<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,
                    1999, AND IS QUALIFIED IN ITS ENTIRETY BY
                    REFERENCE TO SUCH FINANCIAL STATEMENTS
</LEGEND>
<MULTIPLIER>                     1,000
<FISCAL-YEAR-END>          DEC-31-1999
<PERIOD-END>               JUN-30-1999
<PERIOD-TYPE>              6-MOS

<CASH>                                         3,724
<SECURITIES>                                       0
<RECEIVABLES>                                 81,394
<ALLOWANCES>                                       0
<INVENTORY>                                   17,847
<CURRENT-ASSETS>                             119,045
<PP&E>                                       343,467
<DEPRECIATION>                               169,108
<TOTAL-ASSETS>                               345,075
<CURRENT-LIABILITIES>                         90,670
<BONDS>                                            0
<COMMON>                                      18,038
<PREFERRED-MANDATORY>                              0
<PREFERRED>                                        0
<OTHER-SE>                                   110,547
<TOTAL-LIABILITY-AND-EQUITY>                 345,075
<SALES>                                      272,501
<TOTAL-REVENUES>                             272,392
<CGS>                                        242,000
<TOTAL-COSTS>                                  6,549
<OTHER-EXPENSES>                                   0
<LOSS-PROVISION>                                   0
<INTEREST-EXPENSE>                             4,316
<INCOME-PRETAX>                               19,527
<INCOME-TAX>                                   6,835
<INCOME-CONTINUING>                           12,692
<DISCONTINUED>                                     0
<EXTRAORDINARY>                                    0
<CHANGES>                                          0
<NET-INCOME>                                  12,692
<EPS-BASIC>                                   0.70
<EPS-DILUTED>                                   0.70