<ARTICLE>          5
<LEGEND>           THIS SCHEDULE CONTAINS SUMMARY FINANCIAL
                   INFORMATION EXTRACTED FROM THE COMPANY'S 
                   UNAUDITED FINANCIAL STATEMENTS AS OF AND 
                   FOR THE PERIOD ENDING SEPTEMBER 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>       SEP-30-1996
<PERIOD-TYPE>      9-MOS


<CASH>                          20,973
<SECURITIES>                         0
<RECEIVABLES>                   50,584
<ALLOWANCES>                         0
<INVENTORY>                     11,072
<CURRENT-ASSETS>                89,598
<PP&E>                         267,457
<DEPRECIATION>                 121,336
<TOTAL-ASSETS>                 238,712
<CURRENT-LIABILITIES>           40,927
<BONDS>                              0
<COMMON>                        18,074
<PREFERRED-MANDATORY>                0
<PREFERRED>                          0
<OTHER-SE>                      95,582
<TOTAL-LIABILITY-AND-EQUITY>   238,712
<SALES>                        309,698
<TOTAL-REVENUES>               310,549
<CGS>                          276,130
<TOTAL-COSTS>                    9,358
<OTHER-EXPENSES>                     0
<LOSS-PROVISION>                     0
<INTEREST-EXPENSE>               4,045
<INCOME-PRETAX>                 21,016
<INCOME-TAX>                     7,645
<INCOME-CONTINUING>             13,371
<DISCONTINUED>                       0
<EXTRAORDINARY>                      0
<CHANGES>                            0
<NET-INCOME>                    13,371
<EPS-PRIMARY>                     0.74
<EPS-DILUTED>                     0.74