
<TABLE> <S> <C>

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<S>                             <C>
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<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                           7,766
<SECURITIES>                                         0
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<PP&E>                                         323,541
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<TOTAL-ASSETS>                                 433,097
<CURRENT-LIABILITIES>                           67,230
<BONDS>                                          3,941
<COMMON>                                        20,031
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                     301,666
<TOTAL-LIABILITY-AND-EQUITY>                   433,097
<SALES>                                        288,818
<TOTAL-REVENUES>                               307,108
<CGS>                                          206,946
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<OTHER-EXPENSES>                                 7,829
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<INTEREST-EXPENSE>                                 283
<INCOME-PRETAX>                                 58,348
<INCOME-TAX>                                    23,050
<INCOME-CONTINUING>                             37,795
<DISCONTINUED>                                   1,103
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    38,898
<EPS-BASIC>                                       1.91
<EPS-DILUTED>                                     1.86



</TABLE>
