<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>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                         $38,041
<SECURITIES>                                        $0
<RECEIVABLES>                                 $134,175
<ALLOWANCES>                                    $3,030
<INVENTORY>                                   $126,627
<CURRENT-ASSETS>                              $314,749
<PP&E>                                      $1,262,534
<DEPRECIATION>                                $752,721
<TOTAL-ASSETS>                              $1,083,039
<CURRENT-LIABILITIES>                         $123,870
<BONDS>                                             $0
<PREFERRED-MANDATORY>                               $0
<PREFERRED>                                         $0
<COMMON>                                          $470
<OTHER-SE>                                    $466,960
<TOTAL-LIABILITY-AND-EQUITY>                $1,083,039
<SALES>                                       $208,345
<TOTAL-REVENUES>                              $208,345
<CGS>                                         $134,886
<TOTAL-COSTS>                                 $172,101
<OTHER-EXPENSES>                                    $0
<LOSS-PROVISION>                                    $0
<INTEREST-EXPENSE>                              $2,472
<INCOME-PRETAX>                                $34,585
<INCOME-TAX>                                   $11,413
<INCOME-CONTINUING>                            $23,172
<DISCONTINUED>                                      $0
<EXTRAORDINARY>                                     $0
<CHANGES>                                           $0
<NET-INCOME>                                   $23,172
<EPS-PRIMARY>                                    $0.49
<EPS-DILUTED>                                    $0.49