PROSPECTUS SUPPLEMENT NO. 4 | Filed pursuant to Rule 424(b)(3) | |
(To Prospectus Dated August 15, 2006) | File Number 333-136651 |
Principal | ||||||||||||||||
Amount of Notes | ||||||||||||||||
Beneficially Owned | Percentage | Percentage of | Common | |||||||||||||
and Offered | of Notes | Common Stock | Stock Offered | |||||||||||||
Name | Hereby | Outstanding | Outstanding(1) | Hereby(2) | ||||||||||||
Credit Suisse Securities (USA) LLC |
$ | 2,500,000 | 1.00 | % | 0.08 | % | 55,273 | |||||||||
FFVA Mutual Insurance Company |
$ | 34,000 | 0.01 | % | 0.00 | % | 752 | |||||||||
Georgia Municipal Employee
Benefit System |
$ | 791,000 | 0.32 | % | 0.02 | % | 17,488 | |||||||||
J.P. Morgan Securities Inc. |
$ | 4,175,000 | 1.67 | % | 0.13 | % | 92,305 |
(1) | Calculated based on 73,661,336 shares of our common stock outstanding as of July 31, 2006. In calculating this amount for each holder, we treated as outstanding the number of shares of our common stock issuable upon conversion of all that holderss notes, but we did not assume conversion of any other holders notes. | |
(2) | Represents the maximum number of shares of our common stock issuable upon conversion of all of the holders notes, based on the maximum conversion rate of 22.1091 shares of our common stock per $1,000 principal amount at maturity of the notes. This conversion rate is subject to adjustment, however, as described in the prospectus under Description of NotesConversion RightsConversion Rate Adjustments. As a result, the maximum number of shares of our common stock issuable upon conversion of the notes may increase or decrease in the future. |