion of their notes or shares of common stock issuable upon conversion of the notes since the date on which they provided the information regarding their ownership of those securities included in this prospectus and other selling security holders identified below may have purchased such notes or shares of common stock issuable upon conversion of such notes. Only those notes and shares of common stock issuable upon conversion of the notes listed below or in any supplement hereto may be offered for resale by the selling holders pursuant to this prospectus.

      The following table sets forth recent information with respect to the selling security holders of the notes and the number of notes beneficially owned by each selling security holder that may be offered pursuant to this prospectus. We prepared this table based on information supplied to us by or on behalf of the selling holders. Because the selling security holders may offer all or only some portion of the notes or the common stock listed in the table, no estimate can be given as to the amount of those securities that will be held by the selling holders upon termination of any sales.