<ARTICLE>          5
<LEGEND>           THIS SCHEDULE CONTAINS SUMMARY FINANCIAL
                   INFORMATION EXTRACTED FROM THE 
                   COMPANY'S UNAUDITED FINANCIAL STATEMENTS
                   AS OF AND FOR THE PERIOD ENDING MARCH 31, 
                   1997, AND IS QUALIFIED IN ITS ENTIRETY BY 
                   REFERENCE TO SUCH FINANCIAL STATEMENTS 
<MULTIPLIER>       1,000
<FISCAL-YEAR-END>  DEC-31-1997
<PERIOD-END>       MAR-31-1997
<PERIOD-TYPE>      3-MOS


<CASH>                                                  21,120
<SECURITIES>                                                 0
<RECEIVABLES>                                           47,078
<ALLOWANCES>                                                 0
<INVENTORY>                                             13,187
<CURRENT-ASSETS>                                        91,675
<PP&E>                                                 282,966
<DEPRECIATION>                                         130,560
<TOTAL-ASSETS>                                         246,014
<CURRENT-LIABILITIES>                                   43,159
<BONDS>                                                      0
<COMMON>                                                18,133
<PREFERRED-MANDATORY>                                        0
<PREFERRED>                                                  0
<OTHER-SE>                                             100,411
<TOTAL-LIABILITY-AND-EQUITY>                           246,014
<SALES>                                                105,874
<TOTAL-REVENUES>                                       106,293
<CGS>                                                   95,058
<TOTAL-COSTS>                                            3,032
<OTHER-EXPENSES>                                             0
<LOSS-PROVISION>                                             0
<INTEREST-EXPENSE>                                       1,293
<INCOME-PRETAX>                                          6,910
<INCOME-TAX>                                             2,523
<INCOME-CONTINUING>                                      4,387
<DISCONTINUED>                                               0
<EXTRAORDINARY>                                              0
<CHANGES>                                                    0
<NET-INCOME>                                             4,387
<EPS-PRIMARY>                                             0.24
<EPS-DILUTED>                                             0.24