<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S UNAUDITED FINANCIAL STATEMENTS AS OF AND FOR THE PERIOD ENDING JUNE
30, 2000, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS

<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-END>                               JUN-30-2000
<CASH>                                           4,439
<SECURITIES>                                         0
<RECEIVABLES>                                   92,147
<ALLOWANCES>                                         0
<INVENTORY>                                     18,357
<CURRENT-ASSETS>                               138,837
<PP&E>                                         377,927
<DEPRECIATION>                                 189,627
<TOTAL-ASSETS>                                 373,166
<CURRENT-LIABILITIES>                          107,153
<BONDS>                                        102,898
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        17,874
<OTHER-SE>                                     118,335
<TOTAL-LIABILITY-AND-EQUITY>                   373,166
<SALES>                                        283,137
<TOTAL-REVENUES>                               283,137
<CGS>                                          251,205
<TOTAL-COSTS>                                  259,048
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               4,526
<INCOME-PRETAX>                                 19,222
<INCOME-TAX>                                     6,728
<INCOME-CONTINUING>                             12,494
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    12,494
<EPS-BASIC>                                       0.70
<EPS-DILUTED>                                     0.70