
<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-END>                               SEP-30-1995
<CASH>                                           1,215
<SECURITIES>                                         0
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<ALLOWANCES>                                   (5,403)
<INVENTORY>                                      7,281
<CURRENT-ASSETS>                                87,185
<PP&E>                                         707,546
<DEPRECIATION>                               (276,683)
<TOTAL-ASSETS>                                 598,361
<CURRENT-LIABILITIES>                           58,635
<BONDS>                                         84,374
<COMMON>                                        23,166
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                     336,758
<TOTAL-LIABILITY-AND-EQUITY>                   598,361
<SALES>                                        267,108
<TOTAL-REVENUES>                               273,863
<CGS>                                          233,358
<TOTAL-COSTS>                                  233,358
<OTHER-EXPENSES>                                 1,752
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<INTEREST-EXPENSE>                               1,829
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<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     5,338
<EPS-PRIMARY>                                      .23
<EPS-DILUTED>                                        0
        

</TABLE>
