<ARTICLE>                     5
<LEGEND>
    This schedule  contains  summary  financial  information  extracted from the
    financial  statements  included in the Company's Form 10-Q for the quarterly
    period  ended June 30, 2000 and is qualified in its entirety by reference to
    such financial information.



<MULTIPLIER>                                   1,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-2000
<PERIOD-START>                                 JAN-01-2000
<PERIOD-END>                                   JUN-30-2000
<CASH>                                         37,300
<SECURITIES>                                        0
<RECEIVABLES>                                  69,800
<ALLOWANCES>                                        0
<INVENTORY>                                    43,700
<CURRENT-ASSETS>                               27,300
<PP&E>                                        500,500
<DEPRECIATION>                                267,400
<TOTAL-ASSETS>                                555,800
<CURRENT-LIABILITIES>                          86,600
<BONDS>                                       172,600
<PREFERRED-MANDATORY>                               0
<PREFERRED>                                         0
<COMMON>                                        4,300
<OTHER-SE>                                    219,200
<TOTAL-LIABILITY-AND-EQUITY>                  555,800
<SALES>                                       220,400
<TOTAL-REVENUES>                              220,400
<CGS>                                         164,000
<TOTAL-COSTS>                                 164,000
<OTHER-EXPENSES>                                    0
<LOSS-PROVISION>                                    0
<INTEREST-EXPENSE>                              6,400
<INCOME-PRETAX>                                15,200
<INCOME-TAX>                                    5,700
<INCOME-CONTINUING>                            10,100
<DISCONTINUED>                                      0
<EXTRAORDINARY>                                     0
<CHANGES>                                           0
<NET-INCOME>                                   10,100
<EPS-BASIC>                                       .70
<EPS-DILUTED>                                     .70