Prospectus Supplement No. 7 Filed Pursuant to Rule 424(b)(3) (To Prospectus Dated May 19, 2000) Registration No. 333-35412 Prospectus Supplement Dated September 22, 2000 This prospectus relates to the resale by the holders of our: o $450,000,000 principal amount of 5.0% convertible notes due 2010, and o the shares of Class A common stock issuable upon conversion of the notes. This prospectus supplement should be read in conjunction with, and may not be delivered or utilized without, the prospectus dated May 19, 2000. The terms of the notes are set forth in the prospectus. The information in the table appearing under the heading "Selling Securityholders" on page 33 in the prospectus is hereby amended by adding the information below with respect to selling securityholders not previously listed in the prospectus or in any amendments or supplements thereto, and by superceding the information with respect to selling securityholders previously listed in the prospectus or in any amendments or supplements thereto that are listed below: Number of Shares Percentage of Principal Amount of Class A Common Number of Class A at Maturity of 5.0% Stock Issuable Shares of Class Common Stock Notes Beneficially Upon Conversion of A Common Stock Outstanding as Owned That May the 5.0% Notes That Beneficially of September Selling Securityholders be Sold May be Sold Owned** 20, 2000*** ------------------------- ------------------- ------------------- --------------- -------------- 1976 Distribution Trust FBO Aerin Lauder/Zinterhoffer $22,000 427 -- * AXP Bond Fund, Inc. $0 0 -- * AXP Variable Portfolio - Bond Fund $0 0 -- * AXP Variable Portfolio - Managed Fund $0 0 -- * Bankers Trust Company Trustee for Chrysler Corp. EMP #1 Pension Plan DTD 4/1/89 $4,125,000 80,097 -- * Boulder II Limited $0 0 -- * Credit Suisse First Boston Corporation (1) $2,830,000 54,951 -- * Franklin and Marshall College $0 0 -- * General Motors Employees Global Group Pension Fund $0 0 -- * Highbridge International LLC $3,805,000 73,883 -- * Lipper Convertibles Series II, L.P. $0 0 -- * Lipper Offshore Convertibles, L.P. $0 0 -- * Lipper Offshore Convertibles, L.P. #2 $0 0 -- * Morgan Stanley & Co. (1) $1,500,000 29,126 -- * New York Life Insurance & Annuity Corporation (NYLIAU) $1,200,000 23,300 -- * Onex Industrial Partners Limited $0 0 -- * Penn Treaty Network America Insurance Co. $0 0 -- * State Street Bank Custodian for GE Pension Trust $0 0 -- * The TCW Group $33,375,000 648,058 -- * Total Return Portfolio Fund $0 0 -- * =========== ======= ==== == TOTAL $46,857,000 909,842 -- ** Less than 1%. ** In addition to the shares issuable upon conversion of the notes. *** Includes shares issuable upon conversion of the notes and additional shares beneficially owned as of September 20, 2000. (1) Entity shown in the table, or an affiliate of the entity, was one of the initial purchasers of these notes and/or other notes of the Company that were sold in a private placement. The initial purchasers acquired such notes at a discount. In addition, some of these entities or their affiliates have participated in other offerings of securities by the Company and/or have performed other banking services for which they have received fees.