<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
ANNUAL REPORT ON FORM 10-K AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
ANNUAL REPORT ON FORM 10-K.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                         $14,242
<SECURITIES>                                        $0
<RECEIVABLES>                                 $142,583
<ALLOWANCES>                                    $1,290
<INVENTORY>                                    $84,499
<CURRENT-ASSETS>                              $259,141
<PP&E>                                      $1,148,832
<DEPRECIATION>                                $653,108
<TOTAL-ASSETS>                                $846,261
<CURRENT-LIABILITIES>                         $147,948
<BONDS>                                             $0
<PREFERRED-MANDATORY>                               $0
<PREFERRED>                                         $0
<COMMON>                                          $550
<OTHER-SE>                                    $504,648
<TOTAL-LIABILITY-AND-EQUITY>                  $846,261
<SALES>                                       $854,481
<TOTAL-REVENUES>                              $854,481
<CGS>                                         $611,353
<TOTAL-COSTS>                                 $761,055
<OTHER-EXPENSES>                                    $0
<LOSS-PROVISION>                                    $0
<INTEREST-EXPENSE>                              $2,529
<INCOME-PRETAX>                               $253,079
<INCOME-TAX>                                   $97,020
<INCOME-CONTINUING>                           $156,059
<DISCONTINUED>                                      $0
<EXTRAORDINARY>                                     $0
<CHANGES>                                           $0
<NET-INCOME>                                  $156,059
<EPS-PRIMARY>                                    $2.65
<EPS-DILUTED>                                    $2.65