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<S>                             <C>
<PERIOD-TYPE>                   9-MOS
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<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                          13,094
<SECURITIES>                                         0
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<PP&E>                                         307,101
<DEPRECIATION>                                 121,868
<TOTAL-ASSETS>                                 406,368
<CURRENT-LIABILITIES>                           53,526
<BONDS>                                            254
<PREFERRED-MANDATORY>                                0
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<COMMON>                                        20,316
<OTHER-SE>                                     294,913
<TOTAL-LIABILITY-AND-EQUITY>                   406,368
<SALES>                                        271,923
<TOTAL-REVENUES>                               277,201
<CGS>                                          195,558
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<OTHER-EXPENSES>                                 4,463
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<INCOME-TAX>                                    13,669
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<DISCONTINUED>                                   (512)
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
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<EPS-PRIMARY>                                     1.11
<EPS-DILUTED>                                     1.09
        

</TABLE>
