<TABLE> <S> <C>

<PAGE>

<ARTICLE> 5
<LEGEND> This schedule contains summary financial information extracted from
the condensed consolidated balance sheet as of September 30, 2000 and
consolidated statement of income for the nine months then ended and is qualified
in its entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                         DEC-31-2000
<PERIOD-START>                            JAN-01-2000
<PERIOD-END>                              SEP-30-2000
<CASH>                                          2,394
<SECURITIES>                                        0
<RECEIVABLES>                                 101,942
<ALLOWANCES>                                        0
<INVENTORY>                                    57,824
<CURRENT-ASSETS>                              176,340
<PP&E>                                        610,932
<DEPRECIATION>                                412,417
<TOTAL-ASSETS>                                412,690
<CURRENT-LIABILITIES>                          95,698
<BONDS>                                             0
                               0
                                    19,318
<COMMON>                                        9,789
<OTHER-SE>                                    128,964
<TOTAL-LIABILITY-AND-EQUITY>                  412,690
<SALES>                                       506,001
<TOTAL-REVENUES>                              506,001
<CGS>                                         419,213
<TOTAL-COSTS>                                 472,284
<OTHER-EXPENSES>                                    0
<LOSS-PROVISION>                                    0
<INTEREST-EXPENSE>                              6,336
<INCOME-PRETAX>                                27,851
<INCOME-TAX>                                   10,722
<INCOME-CONTINUING>                                 0
<DISCONTINUED>                                      0
<EXTRAORDINARY>                                     0
<CHANGES>                                           0
<NET-INCOME>                                   17,129
<EPS-BASIC>                                      1.76
<EPS-DILUTED>                                    1.67


</TABLE>



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