<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 SUCH ANNUAL
REPORT ON FORM 10-K
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                         $34,322
<SECURITIES>                                        $0
<RECEIVABLES>                                 $156,870
<ALLOWANCES>                                    $2,449
<INVENTORY>                                    $90,283
<CURRENT-ASSETS>                              $296,736
<PP&E>                                      $1,188,252
<DEPRECIATION>                                $691,612
<TOTAL-ASSETS>                                $888,181
<CURRENT-LIABILITIES>                         $112,560
<BONDS>                                             $0
<PREFERRED-MANDATORY>                               $0
<PREFERRED>                                         $0
<COMMON>                                          $539
<OTHER-SE>                                    $516,797
<TOTAL-LIABILITY-AND-EQUITY>                  $888,181
<SALES>                                       $829,850
<TOTAL-REVENUES>                              $829,850
<CGS>                                         $568,424
<TOTAL-COSTS>                                 $709,143
<OTHER-EXPENSES>                                    $0
<LOSS-PROVISION>                                    $0
<INTEREST-EXPENSE>                                $719
<INCOME-PRETAX>                               $120,905
<INCOME-TAX>                                   $40,923
<INCOME-CONTINUING>                            $79,982
<DISCONTINUED>                                      $0
<EXTRAORDINARY>                                     $0
<CHANGES>                                           $0
<NET-INCOME>                                   $79,982
<EPS-PRIMARY>                                    $1.45
<EPS-DILUTED>                                    $1.44