<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM THE CONSOLIDATED
BALANCE SHEET AND THE CONSOLIDATED STATEMENT OF INCOME FILED AS PART OF THE
QUARTERLY REPORT ON FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY SUCH QUARTERLY
REPORT ON FORM 10-Q.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                         $29,177
<SECURITIES>                                        $0
<RECEIVABLES>                                 $133,682
<ALLOWANCES>                                    $2,706
<INVENTORY>                                   $116,414
<CURRENT-ASSETS>                              $295,460
<PP&E>                                      $1,235,875
<DEPRECIATION>                                $730,797
<TOTAL-ASSETS>                                $904,239
<CURRENT-LIABILITIES>                         $117,732
<BONDS>                                             $0
<PREFERRED-MANDATORY>                               $0
<PREFERRED>                                         $0
<COMMON>                                          $470
<OTHER-SE>                                    $431,870
<TOTAL-LIABILITY-AND-EQUITY>                  $904,239
<SALES>                                       $615,444
<TOTAL-REVENUES>                              $615,444
<CGS>                                         $423,936
<TOTAL-COSTS>                                 $524,812
<OTHER-EXPENSES>                                    $0
<LOSS-PROVISION>                                    $0
<INTEREST-EXPENSE>                              $2,303
<INCOME-PRETAX>                                $89,908
<INCOME-TAX>                                   $27,871
<INCOME-CONTINUING>                            $62,037
<DISCONTINUED>                                      $0
<EXTRAORDINARY>                                     $0
<CHANGES>                                           $0
<NET-INCOME>                                   $62,037
<EPS-PRIMARY>                                    $1.17
<EPS-DILUTED>                                    $1.16