Prospectus Supplement No. 1                    Filed Pursuant to Rule 424(b)(3)
(To Prospectus Dated May 19, 2000)             Registration No. 333-35412

                              Prospectus Supplement
                               Dated May 22, 2000

This prospectus relates to the resale by the holder 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 supplemented to include
the following table:

Principal Number of Amount at Shares of Class Number of Percentage of Maturity of A Common Stock Shares of Class A 5.0% Notes Issuable Upon Class A Common Stock Beneficially Conversion of Common Stock Outstanding Owned That the 5.0% Notes Beneficially as of May Selling Securityholders May Be Sold That May Be Sold Owned** 17, 2000*** ----------------------- ----------- ---------------- ------------ -------------- 1976 Distribution Trust FBO Aerin Lauder/Zinterhoffer $23,000 446 -- * 1976 Distribution Trust FBO Jane A. Lauder $23,000 446 -- * Allstate Insurance Company $3,000,000 58,252 -- * Arkansas PERS $1,900,000 36,893 -- * Arkansas Teachers Retirement System $3,267,000 63,436 -- * Aspen Growth & Income Fund $600,000 11,650 -- * Associated Electric & Gall Insurance Services Limited $900,000 17,475 -- * AXP Bond Fund, Inc. $1,730,000 33,592 -- * AXP Utilities Income Fund, Inc. $10,367,000 201,300 -- * AXP Variable Portfolio - Bond Fund $765,000 14,854 -- * AXP Variable Portfolio - Managed Fund $1,410,000 27,378 -- * Bancroft Convertible Fund, Inc. $750,000 14,563 -- * Bank Austria Cayman Island, Ltd. $3,005,000 58,349 -- * Bankers Trust Company Trustee for Chrysler Corp. EMP #1 Pension Plan DTD 4/1/89 $6,327,000 122,854 -- * Baptist Health of South Florida $154,000 2,990 -- * Bear, Stearns & Co. Inc. (1) $3,000,000 58,252 -- * BNP Arbitrage SNC $500,000 9,708 -- * Boilermakers Blacksmith Pension Trust $1,350,000 26,213 -- * Boston Museum of Fine Arts $125,000 2,427 -- * Boulder II Limited $1,000,000 19,417 -- * BVI Social Security Board $44,000 854 -- * CALAMOS(R)Market Neutral Fund-CALAMOS(R)Investment Trust $640,000 12,427 -- * California Automobile Association $100,000 1,941 -- * California State Automobile Association Co. $300,000 5,825 -- * Chartwell Investment Partners $1,000,000 19,417 -- * Chrysler Corporation Master Retirement Trust $10,425,000 202,427 -- * Principal Number of Amount at Shares of Class Number of Percentage of Maturity of A Common Stock Shares of Class A 5.0% Notes Issuable Upon Class A Common Stock Beneficially Conversion of Common Stock Outstanding Owned That the 5.0% Notes Beneficially as of May Selling Securityholders May Be Sold That May Be Sold Owned** 17, 2000*** ----------------------- ----------- ---------------- ------------ -------------- CIBC World Markets $12,190,000 236,699 -- * City University of New York $114,000 2,213 -- * Clinton Riverside Convertible Portfolio Limited $2,500,000 48,543 -- * Consulting Group Capital Markets Funds $320,000 6,213 -- * Convexity Partners L.P. $250,000 4,854 -- * Delaware PERS $2,410,000 46,796 -- * Delphi Foundation, Inc. $28,000 543 -- * Delta Air Lines Master Trust c/o Oaktree Capital Management, LLC $3,975,000 77,184 -- * Deutsche Bank Securities Inc. (1) $17,745,000 344,563 -- * Ellsworth Convertible Growth and Income Fund, Inc. $750,000 14,563 -- * Employee Benefit Convertible Securities Fund, DTC #955 Bank of America Personal Trust $250,000 4,854 -- * Engineers Joint Pension Fund $444,000 8,621 -- * Family Service Life Insurance Co. $200,000 3,883 -- * Forest Alternative Strategies Fund LP II Series A5I $115,000 2,233 -- * Forest Alternative Strategies Fund LP II Series A5M $70,000 1,359 -- * Forest Fulcrum Fund LP $545,000 10,582 -- * Forest Global Convertible Fund Series A5 $10,175,000 197,572 -- * Franklin and Marshall College $413,000 8,019 -- * GCG Total Return Series $1,110,000 21,553 -- * General Motors Employees Global Group Pension Fund $5,285,000 102,621 -- * General Motors Foundation, Inc. $287,000 5,572 -- * Georges et/ou Noya Andraos $100,000 1,941 -- * GLG Global Convertible Fund $4,000,000 77,669 -- * GLG Global Convertible Ucits Fund $1,000,000 19,417 -- * GLG Market Neutral Fund $2,600,000 50,485 -- * Goldman Sachs and Company (1) $500,000 9,708 -- * Grady Hospital $170,000 3,300 -- * Guardian Life Insurance Co. $7,500,000 145,631 94,500 * Guardian Pension Trust $300,000 5,825 -- * Highbridge International LLC $7,305,000 141,844 -- * ICI American Holdings Trust $1,250,000 24,271 -- * IDS Life Series Fund, Inc. - Income Portfolio $65,000 1,262 -- * Independence Blue Cross $80,000 1,553 -- * J.P. Morgan Securities Inc. $1,000,000 19,417 -- * Janus Growth & Income Fund $40,450,000 785,436 -- * Julius Baer Securities Inc. $1,068,000 20,737 -- * KVS Growth & Income Portfolio $200,000 3,883 -- * Lipper Convertibles Series II, L.P. $500,000 9,708 -- * Lipper Convertibles, L.P. $3,000,000 58,252 -- * Lipper Offshore Convertibles, L.P. $1,000,000 19,417 -- * Lipper Offshore Convertibles, L.P. #2 $500,000 9,708 -- * LLT Limited $650,000 12,621 -- * Local Initiatives Support Corporation $70,000 1,359 -- * Principal Number of Amount at Shares of Class Number of Percentage of Maturity of A Common Stock Shares of Class A 5.0% Notes Issuable Upon Class A Common Stock Beneficially Conversion of Common Stock Outstanding Owned That the 5.0% Notes Beneficially as of May Selling Securityholders May Be Sold That May Be Sold Owned** 17, 2000*** ----------------------- ----------- ---------------- ------------ -------------- London Pacific Total Return $20,000 388 -- * Mainstay Convertible Fund $3,925,000 76,213 -- * Mainstay Global High Yield $75,000 1,456 -- * Maryland Retirement System $2,397,000 46,543 -- * Merrill Lynch Convertible Fund, Inc. (1) $500,000 9,708 -- * Merrill Lynch Insurance Group (1) $389,000 7,553 -- * MFS Total Return Fund $3,710,000 72,038 -- * MFS Total Return Variable $480,000 9,320 -- * MFS VII-MFS Total Return Series $410,000 7,961 -- * MFS/Sun Life - Total Return Series $2,870,000 55,728 -- * Morgan Stanley Dean Witter Convertible Securities Trust (1) $300,000 5,825 -- * Motion Picture Industry Health Plan - Active Member Fund $1,210,000 23,495 -- * Motion Picture Industry Health Plan - Retiree Member Fund $605,000 11,747 -- * Motors Insurance Corporation $1,400,000 27,184 -- * Museum of Fine Arts, Boston $50,000 970 -- * Nations Capital Income Fund, DTC #901 Bank of New York $4,050,000 78,640 -- * New Hampshire Retirement System $320,000 6,213 -- * New Orleans Firefighters Pension $176,000 3,417 -- * New York Life Insurance Company (NYLIC) $20,300,000 394,174 -- * New York Life Insurance and Annuity Corporation (NYLIAU) $2,200,000 42,718 -- * Nicholas-Applegate Convertible Fund $998,000 19,378 -- * Nomura Securities International Inc. $6,150,000 119,417 -- * Occidental Petroleum $299,000 5,805 -- * OCM Convertible Trust $5,165,000 100,291 -- * Onex Industrial Partners Limited $1,000,000 19,417 -- * Oppenheimer Convertible Securities Fund $8,000,000 155,339 -- * Pacific Life Insurance Company $1,500,000 29,126 -- * Pacific Specialty (Convertibles) $100,000 1,941 -- * Parker-Hannifin Corporation $60,000 1,165 -- * Partner Reinsurance Company Ltd. $2,215,000 43,009 -- * Pell Rudman Trust Company $2,180,000 42,330 154,460 * Penn Treaty Network America Insurance Company $502,000 9,747 -- * Physicians Life $347,000 6,737 -- * Pilgrim Convertible Fund $3,922,000 76,155 -- * PIMCO Convertible Bond Fund $1,500,000 29,126 -- * PIMCO Total Return Fund $2,000,000 38,834 -- * PRIM Board $2,800,000 54,368 -- * ProMutual $200,000 3,883 -- * Putnam Asset Allocation Funds-Balanced Portfolio $1,100,000 21,359 -- * Putnam Asset Allocation Funds-Convertible Portfolio $700,000 13,592 -- * Putnam Balanced Retirement Fund $110,000 2,135 -- * Putnam Convertible Income-Growth Trust $8,000,000 155,339 -- * Principal Number of Amount at Shares of Class Number of Percentage of Maturity of A Common Stock Shares of Class A 5.0% Notes Issuable Upon Class A Common Stock Beneficially Conversion of Common Stock Outstanding Owned That the 5.0% Notes Beneficially as of May Selling Securityholders May Be Sold That May Be Sold Owned** 17, 2000*** ----------------------- ----------- ---------------- ------------ -------------- Putnam Convertible Opportunities and Income Trust $140,000 2,718 -- * Ramius Capital Group Holdings, Ltd. $495,000 9,611 -- * Raymond James & Associates (1) $150,000 2,912 -- * Rhone-Poulenc Rorer Pension Plan $70,000 1,359 -- * Salomon Smith Barney, Inc. (1) $1,312,000 25,475 -- * San Diego City Retirement $889,000 17,262 -- * San Diego County Convertible $2,133,000 41,417 -- * Shell Pension Trust $235,000 4,563 -- * State Employees' Retirement Fund of the State of Delaware $5,300,000 102,912 -- * State of Connecticut Combined Investment Funds $11,695,000 227,087 -- * State of Oregon Equity $10,000,000 194,174 -- * State Street Bank Custodian for GE Pension Trust $3,033,000 58,893 -- * STI Capital Management $1,000,000 19,417 -- * Strong Total Return Fund, Inc. $2,000,000 38,834 -- * Sun America Balanced $360,000 6,990 -- * Sylvan IMA Ltd. c/o Forest Investment Management $1,800,000 34,951 -- * TCW Group, Inc. $33,905,000 658,349 -- * The Adams Express Company $9,500,000 184,466 -- * The Class IC Company, Ltd. $1,500,000 29,126 -- * The Grable Foundation $160,000 3,106 -- * Total Return Portfolio $1,053,000 20,446 -- * University of Rochester $50,000 970 -- * Van Kampen Convertible Securities Fund (1) $935,000 18,155 -- * Van Kampen Harbor Fund (1) $5,065,000 98,349 -- * Vanguard Convertible Securities Fund, Inc. $10,910,000 211,844 -- * Wake Forest University $1,070,000 20,776 -- * White River Securities LLC $3,000,000 58,252 -- * Writers Guild - Industry Health Fund $276,000 5,359 -- * ZCM/HFR Index Management, L.L.C. $110,000 2,135 -- * Zeneca Holdings Trust $990,000 19,223 -- * ============ ========= ======= == TOTAL $388,560,000 7,544,785 248,960 5% * 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 May 17, 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.