WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

  


<ARTICLE>                     5
<CIK>                         0000898904
<MULTIPLIER>                                  1000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                              DEC-31-1996
<PERIOD-END>                                   SEP-30-1996
<CASH>                                         72,802
<SECURITIES>                                   0
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<ALLOWANCES>                                   1,182
<INVENTORY>                                    14,457
<CURRENT-ASSETS>                               145,502
<PP&E>                                         443,975
<DEPRECIATION>                                 197,934
<TOTAL-ASSETS>                                 403,625
<CURRENT-LIABILITIES>                          160,808
<BONDS>                                        0
<PREFERRED-MANDATORY>                          0
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<COMMON>                                       38,309
<OTHER-SE>                                     31,157
<TOTAL-LIABILITY-AND-EQUITY>                   403,625
<SALES>                                        602,228
<TOTAL-REVENUES>                               602,208
<CGS>                                          0
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<OTHER-EXPENSES>                               731
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<INCOME-PRETAX>                                (18,645)
<INCOME-TAX>                                   (6,080)
<INCOME-CONTINUING>                            (12,565)
<DISCONTINUED>                                 0
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<CHANGES>                                      0
<NET-INCOME>                                   (12,565)
<EPS-PRIMARY>                                  (1.08)
<EPS-DILUTED>                                  (1.08)