<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,
                    1996, AND IS QUALIFIED IN ITS ENTIRETY BY 
                    REFERENCE TO SUCH FINANCIAL STATEMENTS 
<MULTIPLIER>        1,000
<FISCAL-YEAR-END>   DEC-31-1996
<PERIOD-END>        JUN-30-1996
<PERIOD-TYPE>       6-MOS


<CASH>                               16,779
<SECURITIES>                              0
<RECEIVABLES>                        54,740
<ALLOWANCES>                              0
<INVENTORY>                          10,852
<CURRENT-ASSETS>                     89,881
<PP&E>                              262,652
<DEPRECIATION>                      116,786
<TOTAL-ASSETS>                      238,503
<CURRENT-LIABILITIES>                41,175
<BONDS>                                   0
<COMMON>                             18,075
<PREFERRED-MANDATORY>                     0
<PREFERRED>                               0
<OTHER-SE>                           93,781
<TOTAL-LIABILITY-AND-EQUITY>        238,503
<SALES>                             211,470
<TOTAL-REVENUES>                    211,629
<CGS>                               186,821
<TOTAL-COSTS>                         6,199
<OTHER-EXPENSES>                          0
<LOSS-PROVISION>                          0
<INTEREST-EXPENSE>                    2,724
<INCOME-PRETAX>                      15,885
<INCOME-TAX>                          5,957
<INCOME-CONTINUING>                   9,928
<DISCONTINUED>                            0
<EXTRAORDINARY>                           0
<CHANGES>                                 0
<NET-INCOME>                          9,928
<EPS-PRIMARY>                          0.55
<EPS-DILUTED>                          0.55