<ARTICLE> 5 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-2000 <PERIOD-END> JUN-30-2000 <CASH> 17,785 <SECURITIES> 0 <RECEIVABLES> 162,376 <ALLOWANCES> 2,691 <INVENTORY> 109,716 <CURRENT-ASSETS> 298,942 <PP&E> 1,299,823 <DEPRECIATION> 818,374 <TOTAL-ASSETS> 969,394 <CURRENT-LIABILITIES> 124,448 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 457 <OTHER-SE> 531,565 <TOTAL-LIABILITY-AND-EQUITY> 969,394 <SALES> 461,686 <TOTAL-REVENUES> 461,686 <CGS> 321,078 <TOTAL-COSTS> 369,653 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 2,991 <INCOME-PRETAX> 90,378 <INCOME-TAX> 28,017 <INCOME-CONTINUING> 62,361 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 62,361 <EPS-BASIC> 1.36 <EPS-DILUTED> 1.34