<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-START> JAN-01-1998 <PERIOD-END> SEP-30-1998 <CASH> 150,218 <SECURITIES> 17,451 <RECEIVABLES> 157,931 <ALLOWANCES> 0 <INVENTORY> 50,441 <CURRENT-ASSETS> 498,932 <PP&E> 865,671 <DEPRECIATION> 469,985 <TOTAL-ASSETS> 1,118,292 <CURRENT-LIABILITIES> 395,166 <BONDS> 109,774 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 80,264 <OTHER-SE> 491,903 <TOTAL-LIABILITY-AND-EQUITY> 1,118,292 <SALES> 1,433,531 <TOTAL-REVENUES> 1,433,531 <CGS> 697,762 <TOTAL-COSTS> 1,294,304 <OTHER-EXPENSES> (13,626) <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 6,293 <INCOME-PRETAX> 146,560 <INCOME-TAX> 60,849 <INCOME-CONTINUING> 85,711 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 85,711 <EPS-BASIC> 1.06 <EPS-DILUTED> 1.06